FIELD OF INVENTION
The invention broadly relates to flow isolation device often called Valve
which are used for high pressure rating upto and including pressure
rating Class 4500 Special of ASME B16.34. These isolation devices are
mostly used in the drain and vent line of super critical boilers where the
pressure and temperature are higher than the normal boiler line ratings.
The developed flow isolation device can be deployed wherever high
pressure isolation of water/ steam/ oil is required.
BACKGROUND OF INVENTION
Flow isolation devices oftenly called Valves are used for high pressure
isolation, drain or vent service. These devices generally have a shell
encompassing the fluid boundary and Trim portion which helps in
isolation of the medium. One of the applications of such devices is in
area where very high pressure is to be isolated. These devices normally
termed as high pressure valves are used for drain 8J vent application in
Boilers.
Valves for these applications are provided with backseating feature
making the assembly and disassembly cumbersome for those Valve
where the backseat feature is not a required one.
The purpose of the high pressure drain/ vent valve in a Boiler or a
pressure equipment is to isolate the upstream from downstream. Another
embodiment of this equipment with a profiled disc is used for regulating
the flow. These devices are used in high quantities in power/utility
boilers. Some of these valves are used in the warming-up operation of the
line. These devices are also used as bypass valves/ pressure relieving for
equalizing the pressure to reduce the operational force required for the

equipment operation 8B for preventing damage to the pressure containing
equipment.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to propose a high pressure
isolation device for isolation duty at very high pressures.
Another object of the invention is to provide a high pressure isolation
device for serving at high temperatures which has metallic seating
making it durable and long standing in service point of view and where a
softseat Valve cannot be used.
Another object of the invention is to provide a T-pattern device where the
layout constraints experienced in a Y-Pattern device would be overcome.
Another object of the invention is to provide a welded construction
between Body 8B Yoke thereby eliminating the less reliant threaded joint
prone to leakage.
Another object of the invention is to provide a simpler 8B sturdier Valve
for use in high pressure isolation with a unified Stem cum Disk for
closing and without backseating feature enabling easier dismantling and
servicing.
Another object of the invention is to provide a positive sealing device for
isolating the inlet from the outlet in devices for drain, vent, warming line
and similar applications.
SUMMARY OF INVENTION
Accordingly, there is provided a High Pressure Isolating Device with
open/close provision to isolate the inlet and outlet of high pressure fluid
flowing line comprising; a body or shell which encompasses the fluid; the
body having both the inlet and outlet aligned to the piping, an yoke
welded onto the body with full penetration welding; the Seating on Body

being integral with hardfacing of suitable material to withstand the
higher pressure & temperature; the Stem cum Disk portion on Stem with
hardfacing of suitable material acting as Disk, also with suitable power
threading of trapezoidal form for transmission of the required thrust to
close the device against the medium, the stem with sufficient strength
and finish to provide the sealing in the Gland area. The Yoke houses the
Stem Nut of suitable bearing material with threading to match the Stem.
The Tee-Handle is rotated which rotates the Stem cum Disk through the
threading of Stem Nut which transmits thrust to the Seating.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Fig. -1 cross-sectional view of a High Pressure Isolating Device according
to the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
Figure -1 illustrates a High Pressure isolating device of the invention.
The device comprising a body (01) or shell encompassing the fluid, said
body (01) having inlet drilled at specific angle to the inlet piping axis, and
outlet drilled at specific angle to the inlet piping axis to be parallel to the
inlet axis; an yoke (03) welded onto the body (01) by full penetration
weld, at right angle instead of some oblique angle; the Yoke (03) housing
the bottom ears of gland bolting; a Seat (02) integral on body (01) by
means of hardfacing of suitable material; a stem cum disk (04) is
provided, which is made of single rod and having disk portion at bottom
hardfaced with suitable material, the shank of the Stem cum disk (04)
having required surface finish for effective sealing through the packings
(06); the upper portion of the Stem cum Disk (04) provided with power
threading of suitable trapezoildal thread for transmission of required

thrust through the Stem Nut (07). The Stem cum Disk (04) travels
through a prefixed distance effecting full open condition for the fluid flow.
The Stem cum Disk is guided on top to provide sturdiness and to effect
sealing without buckling. A high pressure closing device with Stem cum
Disk (04) and without backseating feature provision making assembly
and disassembly easier. The Stem cum Disk (04) can be opened and
closed several times unlike High Pressure Isolation valve system designed
for single use only. The rotation of Tee-Handle (08) gives rotary motion to
the Stem cum Disk (04) by means of positive pyramid engagement at top
and the thread engagement of Stem Nut (07) provides a helical lift for
Stem cum disk (04) along the thread helix. The seating portion of the
Stem cum disk (04) mates with a matching differential taper seating (02)
in the body (01) made of suitable hardfacing material which isolates the
high pressure of the medium; a gland consisting of set of preformed pure
carbon packing rings (06) which arrests leakage through the gland, a
bridge type gland flange (09) which is used for applying pressure to the
packing (06) through a gland follower (10); at least two numbers of studs
(12) including corresponding nuts (11) for arresting the leakage through
the gland packing (06) in which the studs (12) pass through the hole of
the gland flange (09) including the ear hole in the Yoke (03) and are held
by two nuts (11) on either side which facilitates adjusting of the leakage
by tightening the gland nuts (11).

WE CLAIM
1. A high pressure isolation device comprising :
- a body or shell (01) which encompasses the fluid;
- the body (01) having outlet drilled at a specific angle to the piping
but parallel to that of the inlet;
- a yoke (03) welded onto the body (01) at right angle by full
penetration welding instead of some oblique angle;
- a yoke (03) housing bottom ears of gland bolting;
- the Seat (02) integral on body (01) made of hardfacing of suitable
material on Body (01);
- a Stem cum Disk (04) which has one of an integral seating with
specific angle for a positive seating with lesser thrust on Body seat
(02).
- a Stem cum Disk (04) which travels through a prefixed distance
effecting full open condition for the fluid flow.
- a Stem cum disk as above which is guided on top to provide
sturdiness and to effect sealing without buckling.
- a Stem cum Disk (04) which can be opened and closed several
times unlike High Pressure Isolation Valve System designed for
single use only.
- a high pressure closing device with Stem cum Disk (04) and
without backseating feature provision making assembly and
disassembly easier.
- a Stem cum Disk (04) to Tee handle (08) connection with a desired
taper pyramid ensuring positive engagement of both members
without undesired play.
- A Gland flange (09) with Gland follower (10) for an adjustable leak-
prevention means to arrest leakage of the medium through the
gland.

2. The device as claimed in claim 1, wherein the adjustable leak-
prevention means comprises a set of packing (06), a gland
flange (09) for applying pressure to the packing (06) via a gland
follower (10), and at least two studs with corresponding nuts
(11,12).
3. The device as claimed in claim 1, comprising a seat with a
specific diverging angle of suitable hardfacing material.
4. The device as claimed in claim 1, wherein the stem cum disk
(04) comprises the bottom Disk portion of suitable angle with
specific variance to the Body seat angle to withstand high
pressure.
5. The device as claimed in claim 1, wherein the device is
configured to possess a self alignment to provide necessary
sealing between the Body seating (02) and the Stem (04) cum
Disk.
6. The device as claimed in claim 1, wherein the gland packing
(06) comprises preformed pure carbon packing ring which
arrests leakage through the gland.
7. A High Pressure Isolation Device for isolation purpose as
substantially described and illustrated herein with reference to
the accompanying drawings.

The invention relates to a high pressure isolation valves for drain/ vent/
bypass and other similar applications comprising a body or shell (01)
which encompasses the fluid; the body (01) made out of barstock with an
inlet drilled at specific angle to the inlet piping axis, and an outlet drilled
at specific angle to the inlet piping axis to be parallel to the inlet axis; a
yoke (03) welded onto the body (01) by a full penetration welding; a
Seating (02) comprising of welded Stellite onto the Body (01); the Seating
Angle in the Body Seat (02) and Stem cum Disk (04) seat vary to a
predefined degree to ensure a positive and minimum seating force for
isolation; the preformed pure carbon packing rings (06) ensure the gland
tightness against leakage and also ensure smooth operation; the gland
nut (11) is tightened on the gland stud (12) making the gland follower
(10) to compress on the packings (06) through the gland flange (10)
giving above sealing effect; the Tee-handle (08) rotates the stem (04)
which comes in contact with the Stem Nut (07) for transmitting the
required thrust for isolation of the medium.