The name of the invention: lining type butterfly valve
Technical field

[0001]
　The present invention relates to a lining type butterfly valve resin-lined to the valve body and the valve box internal peripheral surface, in particular, relates to a butterfly valve having improved sealing characteristics near the shaft seal portion of the vertical side and the valve stem of the valve body.
Background technique

[0002]
　Conventionally, and when passing a chemical industrial plant highly corrosive fluids used in the, as a butterfly valve for use in food-related flow path, the metal core of the valve body is coated with a resin lining layer, resin seat ring is mounted on the inner peripheral surface of the valve box, the butterfly valve of so-called lining structure is known. The lining type butterfly valve, the valve body lining layer and the resin sheet ring is formed of a resin material such as PTFE or PFA, except these materials for not touch the fluid, severe corrosion fluid, such as chlorine gas or hydrochloric acid, etc. chemical fluid, chemical, food, are suitable as solvents.
[0003]
　In this type of lining type butterfly valve, in order to prevent external leakage of the fluid from the top and bottom side and valve rod near the shaft seal portion of the valve body, a plurality of sealing structure is provided in stages near the. Seal structure of vertical side is called a vertical seal, is provided as a primary seal. The top and bottom seals, the resin sheet ring attached to the inner periphery of the valve boxes, of the valve body vertical, or upper, respectively the peripheral surface of the lower side of the valve stem insertion hole is sealed by pressing from the upstream side to the downstream side with passing leakage fluid is prevented, the fluid leakage from around the valve stem connected to the valve body is prevented by the position of the most the valve body side.
　Seal structure of the shaft sealing part of the valve stem, so called shaft seal, the axial direction of the outer position of the valve stem than the primary seal of a butterfly valve, is provided as a secondary seal to the valve stem and concentric. The shaft seal, with a fluid leakage from around the valve stem is prevented, fluid leakage from between the valve body and the resin sheet ring (so-called back leakage) is prevented.
　Furthermore, in the axial direction of the outer position of the valve stem than the secondary seal, there is the seal member such as O-ring is disposed as a tertiary seal, which fluid leakage is further prevented from around the valve stem by .
[0004]
　As such a plurality of seal structure is provided, for example, a butterfly valve of Patent Documents 1 and 2 is disclosed. In Patent Document 1, is held by the supporting resin sheet ring is provided on the inner peripheral side, the diameter of the valve body is larger than the resin sheet ring. Thus, top and bottom sealing functions resin sheet ring is compressed, whereas, by a sealing member ring-shaped member is stopped by a washer held by a shoulder formed in the body bore, the shaft by ring-shaped member seal is adapted to function.
　In Patent Document 2, as top and bottom seals function by a cushion provided between the body and the resin sheet ring, to function shaft sealing by clamping device provided on the secondary side in the axial direction of the vertical seal site going on.
　Thus, in these valves, a vertical seal is the primary seal, secondary seal of the first shaft seal to the valve stem is are provided with independent structure, vertical seal and the shaft by respective sealing part and the seal is provided.
[0005]
　On the other hand, in the butterfly valve of Patent Documents 3 to 5, a vertical sealing, pressing force is provided the use structure by the spring.
　The butterfly valve of Patent Document 3, a cylindrical plug the spring is Tamahatsu the boss portion side, thereby circumferential seal is a primary seal between the resin sheet ring and the valve body is subjected, the cylindrical plug and the resin shaft seal is provided as a secondary seal by the O-ring provided between the seat ring.
　The butterfly valve of Patent Document 4, the pressing ring by belleville spring is pressed by the pressed sealing ring by the pressing ring, and the top and bottom seal and the shaft seal are configured to function.
　In Patent Document 5, the elastic member is a sealing member via the pressed bearing member is pressed in the axial direction, so as to function the circumferential seal and the shaft seal by the elastic body by a spring.
[0006]
　Further, the butterfly valve 1 shown in FIG. 9 as a comparative example, the resin lining layer 3 is coated disk-shaped valve body 4 is provided in the core body 2 made of metal, the inner peripheral surface of the valve box 9 resin seat ring 5 is mounted. Further, the resin lining layer 3, is extended axially along the valve stem 6 which is mounted on the valve body 4 is formed a valve rod cladding portion 7, the resin sheet ring on the outer peripheral surface of the valve stem covering section 7 5 There by extension covering portions 8 which extend along the valve rod 6 is arranged, is trying to ensure the sealing property.
[0007]
　Incidentally, in the butterfly valve, when the applied fluid pressure from the primary side in the valve closed state, it is known that the valve body is moved slightly to the secondary side by the fluid pressure. For example, in the butterfly valve of nominal diameter 100A, if the pressure of 1.0MPa is applied from the primary side in the valve closed state, the valve body is moved about 0.2mm on the secondary side.
CITATION

Patent Document

[0008]
Patent Document 1: JP Laid-Open Publication No. 52-90815
Patent Document 2: JP Patent No. 3863563
Patent Document 3: JP Laid-Open Publication No. 61-119881
Patent Document 4: JP Mika Publication No. Sho 58-56463
Patent Document 5: Patent First No. 2,920,364 Bulletin
Summary of the Invention

Problems that the Invention is to Solve

[0009]
　In butterfly valves in Patent Documents 1 and 2, provided in a state where the top and bottom seal and the shaft seal both independent of the spring, the diameter of the valve body in Patent Document 1 is greater than the resin sheet ring inner diameter, Patent Document 2 in the cushion provided between the body and the resin sheet ring, so that the top and bottom seals each functions. Since such a structure, when the sealing property was reduced by deterioration due to a temperature change and aging of the lining resin, to recover a vertical seal by utilizing the elastic force of the spring against the sealing property decreases can not. Thus, it is difficult to maintain the top and bottom sealing property and the shaft sealing property.
[0010]
　On the other hand, in the butterfly valve of Patent Document 3-5, the top and bottom seals utilizing springs, although recovery of circumferential sealing by the elastic force of the spring while possible is a, each have the following problems.
　Butterfly valve of Patent Document 3 is a structure using an O-ring secondary seal, in case of using a rubber-based material as the O-ring can not be used as a corrosive fluid such as chlorine. Therefore, the secondary seal can not be secured, leading to the valve application is limited.
　The butterfly valve in Patent Document 4, the tapered surface pressing force of the disc spring is provided on the retaining ring and the seal ring, because it is a component force in the vertical seal and axial seal direction, of either side seals if strong force becomes weak sealing of the other side, it is impossible to increase the sealing force of both effectively. Moreover, adjustment to maintain the these vertical seal and the shaft seal balance may require, and the adjustment difficult.
　Also in Patent Document 5, since the pressing force of the spring by using the tapered surface of the elastic member is a component force in the primary seal and the secondary seal, it has the same problem as Patent Document 4.
[0011]
　Further, in the butterfly valve 1 of Figure 9 shown as a comparative example and Patent Documents 1-5, for example, applied fluid pressure from the primary side to the butterfly valve 1 is fully closed in the state of FIG. 9, the valve as shown in FIG. when the body 4 is moved to the secondary side, the resin lining layer 3 is also moved to the secondary side. In this case, poor these adhesion circumferential side of the resin lining layer 3 is shifted to the secondary side of the resin sheet ring 5, top and bottom of the valve body 4 made by these resin lining layer 3 and the resin sheet ring 5 sealing of the valve box 9 in the valve rod 6 near the side, i.e., reduces the circumferential sealing property, there is a risk of causing the so-called primary leakage.
　Further, by the valve rod 6 with the movement of the valve element 4 in FIG. 9 is moved to the secondary side, also deteriorates adhesion between the valve stem cover portion 7 and the extension cover portion 8, these valve rod cladding portion 7 sealing of the valve rod 6 and the valve body 9 made by the extension covering portion 8 and, that reduces the axial sealing of the valve rod 6, fear is caused a so-called secondary leakage.
[0012]
　The present invention has been developed to solve the conventional problems, and has as its object a lining type butterfly valve having a corrosion resistance to the fluid, improved the vertical sealing property and the shaft sealing property at the same time leakage reliably prevented, even when disuccinimidyl is moved to the secondary side by the fluid pressure, it is to provide a butterfly valve capable of maintaining these sealability.
Means for Solving the Problems

[0013]
　To achieve the above object, the present invention is a disuccinimidyl coated with lining portion within cylindrical body covered with a sheet liner a butterfly valve provided openably through the stem, the axis of the stem according to claim 1 by sandwiching the seal portion between the ring member and the stem is prevented to diameter of the shaft seal section, disuccinimidyl the circumferential boss through the ring body by the resilient force of the spring provided on JikuSo portion of the body a lining type butterfly valve which holds the sealing of the top and bottom seal portion by pressing the sheet liner positioned on the surface.
[0014]
　The invention according to claim 2, vertical seal site is lined type butterfly valve which is adapted to press strongly outer periphery position of the seal boss face the circumferential disuccinimidyl.
[0015]
　The invention according to claim 3, the ring member is a lining type butterfly valve presses the sheet liner through the annular flange portion of the sealing bushing on the shaft sealing part.
[0016]
　The invention according to claim 4, the bottom surface of the annular flange portion, a lining type butterfly valve provided with a tapered surface inclined downward toward the outer diameter.
[0017]
　The invention according to claim 5, provided with a thick sealing portion on the inner periphery of the tubular lining portion which is extended in the sheet liner, the outer periphery of the barrel lining portion that extends the thickness sealing portion lining portion of disuccinimidyl it is pressed lining type butterfly valve.
[0018]
　The invention according to claim 6 is a lining type butterfly valve formed cross section chevron-shaped tapered surface portion in the thick seal portion.
[0019]
　Invention, by interposing a cylindrical portion formed on the sealing bush between the cylindrical lining portion and the ring member, lining type that prevents enlarged diameter of the tubular lining portion through the cylindrical portion by a ring body according to claim 7 it is a butterfly valve.
[0020]
　The invention according to claim 8 is a sliding lining type butterfly valve in contact with the tubular lining portion of the O-ring seat liner with interpolation of the cylindrical portion of the sealing bushing.
[0021]
　The invention according to claim 9 is a lining type butterfly valve formed with a stem and disuccinimidyl separately.
[0022]
　The invention according to claim 10, when the flow path opening and the flange portion of the short cylindrical body covered with a sheet liner, and fully closed disuccinimidyl stem in fluid pressure is slightly moved to the secondary side, the sheet liner is lined type butterfly valve provided in the edge position of the flow path portion side of the flange portion moving space movable to follow.
[0023]
　The invention according to claim 11, lining unit is composed of a boss surface coated with the boss portion of the upper and lower disuccinimidyl the barrel lining portion coated on the outer periphery of the stem from the boss surface and the seat liner, the flange portion while extending the tubular lining portion for sealing connection with the sealing surface from the sealing surface on the outer periphery of the barrel lining portion to the flow path portion connecting extended to the boss surface and the seal above and below, to the secondary side of disuccinimidyl the movement of the channel portion of the seat liner by moving space to follow the movement, to maintain the top and bottom seals between the boss surface and the sealing surface, the sealing of the shaft seal with barrel lining portion and the cylindrical lining portion a lining type butterfly valve you.
[0024]
　The invention according to claim 12, the mobile space is lined type butterfly valve is a tapered surface which is formed by cutting the edge portion of the flow path opening of the body on the end face side of the body.
[0025]
　The invention according to claim 13, moving space is lined type butterfly valve is stepped portion surface formed by cutting the edge portion of the flow path opening of the body to the stepped portion shape.
[0026]
　The invention according to claim 14, moving space is lined type butterfly valve is tapered taper space provided on the connecting portion of the flow path portion and the flange end of the sheet liner.
Effect of the Invention

[0027]
　According to the invention of claim 1, the tubular body covered with a sheet liner having a corrosion resistance to the fluid by the disuccinimidyl coated with lining portion, top and bottom of disuccinimidyl through the ring body by the resilient force of the spring by holding the sealing of the top and bottom sealing part to press the sheet liner located boss face, to improve the vertical sealing property is primary seal, and at the same time, the shaft seal portion of the stem and the ring member sandwiched between the stem by which to prevent enlarged diameter of the shaft sealing portion, thereby improving the axial sealing properties. In this case, it is with these vertical sealability and axial sealing properties adversely affect each other without holding both reliably prevented leakage. Moreover, since it shared to ensure the shaft seal of the circumferential sealing properties of the ring member, which contributes to be simplified internal structure to suppress the increase in the number of parts. Since holding the top and bottom sealing property by using the elastic force of the spring, it can be recovered sealability even when the resin is a lining material is deteriorated due to a temperature change or aging. During assembly, it is possible to improve the vertical sealing property and the shaft sealing property by mounting the ring member to a predetermined sealing force, there is no need to adjust each sealing force, it is easy incorporation of the ring member.
[0028]
　According to the invention of claim 2, by pressing strongly vicinity of the outer circumference of the seal boss face the circumferential disuccinimidyl to reduce the sliding resistance of the contact portion between the seal boss face and the seat liner, the opening and closing torque of the valve while preventing an increase can improve vertical sealing property, moreover, the top and bottom sealing property can be maintained by using a spring.
[0029]
　According to the invention of claim 3, by transmitting the pressing force of the spring to the seat liner from the ring member via the annular flange portion, unlike the case where a metal ring body is pressed against the resin sheet liner sheet directly preventing local deformation of the liner to maintain the top and bottom sealing property while preventing breakage of the sheet liner.
[0030]
　According to the invention of claim 4, ensuring the vertical sealability presses reliably strong outer periphery of the seal boss face the circumferential disuccinimidyl by the tapered surface.
[0031]
　According to the invention of claim 5, by pressing the thick seal portion of the resin tubular lining portion on the outer periphery of the barrel lining portion of the resin, increase the opening and closing torque of the reduction to the valve frictional resistance the shaft seal can be ensured while suppressing.
[0032]
　According to the invention of claim 6, tends to disperse the stress caused by the pressing of the barrel lining portion than the cross section chevron-shaped tapered surface portion, the creep phenomenon to suppress local deformation of the thick seal portion can be reduced . Thus, reliably to prevent leakage while maintaining the shaft seal property.
[0033]
　According to the invention of claim 7, and capable of maintaining axial sealing property by pressing the tubular lining portion by utilizing the elastic force of the cylindrical part of the sealing bush on the outer periphery of the barrel lining portion.
[0034]
　According to the invention of claim 8, shared while adopting the vertical seal structure using a spring, since the availability of sealing bushing used in the top and bottom seal diameter prevention tertiary sealing part by O-ring, a sealing bushing parts while achieving reduction, it can maintain the shaft sealing properties by increasing the tertiary sealing property.
[0035]
　According to the invention of claim 9, the disuccinimidyl lined after incorporation into the cylindrical body covered with a sheet liner, can ensure the sealing of the shaft seal portion only by inserting the stem into disuccinimidyl. Therefore, facilitates the entire assembly work, it can be secured and vertical sealing property and the shaft sealing properties while also allows compact disuccinimidyl by another embody stem.
[0036]
　According to the invention according to claim 10, even when disuccinimidyl is moved to the secondary side by the fluid pressure in the valve closed, the seat liner is movable to follow through the movement space, between the sheet liner and the lining portion maintaining vertical sealing property to prevent primary leakage between, and the ability to maintain the axial sealing property to prevent secondary leakage can be reliably closed highly corrosive fluids, chemical fluids, such as chlorine gas, a fluid such as a chemical solution . Moreover, since it is only providing the moving space of the seat liner excellent in workability and formability, sheet liners and lining unit, and can be manufactured while suppressing the complication of the body shape. The sheet liner, because it can ensure a thickness of disuccinimidyl lining, the permeation resistance of the fluid can be maintained.
[0037]
　According to the invention of claim 11, by the flow path of the sheet liner is moved by the movement space to follow the movement of the secondary side of disuccinimidyl, boss surface to move the secondary side with disuccinimidyl, barrel lining against part, the sealing surface, the sealing state to follow the tubular lining portion can be maintained. Thus, maintaining the top and bottom sealing property between prevented by body and disuccinimidyl primary leakage between the boss surface and the sealing surface, and the body to prevent secondary leakage between the barrel lining portion and the cylindrical lining portion fluid leakage can be securely prevented by maintaining the shaft seal with the disuccinimidyl.
[0038]
　According to the invention according to claim 12, deformable can without constraining the flow path of the sheet liner, smoothly deformed along a flow path portion to the tapered surface when the disuccinimidyl the stem is moved to the secondary side It is not able to follow the sheet liner, stress concentration at the contact portion between the body of the seat liner can be prevented. Because it easily form the moving space in the body by the tapered surface, the moldability is not necessary to perform the processing on the sheet liner is improved, moreover, resistance to permeation of the fluid such as chlorine there is no need to reduce the thickness of the sheet liner sex can be maintained.
[0039]
　According to the invention of claim 13, by a simple process without requiring high accuracy in the body side can form a step portion surface, secondary and disuccinimidyl and stem the flow path of the sheet liner through the step portion surface it can be reliably deformed so as to follow the side movement. Thus, formability since it is not necessary to perform processing on the sheet liner often, moreover, the permeation resistance of the fluid such as chlorine there is no need to reduce the thickness of the sheet liner can be maintained.
[0040]
　According to the invention of claim 14, it is possible to provide a simultaneous tapering space and molding of no sheet liner applying processing to the body, it is possible to suppress an increase in working steps for forming a tapered space. Through the tapered space it can be reliably deformed so as to follow the flow path of the sheet liner on the secondary side movement between disuccinimidyl and stem.
BRIEF DESCRIPTION OF THE DRAWINGS

[0041]
FIG. 1 is a central longitudinal cross-sectional view of an embodiment of a lining type butterfly valve of the present invention.
It is a [2] central longitudinal cross-sectional view of the lining type butterfly valve of FIG.
FIG. 3 is an enlarged fragmentary cross-sectional view of FIG.
4 is a partially enlarged sectional view showing the vicinity of thick seal portion.
5 is a partially enlarged sectional view showing the vicinity of the sealing bushing.
[6] disuccinimidyl in FIG. 3 is an enlarged cross-sectional view illustrating a state that has moved to the secondary side.
7 is an enlarged sectional view showing a second embodiment of a lining type butterfly valve of the present invention.
8 is an enlarged sectional view showing a third embodiment of the lining type butterfly valve of the present invention.
9 is an enlarged cross-sectional view illustrating a conventional rose fly valve.
DESCRIPTION OF SYMBOLS

[0042]
　10 the valve body
　11 body
　12 disuccinimidyl
　13 stem
　15 passage opening
　16 flange portion
　18 the shaft sealing part
　19 vertical seal site
　20 sheet liner
　22 ring body
　23 sealing bushing
　23a cylindrical portion
　23b annular flange portion
　24 O-ring
　26 tapered surface
　27 JikuSobu
　30 channel portion
　31 sealing surface
　32 lining portion
　33 barrel lining portion
　34 tubular lining portion
　36 boss
　37 the boss surface
　40 tapered surface (moving
　space) 42 thick sealing portion
　43 tapered surface portion
　44 spring
　51 step portion surface (moving space)
　61 tapered space (space for movement)
DESCRIPTION OF THE INVENTION

[0043]
　It will be described below in detail with reference to the drawings An embodiment of the lining type butterfly valve of the present invention. 1 and 2 shows an embodiment of a butterfly valve of the present invention, FIG. 3 shows an enlarged fragmentary cross-sectional view of FIG.
[0044]
　1, FIG. 2, the butterfly valve (hereinafter, referred to as the valve body 10) is used, for example, chemical industrial plant and food related conduits such as cylindrical shape of the body 11, disuccinimidyl 12, upper stem 13a and has a stem 13 including the lower stem 13b, is provided by the diameter of the nominal diameter 100A. As will be described later, the valve body 1, the tubular lining portion 34 of the sheet liner 20, barrel lining portion 33 of the lining portion 32, a shaft seal portion 18 having a sealing bushing 23, the boss surface 37 of the lining portion 32, a sheet vertical seal portion 19 having a sealing surface 31 of the liner 20 is provided.
[0045]
　Body 11, for example by cast iron, such as ductile cast iron is formed into a tubular, the upper body 11a, has a lower body 11b, it is removably secured by bolts 14. The body 11 is provided with passage openings 15 and the flange portion 16, it is covered with a sheet liner 20. Upper body 11a, JikuSo portion 27 having a JikuSoana 21 to JikuSo side of the stem 13 of the lower body 11b are mounted on the JikuSobu 27, upper stem 13a, the lower stem 13b is mounted, respectively. The mounting side of disuccinimidyl 12 JikuSobu 27, the ring member 22, a sealing bushing 23, O-ring 24, the bearing 25 is mounted, spring 44 including coil springs Following these are provided.
[0046]
　The seat liner 20 made of a resin material, in this embodiment, PFA by (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) fluororesin such as, for example, provided in a thickness of approximately 3 mm, whereby high corrosion resistance and heat It has become capable of exhibiting the sex. In sheet liner 20, the passage unit 30 which is movable in the passage direction is formed in the flow path port 15 side, further the flow path portion 30 so as to be extended from the flange portion 16, the seal on the inner peripheral side surface 31 is provided, the peripheral seal can be connected to the tubular lining portion 34 of the barrel lining 33 to be described later from the seal surface 31, it extends in the axial direction of the upper and lower JikuSoana 21.
[0047]
　3 and 4, the tubular lining portion 34 consists of the cylindrical portion, which extends integrally to the side of inserting the stem 13 of the sheet liner 20, wall thickness on the inner periphery of the tubular lining portion 34 annularly sealing portion 42 is formed.
[0048]
　Thick seal portion 42 is projected to the outer periphery of the barrel lining portion 33 can press size. The thick seal portion 42 is a cross-sectional mountain shape of the tapered surface portion 43 is formed, the taper angle of the tapered surface portion 43 is set in a range of, for example, 8 ° ~ 15 °. Thick seal portion 42, the outer periphery of the barrel lining portion 33 while abutting, is pressed against by the outer diameter side of the shaft tube lining portion 33 when the stem 13 is inserted into the barrel lining portion 33 in close contact shaft seal condition of the shaft sealing part 18 is obtained by.
[0049]
　1 to 3, disuccinimidyl 12, the stem 13 is formed separately, is provided rotatably in the body 11 through the stem 13. Metal core 35 is provided on the center side of disuccinimidyl 12, the metal core 35 is, for example, a disk shape stainless steel alloy as a material, the surface of the wetted surface of the metal core 35, when the body 11 lining portion 32 by the resin material of the fluorine resin such as PFA like the can, for example, it is coated with a thickness of 3 mm.
[0050]
　Lining unit 32, a boss surface 37 coated with a stem insertion hole 12a boss 36 formed on the peripheral surface of which is formed above and below the disuccinimidyl 12 in vertical side of disuccinimidyl 12, the outer periphery of the stem 13 from the boss surface 37 coating capable and a barrel lining portion 33 of the barrel portion of the extended by a shaft seal side, the front and back surfaces of the metal core 35 through the through hole 35a formed at an appropriate position of the core metal 35 by being coated integrally on the outer periphery, withdrawal from the metal core 35 is prevented.
[0051]
　Square hole 38 is formed in the vertical side of the stem insertion hole 12a of disuccinimidyl 12, upper stem 13a from the square hole 38, the connection side of the lower stem 13b is fitted inserts, the upper stem 13a, the lower stem 13b through it, disuccinimidyl 12 lining portion 32 is coated, the sheet liner 20 is JikuSo rotatably to the body 11 coated. By being thus provided a stem 13 and disuccinimidyl 12 to separate from the structure, it is easy to assemble.
[0052]
　The outer periphery of the stem 13 of JikuSoana 21 cylindrical bearing 25 is provided between the sheet liner 20 located and the bearing 25 downward, a metal cylindrical ring body 22 is sandwiched between the It is provided so as to be.
[0053]
　Ring body 22, it is provided by the available diameter for pressing strongly outer periphery position of the top-and-bottom seal boss face 37 of disuccinimidyl 12 stainless material from the upper side, with disuccinimidyl 12 is rotatable state through bearings 25 the elastic force of the spring 44 of Figure 1 is provided to be able to transmit.
[0054]
　1, the JikuSoana 21 of the upper body 11a is arranged in a state where the bearing member 70 is engaged with the retaining ring 71, the spring 44 is supported on Tamahatsu ready downward by the bearing member 70 that. On the other hand, the JikuSoana 21 of the lower body 11b is arranged in a state where the frame member 72 is locked by the retaining ring 71, the bearing member 73 is overlaid on the frame member 72, via the bearing member 73 spring 44 is supported on Tamahatsu ready upward. These bearing members 70 and 73, the frame member 72, upper and lower spring 44, 44 is issued bullet in disuccinimidyl 12 directions. The inner periphery of the bearing member 70 and frame member 72, O-ring 74, 75 for dust and water are respectively mounted.
[0055]
　Bearing 25 is disposed between the spring 44 and the ring member 22 of JikuSoana 21, upper stem 13a by the bearing 25 in the vicinity of the lower stem 13b, respectively tertiary seal (near the O-ring 24), rotatable It is and supported in aligning state. Bearing 25 is on the inner periphery of the metal bearing bushes 25a of stainless steel, back metal with the resin multilayer bearing 25b is provided on the two-layer structure is mounted.
[0056]
　Bearing bush 25a is provided on the outer diameter spring 44 whose spring force is applied in contact with, the end face side when the elastic force is applied abuts the ring member 22, pressing the ring member 22 disuccinimidyl 12 side to be able to be provided. In this case, disuccinimidyl 12 side end surface of the bearing bush 25a may be in contact to the end face of the sealing bush 23, it is not necessary to apply a pressing force to the sealing bush 23 from the bearing bushing 25a.
[0057]
　In the present embodiment, between the upper surface of the lower surface and the sealing bush 23 of the bearing bushes 25a, is provided with a small gap (not shown), the sealing bush 23 is arranged so as not to be pressed by the bearing 25 . Incidentally, without passing through the bearing 25 may have a structure for pressing the ring body 22 directly by the spring 44.
[0058]
　Sealing bushing 23 is made of flanged member, molded by a resin material such as carbon fiber filled PTFE (polytetrafluoroethylene), sealing site between the ring member 22 and the lining 32 and the seat liner 20 JikuSoana 21 It is provided as. 3, the cylindrical portion 23a is formed in the sealing bushing 23, the lower portion side of the cylindrical portion 23a, a flange portion 23b formed of an annular flange portion is formed so as to be bent in the outer circumferential direction. The flange portion 23b contacts the end face 22a of the ring member 22 is brought, whereby the ring body 22 is configured to press the sheet liner 20 via a flange portion 23b.
[0059]
　According to this structure, the severe use such valves, any chance, by sealing of the top and bottom sealing part 19 and the shaft seal portion 18 is decreased, even if the fluid intrudes between the seat liner 20 and the sealing bush 23 since the flange portion 23b of the resin sealing bush 23 is pushed strongly resin sheet liner 20 by the ring member 22, to prevent leakage of the pressed portion is so-called back leakage. Therefore, it is possible to metal ring body 22 without contacting the corrosive fluid, presses the sheet liner 20 through the ring member 22 by increasing the elastic force of the spring 44, recovers a vertical seal.
[0060]
　Here, as shown in FIG. 5, the bottom surface of the flange portion 23b, a tapered surface 26 inclined downward toward the outer diameter is provided by the angle theta, thereby, the sealing bush 23 of FIG. 3 in the sheet liner 20 when mounted, around the outer diameter position of the flange bottom may be in contact with the seat liner 20 in FIG.
[0061]
　Although not shown, when the fluid is not corrosive forms an annular flange portion of the ring body 22 so that the lower side thereof is bent toward the inner periphery of the ring member 22, directly sheet liner 20 in ring body 22 it may be used a pressing structures. In this case, the sealing bushing 23, a flange portion 23b is not required, the cylindrical portion 23a may be arranged above the annular flange portion of the ring member 22.
[0062]
　Tubular lining portion 34 and the sealing bush 23 as the cylindrical portion 23a is interposed between the ring member 22 is mounted, diameter of the tubular lining portion 34 via the cylindrical portion 23a is prevented by the ring 22 that.
[0063]
　With such a configuration, the valve body 10 shown in FIG. 1, a position in the circumferential boss surface 37 of disuccinimidyl 12 via the ring member 22 a spring 44 provided in the JikuSo portion 27 of the body 11 by the elastic force by pressing the sheet liner 20 to retain the sealing property of the top and bottom sealing part 19 is a primary seal.
[0064]
　At the same time, by sandwiching the tubular lining portion 34, barrel lining portion 33 of the stem 13, the shaft seal portion 18 having a sealing bushing 23 between the ring 22 and the stem 13, the enlarged diameter of the shaft sealing part 18 preventing, shaft seal portion 18 is these sliding portion serves as a secondary seal.
[0065]
　Further, in FIG. 3, than the cylindrical portion 23a of the sealing bushing 23 in the upper part is provided holding portions 23c, O-ring 24 is inserted into the holding portion 23c. Thus, O-ring 24 above the shaft seal portion 18 (secondary seal) is mounted, in sliding contact with the O-ring 24 within the barrel lining portion 33, these drive barrel lining portion 33 (upper stem 13a, the lower stem 13b) and sliding portion by the O-ring 24 serves as a tertiary seal. Holding portion 23c is provided at a height capable of forming a gap X between the cylindrical lining portion 34.
　In FIG. 3, are shown near the top side of disuccinimidyl 12 in valve body 10, it is provided in the same structure as the upper side of the lower side of disuccinimidyl 12.
[0066]
　In the above embodiments, are provided by stainless steel ring member 22, may be provided by any other metal material, or, the outer periphery of the ring body 22 side (disuccinimidyl 12 when pressed by the bearing 25 near) strongly pressing possible, it may be a material other than metal material.
[0067]
　Further, although using a coil spring as a spring 44, not limited to this, for example, it may be used disc spring as a spring.
[0068]
　Subsequently, it describes the assembly procedure of the valve body. When assembling the valve body 1 is intended to assemble the upper and lower side as well.
　1 and 2, first, the disuccinimidyl 12 coated with the lining portion 32, incorporated in the inside of the sheet liner 20. At that time, each of the interpolated top and bottom of the barrel lining 33 of disuccinimidyl 12 to the tubular lining portion 34 of the seat liner 20.
[0069]
　Then, attaching the sealing bush 23 fitted with O-ring 24 to the holding section 23c on the outer periphery of the tubular lining portion 34. At this time as fitting the flange portion 23b on the outer peripheral side of the tubular lining portion 34, incorporated so as to abut the O-ring 24 of the upper side in the barrel lining portion 33 periphery in FIG.
[0070]
　The outer circumference of the sealing bush 23, mounting the ring member 22 while so as to abut against the bottom surface to the flange portion 23b top surface. Thus, the metal ring 22 holds the cylindrical portion 23a and the holding portion 23c of the sealing bush 23 from the outer peripheral side, enlarged thick seal portion 42 of the tubular lining portion 34 is prevented.
[0071]
　Upper stem 13a in this state, by inserting the lower stem 13b on the inside of the barrel lining portion 33 respectively connected to the stem insertion hole 12a. Thus, joined by a predetermined pressing force in the radial direction in the thick seal portion 42, the secondary seal and tertiary seal is able to function.
[0072]
　On the other hand, the upper body 11a, each JikuSoana 21 of the lower body 11b, the bearing 25, spring 44, bearing members 70 and 73, fitted with a piece member 72 at corresponding positions, respectively, bearing member 70, the frame member 72 respectively to prevent escape by the locking of the retaining ring 71.
[0073]
　Finally, the upper body 11a, disuccinimidyl 12 between the lower body 11b, a sealing bushing 23, arranged above the sheet liner 20 fitted with the ring member 22, and integrated by tightening the bolts 14 in a state sandwiched this, assembly of the valve body 10 is completed.
[0074]
　6, the valve body 10 after assembly, when the applied fluid pressure from the primary side in the fully closed is a disuccinimidyl 12 and the stem 13 in the fluid pressure is slightly moved to the secondary side, for example, 1 when the fluid pressure in .0MPa is applied is disuccinimidyl 12 moves approximately 0.2mm secondary side. The valve body 10, during the movement of such disuccinimidyl 12, moving space 40 which is movable sheet liner 20 is to follow, as shown in FIG. 3, the channel portion 30 side of the edge of the flange portion 16 It is provided on the part position.
[0075]
　By the movement of the flow path portion 30 of the sheet liner 20 that follow by the moving space 40 to move to the secondary side of disuccinimidyl 12, and top and bottom seals of the boss surface 37 and sealing surface 31, barrel lining portion 33 and the tubular sealing of the shaft seal of the lining 34 is adapted to be maintained.
[0076]
　Moving space 40, the edges of the channel opening 15 of the body 11 is provided by the cut on the end face side has all been tapered surface formed by the body 11, capable of a range of the moving space 40 the flow path portion 30 is deformed going on. Therefore, the tapered surface 40 may be maintained and vertical seal and the shaft seal channel portion 30 is moved to the secondary side to follow the disuccinimidyl 12, the maximum movement distance of lateral movement dimension disuccinimidyl 12 in FIG. 3 It is disposed in a predetermined angle such that. In this embodiment, the fluid pressure of 1.0MPa, as described above, the moving space 40 which disuccinimidyl moves laterally maximum width 0.2 mm, provided at an angle that can be secured between the body 11 and the sheet liner 20 It is. If the lateral movement dimension of 30 of the channel portion is too large, aware that it may negatively impact the sealing of the valve blade side of disuccinimidyl 12 the flow path portion 30 is excessively moved is required.
[0077]
　Furthermore, it is also possible to adjust the angle of the tapered surface 40 to set the amount of movement of the flow path portion 30, the valve body 10 applied different diameters and fluid pressure by finely adjusting a very small amount of movement amount set the amount of movement of the flow path unit 30, and a vertical sealing property and the shaft sealing property can be maintained in accordance with the.
[0078]
　Tapered surface 40 is formed along the flow path opening 15 of the body 11, the inner diameter of the gasket 41 to an outer diameter shown in FIG. 3 which is disposed at the connection portion between the external pipe (not shown) connected to the valve body 10 It is set to equal to or less than that. This prevents the tapered surface 40 approaches the seal surface 41a of the gasket 41 in the through channel direction, receives the flange part the effect of the sheet liner 20 even when the fluid pressure applied to the sealing surface 41a of the gasket 41 because there is not deformed, it can maintain a seal with the external pipe due to the gasket 41.
[0079]
　In this case, the upstream side to the right side in FIG. 2, although the left and downstream, when a valve body 1 of the symmetrical structure as shown in the figure, the left upstream may right as a downstream side.
　Moving space 40 described above is not necessarily formed to the body 11, it may be formed in the sheet liner 20. Thus, the moving space 40, either one of the sheet liner 20 or body 11, or may be provided on both, further, the moving space 40 in each case in various shapes other than the tapered surface It can also be provided.
[0080]
　Next, the operation in the embodiment of the lining type butterfly valve of the present invention.
　3, in the valve body (nominal size 100A) 10 fully closed, by pressing the sheet liner 20 located in the vertical boss surface 37 of disuccinimidyl 12 via the ring member 22 by the resilient force of the spring 44 , by vertical sealing part 19 having a boss surface 37 and the sealing surface 31 can hold the top and bottom sealing property is primary seal, if degradation occurs in the sheet liner 20 and lining unit 32, the resilient spring 44 the sealing property can be restored by force.
[0081]
　In this case, the elastic force of the spring 44 is transmitted as a pressing force to the outer peripheral side of the top and bottom sealing side of the boss surface 37 of disuccinimidyl 12 via the ring member 22. Therefore, while suppressing the increase in the operating torque, to be able to intensively close contact with the boss face 37 and the sealing surface 31, it is possible to obtain a sealing of a given vertical seal.
[0082]
　By sandwiching it is to prevent the diameter of the shaft sealing part 18 between the shaft seal portion 18 and the ring member 22 and the stem 13, a secondary seal without adversely affecting the top and bottom sealing property, barrel shaft seal due the lining part 33 and the tubular lining portion 34 can be ensured. Thus, vertical sealing properties, without reducing either the sealability of the shaft sealing property can be improved both sealability, it becomes possible to suppress increase in the number of components.
[0083]
　Corrosion sealing surface 31 and the tubular lining portion 34, the boss 37 and the barrel lining portion 33 of the lining portion 32 of the sheet liner 20, since it is integrally molded by a resin, respectively, superior to corrosive fluids such as chlorine to maintain.
[0084]
　To explain the sealability of each sealing part More specifically, in the vertical seal portion 19, the ring member 22 arranged concentrically on the outer circumference of the upper stem 13a and a lower stem 13b is, by the elastic force of the spring 44 seat the liner 20 is pressed to maintain the sealing property. At that time, the top and bottom sealing part 19, that is to press strongly outer periphery position of the circumferential boss surface 37 of disuccinimidyl 12, disuccinimidyl 12 and the seat liner 20 in comparison with the case of pressing the entire boss surface 37 while reducing the sliding resistance between to maintain the primary sealing properties, prevents the increase of the opening and closing torque of the valve.
[0085]
　Moreover, the sealing bush 23 provided in the shaft seal portion 18, that presses the sheet liner 20 via the flange portion 23b of the sealing bush 23, the end face 22a of the ring member 22 presses the sheet liner 20 directly without resin sealing bush 23 becomes to press, the pressing force from the ring member 22 to prevent stress concentration to transmit to disperse the sheet retainer 20 side via the flange portion 23b. Therefore, the metal ring member 22 in comparison with the case of directly pressed, thereby preventing local deformation of the sheet liner 20.
[0086]
　Furthermore, these contact sites by strongly pressing the flange portion 23b and the seat liner by a ring member 22 also functions as a seal portion, the pressed portion serves as a site to prevent leakage called back leakage described above.
[0087]
　Here, as shown in FIG. 5, the tapered surface 26 of the angle θ on the bottom surface of the flange portion 23b provided so as to ramp down, the outer periphery of disuccinimidyl 12 more intensively by the outer diameter side of the tapered surface 26 by strongly pressed annular, it is possible to increase the vertical sealing property more.
[0088]
　On the other hand, in the shaft seal portion 18, the outer periphery of the tubular lining portion 34 and the barrel lining 33 and is in sliding contact with a wall thickness sealing portion 42 of the inner periphery of the tubular lining portion 34 at this time barrel lining portion 33 are the works by pressing the. This makes it possible to obtain a locally high sealing property, prevent leakage between the tubular lining portion 34 and the barrel lining 33. Thick seal portion 42, since the tubular lining portion 34 is a resin formed integrally, these secondary seal is a sliding contact between the resins. Therefore, the joint use of such a small resin material coefficient of friction such as fluororesin as these materials, a resin tubular lining portion 34 as compared with the case of directly pressed into the metallic stem 13, the frictional resistance can be prevented an increase in the opening and closing torque of greatly reduced to the valve.
[0089]
　By the thick seal portion 42 forms a cross section chevron-shaped tapered surface portion 43, the boundary portion between the tapered surface portion 43 and the tubular lining portion 34 spreads the foot shape, to the pressing of the barrel lining 33 the stress associated with likely to disperse. While thereby suppressing local deformation of the thick seal portion 43, the creep phenomenon is reduced thereby preventing a reduction in sealability. When mounting the stem 13 in disuccinimidyl 12 can be inserted stem 13 let smoothly climb over the disuccinimidyl 12 relative thick seal portion 42. During manufacture of the sheet liner 20, the thickness seal portion 42 is projected inward of the tubular lining portion 34, contact it does not become an obstacle to the removal of the mold by cross chevron-shaped tapered surface portion 43.
[0090]
　Sandwiching the shaft sealing portion 18 as described above, in order to maintain the sealing of the secondary seal to prevent enlarged diameter of the thick seal portion 42 in the ring member 22, the ring member 22 as in this embodiment it may be arranged to a position facing the thick seal portion 42. In the present embodiment, in FIG. 4, the height of disuccinimidyl end 42a of the thick seal portion 42 is set so as to substantially coincide the height and of the end face 22a of the ring member 22.
[0091]
　The cylindrical portion 23a is interposed between the tubular lining portion 34 and the ring member 22, by which through the cylindrical portion 23a to prevent the diameter of the tubular lining portion 34 by the ring member 22, the thickness seal portion 42 pressed securely to the barrel lining portion 33, further elasticity of the plastic of the cylindrical portion 23a is improved further axial sealing performance by utilizing.
[0092]
　In the tertiary seal side, by slidably contacts the O-ring 24 with interpolation of the cylindrical portion 23a of the sealing bush 23 to the tubular lining portion 34 of the sheet liner 20, the O-ring 24 upper stem 13a, the lower stem 13b outer periphery is sliding by a predetermined pressing force to ensure the sealing performance can be prevented tertiary leakage from around the stem 13. Further, the holding portion 23c and utilizes also the ring body 22 in the expanded prevention holding portion 23c by being furnished to the ring member 22, it is possible to further improve the axial sealing property while achieving sharing of components.
[0093]
　Moreover, the tertiary sealing function around the stem 13 of the O-ring 24, even when disuccinimidyl 12 in fluid pressure moves the secondary side, can be prevented tertiary leakage around the stem, while sharing parts by sealing bush 23 , while preventing stress concentration, to exert the tertiary sealing function.
[0094]
　3, relative to the valve body (nominal size 100A) 10 fully closed, when the fluid pressure of 1.0MPa is applied from the primary side (right side in the figure), disuccinimidyl 12 and the stem 13 is about 0.2mm two slightly moves to the next side (left side in the figure).
[0095]
　Here, the sheet liner 20, the outer periphery of the with the sealing surface 31 constitutes a vertical seal to seal the boss surface 37 coated with a boss portion 36 of disuccinimidyl 12, the tubular lining portion 34 of the sheet liner 20 has a stem 13 since constitute a shaft seal to seal the barrel lining portion 33 coated with, the channel portion 30 of the sheet liner 20, with the movement to the secondary side of disuccinimidyl 12 and stem 13, the sealing surface with 31 and the tubular lining portion 34 moving force is applied to the secondary side.
[0096]
　At that time, since the moving space 40 is provided having a width of 0.2mm to advance the flange portion 16 the passage section 15 side of the edge position of the body 11, the channel portion 30 of the sheet liner 20, FIG. as shown in 6, it can be modified within the scope of the moving space 40 (maximum width 0.2 mm), 0.2 mm move to the secondary side to follow the movement of the secondary side of disuccinimidyl 12 and stem 13 can do.
[0097]
　Therefore, each of the top and bottom seals according the boss surface 37 and sealing surface 31, the tubular lining portion 34 and the barrel lining portion 33 which is formed in the direction perpendicular to the flow path portion 30 of the seat liner 20 and by the shaft seal the sealing performance can be maintained. This can prevent secondary leakage of the primary leakage and shaft seal side of the vertical seal side.
[0098]
　Moreover, by providing the moving space by the flow path opening 15 tapered surface 40 of the edge portion is formed by cutting the end face of the body 11 of the body 11, the flow path portion 30 of the sheet liner 20 while preventing stress concentration since it is possible to move, it is possible to suppress the consumption of the sheet liner 20.
[0099]
　Further, by wearing the O-ring 24 on the inner periphery of the cylindrical portion 23a of the flanged member 23, it can be prevented tertiary leakage between the flanged member 23 and the shaft tube lining portion 33.
[0100]
　Next, in FIG. 7 shows a second embodiment of a lining type butterfly valve of the present invention. In the following this embodiment, the embodiment and the same parts are represented by the same reference numerals, and description thereof is omitted.
　In the valve body 50 in this embodiment, the edge of the channel opening 15 of the body 11 is circumferential stepped portion surface 51 is notched in the stepped portion shape is formed by the step portion surface 51 sheet liner 20 movable moving space is provided follow to.
　In this case, since it is possible to form the step portion surface 51 so as to cut out the flange portion 16 of the body 11 side at a predetermined depth can be formed by simple machining without requiring high precision the step portion surface 51 . At that time, by shallow as possible stepped portion surface 51, the stress concentration of the sheet liner 20 near the boundary of the step portion surface 51 it can be avoided.
[0101]
　8 shows a third embodiment of the lining type butterfly valve of the present invention. In the valve body 60 of this embodiment, the flow path portion 30 and the taper tapered space 61 in the connection portion between the flange end of the sheet liner 20 is formed so as to cut out, the tapered space 61 is a space for movement ing.
　In this case, at a time when formed into a sheet liner 20 side without performing machining the body 11 can form a tapered space 61, more preferably, by forming a tapered space 61 so as to contact the sheet liner 20 to the body 11 , it becomes possible to suppress the influence on the permeation resistance of the fluid.
The scope of the claims

[Claim 1]
　The disuccinimidyl coated with lining portion within cylindrical body covered with a sheet liner a butterfly valve provided openably through the stem, by sandwiching the shaft seal portion of the stem between the ring member and the stem thereby preventing the diameter of the shaft sealing part, by pressing the sheet liner positioned in the vertical boss surface of the disuccinimidyl by the resilient force of the spring via the ring member provided on JikuSo portion of said body lining type butterfly valve, characterized in that retaining the sealing of the top and bottom sealing part.
[Claim 2]
　The vertical seal site lining type butterfly valve according to claim 1 which is adapted to press strongly outer periphery position of the seal boss face the circumferential of the disuccinimidyl.
[Claim 3]
　It said ring body, lining type butterfly valve according to claim 1 or 2 to press the sheet liner through the annular flange portion of the sealing bushing provided on the shaft sealing portion.
[Claim 4]
　Wherein the bottom surface of the annular flange portion, lining type butterfly valve according to claim 3 having a tapered surface inclined downward toward the outer diameter.
[Claim 5]
　Wherein providing the thick seal portion on the inner periphery of the tubular lining portion which is extended in the sheet liner, claims 1 to 4 presses the thick seal portion on the outer periphery of the barrel lining portion which is extended in the lining of disuccinimidyl any lining type butterfly valve according to one of.
[Claim 6]
　Lining Butterfly valve according to claim 5 formed cross section chevron-shaped tapered surface portion in the thick seal portion.
[Claim 7]
　The cylindrical portion formed on the sealing bush is interposed between the ring member and the tubular lining portion, the ring according to claim 5 or through the cylindrical portion to prevent enlarged diameter of the tubular lining portion by body lining type butterfly valve according to 6.
[8.]
　The lining type butterfly valve according to interpolated O-ring on the cylindrical part of the sealing bush to any one of claims 3 to 7 in sliding contact with the cylindrical lining portion of the sheet liner.
[Claim 9]
　Lining Butterfly valve according to any one of claims 1 to 8 were formed with the said stem disuccinimidyl separately.
[Claim 10]
　When a flow path opening and the flange portion of the body of the short tubular covered with the seat liner, said stem and said disuccinimidyl in fully closed fluid pressure is slightly moved to the secondary side, said sheet liner follow lining butterfly valve according to the movement space movable to any one of claims 1 to 9 provided on the edge position of the flow path portion side of the flange portion by.
[Claim 11]
　The lining portion is made from the boss surface coated with the upper and lower boss portions of the disuccinimidyl and barrel lining portion coated on the outer periphery of the stem from the boss surface and the seat liner, the flow path from the flange portion parts and extends the well as extending the tubular lining portion for sealing connection to the outer periphery of the barrel lining part from the sealing surface and the boss surface and the sealing surface for sealing connection to the vertical, to the secondary side of the disuccinimidyl the movement of the channel portion of the seat liner by the moving space to follow the movement of the top and bottom seals of the boss surface and the sealing surface, the sealing of the shaft seal with the barrel lining part and the cylindrical lining portion lining butterfly valve according to claim 10 which is adapted to maintain.
[Claim 12]
　The moving space is lined Butterfly valve according to claim 10 or 11 is a tapered surface which is formed by cutting the edge portion of the flow path opening of the body on the end face side of the body.
[Claim 13]
　The moving space is lined Butterfly valve according to claim 10 or 11, which is a stepped portion surface formed by cutting the edge portion of the flow path opening of the body to the stepped portion shape.
[Claim 14]
　The moving space is lined Butterfly valve according to claim 10 or 11 wherein a tapered tapered space provided on the connecting portion of the flow path portion and the flange end of the sheet liner.