FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13) LIQUID TAKE-OFF VALVE
KOSAN INDUSTRIES PVT. LTD.
an Indian Company
of 64/65, Laxmi Insurance Building, Sir P.M. Road, Fort,
Mumbai 400001, Maharashtra, India
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

Field of the Invention:
The present invention generally relates to methods and apparatus for regulating the flow of gases, liquids, fluidized solids and the like, more particularly., the present invention relates to a valve for regulating the flow of Liquid Petroleum Gas (LPG) from a cylinder or a small tank.
Background of the Invention:
A valve is an apparatus that regulates the flow of gases, liquids, fluidized solids, and the like, by opening closing, or partially obstructing various passageways. The valve may be used in industries, households, automobiles, and the like. The valve may be operated manually or may have automatic operation. Manual operation of the valve may be either by a hand wheel, a lever, or a pedal. The automatic valves may be driven by changes in pressure, temperature, flow, or the like. The valves may be categorized into following basic types, such as, a ball valve, a butterfly valve, a choke valve, a check valve, a diaphragm valve, a gate valve, a globe valve, a knife valve, a needle valve, a piston valve, a pinch valve, a plug valve, a spool valve, a poppet valve, andthe like.
Further, some valves useful for regulating the flow of Liquid Petroleum Gas have been disclosed in the prior arts.
For example, US patent number 3,865,137 issued on February 11, 1975 discloses a regulator valve useful in connection with portable cylinders of LPG gas. The regulator valve comprises a valve body, a gas inlet, a flow

regulating means, a tire valve downstream of said flow regulator means, a chamber comprising a diaphragm, an air inlet to bias against said diaphragm on the opposite side of said diaphragm, and a gas exit. A unitary housing is provided for said air inlet and said gas outlet.
Although, the conventional valves are useful for regulating the flow of Liquid Petroleum Gas, these conventional valves have numerous limitations. For example, these conventional valves are non-repairable. Further, the conventional valves have high operational cost. Furthermore, the conventional valves have less operating life.
Accordingly, there is a need of a liquid take-off valve that is repairable. Further, there is a need of a liquid take-off valve that has a relatively low operating cost. Furthermore, there is a need of a liquid take-off valve that has long operating life. Moreover, there is a need of a liquid take-off valve that is easy to use.
Objects of the Invention
A primary object of the present invention is to provide a liquid take-off valve that is modular in construction.
Another object of the present invention is to provide a liquid take-off valve that is repairable.
Still another object of the present invention is to provide a liquid take-off valve that has a relatively low operating cost.

Yet another object of the present invention is to provide a liquid take-off valve that has long operating life.
Another object of the present invention is to provide a liquid take-off valve that is easy to use.
Yet another object of the present invention is to provide a liquid take-off valve that is easy to assemble and dissemble.
Summary of the Invention:
A liquid take-off valve for regulating the flow of a fluid from a fluid storage cylinder is disclosed. The liquid take-off valve includes valve housing, an excess flow device, a safety relief device, a hand wheel and an adaptor. The valve housing accommodates critical components of the liquid take-off valve. The excess flow device is adapted to prevent excess flow of fluid through the liquid take-off valve. The excess flow device is removably connected to an operative bottom of the valve housing and is removable there-from for accessing an interior of the liquid take-off valve. The safety relief device is removably connected to a side of the valve housing and is removable there-from for accessing the interior of the liquid take-off valve. Similarly, the hand wheel is removably connected to an operative top of the valve housing and is removable there-from for accessing the interior of the liquid take-off valve. The adaptor is removably connected to the valve housing and is removable there-from for accessing the interior of the liquid take-off valve.

Typically, the excess flow device is threadably connected to the operative bottom of the valve housing.
Preferably, the safety relief device is threadably connected to the side of the valve housing.
Still further, the hand wheel is threadably connected to the side of the valve housing.
Generally, the valve housing is configured from hot pressed brass material.
Particularly, the hand-wheel is made from brass material.
Further, the excess flow device is also made from brass material.
Specifically, the tightening torque required for fitting the excess flow device to the valve housing is in the range of 3 76.3 Nm to 216.9 Nm.
Generally, for a flow rate of 9 liters per minute, the differential pressure across said liquid take-off valve is 0.75 Kgf/cm2 .
Brief Description of the Accompanying Drawings:
The invention will now be explained in relation to the accompanying drawings, in which:

Figure 1 illustrates a sectional view of a liquid take-off valve, in accordance with one embodiment of the present invention;
Figure 2 illustrates a graph depicting variation of the Differential pressure across the liquid take-off valve v/s flow rate, for the liquid take-off valve of Figure 1; and
Figure 3 illustrates a graph depicting variation of the Pressure with the flow rate of LPG, for the excess flow valve of Figure 1.
Detailed Description of the Accompanying Drawings:
The invention will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
Referring to Figures 1 of the accompanying drawings, a liquid take-off valve 100 for regulating the flow of Liquid Petroleum Gas (LPG) from a cylinder or a small tank is depicted. The liquid take-off valve 100 may be adapted to withdraw Liquid Petroleum Gas from the cylinder or the small tank for domestic use. The liquid take-off valve 100 includes a valve housing 102, a pair of O-rings 104, a spindle seat 106, a lower spindle 108, a pair of lock pins 110, a hand wheel 112, a safety packing 114, a safety packing holder 116, a safety spring 118, a safety adjustment screw 120, an adapter 122, a valve seat 124, a screw 126 for the adapter 122, a spring 128 for the adapter 122, a first O-ring 130, a spindle 132 for the adapter 122, a second O-ring 134, a washer 136, an Excess Flow Device (EFD) body 138, an EFD block

140, a spring 142 for the EFD, a screw 144 for the EFD, a tube 146 for liquid, a third O-ring 148, and a safety guard 150. The valve housing 102 having a first side 152, a second side 154, a top side 156, and a bottom side 158.
The EFD body 138, the EFD block 140, the spring 142, and the screw 144 may be adapted to form the excess flow device 200 or excess flow check valve 200. The Excess Flow device 200 is adapted to be disposed on the inlet portion of the liquid take-off valve 100. More specifically, the EFD body 138 of the excess flow device 200 is adapted to be threadably connected to the bottom side 158 of the valve housing 102. Accordingly, the excess flow device 200 may be removed from the bottom side 158 of the valve housing 102 for facilitating the access of the interior parts of the liquid take-off valve 100 to the user for various purposes, such as repairing, cleaning, and replacement. In other words, the excess flow device 200 may be removed from the valve housing 102 for removing, replacing or repairing various interior parts of the liquid take-off valve 100 as and when required. Additionally, the excess flow device 200 may be removed from the valve housing 102 for enabling repairing or replacement of the valve housing 102, as and when required. The excess flow device 200 may be adapted to prevent excess flowing of the LPG through the liquid take-off valve 100.
Further, the safety packing 114, the safety packing holder 116, the safety spring 118, the safety adjustment screw 120, and the safety guard 150 may be adapted to form a safety relief device 300 or a safety relief valve 300. In one embodiment of the present invention, the safety relief device 300 or the safety relief valve 300 may be removably connected to the first side 152 of

the valve housing 102. Accordingly, the safety relief device 300 may be removed from the valve housing 102 for enabling repairing or replacement of the safety relief device 300 as and when required. Additionally, removal of the safety relief device 300 from the first side 152 of the valve housing 102 facilitates the access of the interior parts of the liquid take-off valve 100 to the user for various purposes, such as repairing, cleaning, and replacement. In other words, the safety relief device 300 may be removed from the valve housing 102 for removing, replacing or repairing various interior parts of the liquid take-off valve 100, as and when required. Furthermore, the liquid take-off valve 100 includes an outlet connection having poppet closing arrangement for filling as well as withdrawal of the Liquid Petroleum Gas. In one embodiment of the present invention, the outlet connection is in the form of 1.1/4" - 5 ACME 2.9 RH external thread. The liquid take-off valve 100 may be opened and closed manually by means of the hand wheel 112. Manual actuation of the hand wheel 112 may facilitate movement of the lower spindle 108 for enabling opened and closed position of the liquid take-off valve 100.
In one embodiment of the present invention, the hand wheel 112 may be removably connected to the top side 156 of the valve housing 102 by means of a threaded connection. Accordingly, the hand wheel 112 may be repaired or replaced as and when required by the user. Additionally, removal of the hand wheel 112 from the top side 156 of the valve housing 102 facilitates the access of the interior parts of the liquid take-off valve 100 to the user for various purposes, such as repairing, cleaning, and replacement. In other words, the hand wheel 112 may be removed from the valve housing 102 for

removing, replacing or repairing various interior parts of the liquid take-off valve 100, as and when required.
The valve housing 102 may be of a hot pressed brass material. The pair of O-rings 104 may be of nitrile rubber. The spindle seat 106 may be of nylon 66 material. The lower spindle 108, the pair of lock pins 110, and the hand-wheel 112 may be of brass material. The safety packing 114 may be of nitrile rubber. The safety packing holder 116 may be of brass material. The safety spring 118 may be of rust proof spring wire material. The safety adjustment screw 120 and the adapter 122 may be of brass material.
The valve seat 124 may be of nitrile rubber. The screw 126 for the adapter 122 may be of nitrile rubber. The spring 128 for the adapter 122 may be of rust proof spring wire material. The first O-ring 130, the second O-ring 134, the washer 136, and the third O-ring 148 may be of nitrile rubber material. The spindle 132, the Excess Flow Device (EFD) body 138, the EFD block 140, and the screw 144 for EFD may be of brass material. The spring 142 for EFD may be of rust proof spring wire. The tube 146 for liquid may be of a material selected from a group consisting of delrin, copper, and stainless steel. The safety guard 150 may be of plastic material.
Although, in the present embodiment of the present invention, various parts of the liquid take-off valve 100 are described with respect to a particular material the present invention is not limited to any particular material used for manufacturing any part of the liquid take-off valve 100. Accordingly, the various parts of the liquid take-off valve 100 may be of various other materials known in the art.

In one embodiment of the present invention, the adapter 122 needs to be rotated in anti-clock wise direction for fitting the adapter 122 to the valve housing 102. Similarly, the adapter 122 may be removed from the valve housing 102 by clock- wise rotation of the adapter 122 with respect to the valve housing 102. Accordingly, the adapter 122 is removably connected to the valve housing 102 for enabling repairing or replacement of the adapter 122, as and when required. More specifically, the adapter 122 may be removed from the valve housing 102 for facilitating the access of the interior parts of the liquid take-off valve 100 to the user for various purposes, such as repairing, cleaning, and replacement. In other words, the adapter 122 may be removed from the valve housing 102 for removing, replacing or repairing various interior parts, such as the washer 136, of the liquid take-off valve 100, as and when required by the user.
In another embodiment of the present invention, the tightening torque required for fitting the excess flow device 200 to an inlet portion of the valve housing 102 may be in the range of 176.3 Nm to 216. 9 N-m. In other words, the tightening torque required for fitting the excess flow device to the valve housing 102 may be in the range of 130 to 160 lbs ft. Further, in yet another embodiment of the present invention, configuration of the inlet threads of the valve housing 102 are as per at least one of the IS: 8737 and IS: 3224 standards. As per IS: 8737, 3/4" x l4 NGT, 1:16 taper of ANSI B57 - 1 -1965. As per CL. 3.2.1 of IS: 3224, Type 1 Size 2 and other oversizes, 3/4"x l4 NGT, 3/4" x l4 NGT CL-1, 3/4"xl4 NGT CL-2, 3/4" x l4 NGT CL-3, and 3/4"x l4 NGT CL- 4. As per Type 4 of IS: 3224, 25.40mm and 31.75mm. As per Type - 2, nominal size 28.8 of IS: 3224.

Now referring to Figure 2, a graph depicting variation of the differential pressure across the liquid take-off valve with respect to the flow rate of the LPG is depicted. For the flow rate of 9 L/min, the differential pressure across the liquid take-off valve 100 is 0.75 Kgf/cm2. Further, as the flow rate increases, the differential pressure across the liquid take-off valve 100 increases at a rate higher than the rate at which the LPG flow rate increases. Furthermore, the variation of the differential pressure across the liquid take-off valve with respect to the flow rate of the LPG depicts a curved structure.
Now referring to Figure 3, a graph depicting variation of pressure with respect to the flow rate of LPG, for the excess flow check valve 200, is depicted. For the flow rate of 3.7 L/min, the pressure is 1.5 Kgf/cm2. Further, as the flow rate increases, the pressure increases at a rate higher than the rate at which the LPG flow rate increases. However, the variation of the pressure with respect to the flow rate of the LPG depicts a straight line structure.
TECHNICAL DATA
1. PNEUMATIC TIGHTNESS TEST
(a) Close position at 0.1 and 17 Kgf/cm2 (b)Open position at 0.1 and 17 kgf/cm2
2. HYDROSTATIC TEST AT 25.5 Kgf/cm2
Minimum 1 per batch or as per user's requirement
3. SAFETY RELIEF VALVE
(a) Setting 20 Kgf/cm2

(b) Working pressure - 20±1 Kgf/cm2
(c) Reset pressure 17 Kgf/cm2
(d) Capacity - 5 m3/min
4. EXCESS FLOW CHECK VALVE
(a) Closing flow rate at 7 Kgf/cm2 cylinder pressure - 7.5 +10%-20%
LMP (Liters/Min) of LPG Liquid.
(b) Residual leak after shut off- Max 500 cm /min LPG liquid
5. Filling rate at 12 to 15 Kgf/cm2 - 20 1/min LPG.
Advantages:
The liquid take-off valve of the present invention is repairable, as the various parts of the liquid take-off valve, such as the excess flow device, the adapter and the hand wheel, may be removed from the liquid take-off valve for facilitating the access of the interior parts of the liquid take-off valve to the user for various purposes, such as removing, repairing, cleaning, and replacement. Accordingly, the liquid take-off valve has a relatively low operating cost. Further, the liquid take-off valve has long operating life. Moreover, the liquid take-off valve is easy to use and simple to operate.
Wherever a range of values is specified, a value up to 10% below and above the lowest and highest numerical value respectively, of the specified range, is included within the scope of the invention.

While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We Claim:
1. A liquid take-off valve for regulating the flow of a fluid from a fluid storage cylinder, said liquid take-off valve comprising:
• valve housing for accommodating critical components of said liquid take-off valve;
• an excess flow device adapted to prevent excess flow of fluid through said liquid take-off valve, said excess flow device being removably connected to an operative bottom side of said valve housing and removable there-from for accessing an interior of said liquid take-off valve;
• a safety relief device removably connected to a side of said valve housing and removable there-from for accessing said interior of said liquid take-off valve;
• a hand wheel removably connected to an operative top side of said valve housing and removable there-from for accessing said interior of said liquid take off valve; and
• an adaptor removably connected to said valve housing and removable there-from accessing said interior of said liquid take-off valve.
2. A liquid take-off valve as claimed in claim 1, wherein said excess flow device is threadably connected to said operative bottom of said valve housing.

3. A liquid take-off valve as claimed in claim 1, wherein said safety relief device is threadably connected to said side of said valve housing.
4. A liquid take-off valve as claimed in claim 1, wherein said hand wheel is threadably connected to said side of said valve housing.
5. A liquid take-off valve as claimed in claim 1, wherein said valve housing is configured from hot pressed brass material.
6. A liquid take-off valve as claimed in claim 1, wherein said hand-wheel is made from brass material.
7. A liquid take-off valve as claimed in claim 1, wherein excess flow device is made from brass material.
8. A liquid take-off valve as claimed in claim 1, wherein tightening torque required for fitting said excess flow device to said valve housing is in the range of 176.3 Nm to 216.9 Nm.
9. A liquid take-off valve as claimed in claim 1, wherein for a flow rate of 9 liters per minute, the differential pressure across said liquid take-off valve is 0.75 Kgf/cm2.