Title of Invention

A TESTABLE SWING CHECK VALVE

Abstract ABSTRACT A testable swing check valve comprising a hinge pin, extension shaft with guide, hand wheel, cam, stopper pin, knob, spring keys, end cap, end cover, yoke, stuffing box, proximity (magnetic) sensors for indicating disc position, limit switch for indicating engagement of mechanism with hinge pin, and a magnet for enabling the sensors to sense the disc position.
Full Text

This invention relates to a testable swing check valve.

The swing check valve proposed herein enables manual operation of the
and had provision for a few or for the indication of position of the disc of the swing check valve. Conventional swing check valves cannot be operated manually. In the present invention manual operation is provided to check, operate and ensure free movement of disc of the said valve. This type of chock valve to termed as a testable check valve. Check valves are unidirectional valves that is they it permit flow in only one direction.
In the case of testable check valves the hinge pin of the normal check valve is extended out of the body and coupled/attached to the disc opening mechanism. Typical testable check valve will have a hinge pin extending out of the body and attached to a lever/crank. The rotation of a lever causes hinge pin to rotate and thereby the disc; but such an arrangement has the following drawbacks:.
1. There will be additional load acting on the hinge pin all the time, which
2. increases the force to lift the disc,
3. At low pressure conditions the problem becomes more severe, and can
4. stop the lifting of the disc,
5. There are no means to monitor valve operation from control room/remote
6. place.

This invention not only overcomes all the above drawbacks, but at the same it makes it possible to monitor the valve operation from a remote place/control room.
This invention will now be described with references to the accompanying drawings, which illustrate by way of example and not by way of limitation, one of possible embodiments of this invention
The body(1), cover(2) & yoke(3) are pressure-containing parts and will be under pressure and temperature. The disc (4) is connected to hinge(5). The hinge is pivoted by hinge pin(6) with help of keys(7). The Hinge pin is supported by bracket (8), bush(9). The disc gets open when flow is in direction of the arrow. The frictional resistance between hinge pin and hinge plays determines the force to open the disc. Any addition to this force will offer more resistance in swinging the disc (thereby opening the valve). A cylindrical magnet (10) is mounted on hinge pin. The yoke is joined to the body by means such as welding. The extension shaft (11) is mounted with guide (12), hand wheel(13), cam(14). The extension shaft can be engaged and disengaged with hinge pin with the help of hand wheel. Ends of the hinge pin and shaft are shaped to form rotating pair whenever there is engagement. The proximity sensor (15) senses the position of
disc close/open position. The limit switch (16) senses hand wheel/extension shaft engage/disengaged condition. Stopper pin (17) aids in operating limit switch as

well as restricts movement of extension shaft in engage / disengage position. The cam gives required lift for operation of limit switch. The stuffing box assembly comprises graphite packing, lantern ring, gland & gland flange. The end cap(18) restricts movement of hinge pin in the other direction. The end cover (19) and packing(20) prevents leakage at other end. The embodiment operates as follows:
1. In normal operation of the valve, extension pin Is not connected with hinge pin
2. and hence valve functions as the known swing check. The magnetic proximity
3. sensor(15) senses the position of magnet(10) and gives output (valve close
4. condition). During this condition stopper pin should be placed in groove 1 of cam.
5. The limit switch will be in triggered position, as knob (21) mounted on stopper pin
6. will press push button of limit switch.
7. When there is need to open the valve, - Stopper pin is putted from groove 1 of
8. cam and rotated through 90° and left as it is, extension shaft is pushed forward
9. with help of hand wheel until it engages with slot of hinge pin. At this position
10. stopper pin is rotated through 90°, this will push it to groove 2 of cam (14). The
11. limit switch will not get triggered as now knob will not press the push button of
12. limit switch. Now the disc can be swung with the help of hand wheel. The
13. moment hinge pin rotates more than 2* angle; proximity(15) will stop its signal,
14. when hinge pin is rotated to maximum position (when disc will swing to
15. maximum, angle) proximity(15") will give the signal. This is the value max. Open
16. indication.

3. In order to close the valve again-hand wheel will be released slowly from max Position, The disc will return to its position and proximity(15) will give output (indication of valve close position). The stopper pin will be pulled out of groove 2 and rotated through 90o. The extension shaft will be pulled back until groove 1 cam faces the stopper pin. Stopper pin will be rotated through 90°. Stopper pin will get engaged with groove 1, which will trigger limit switch (16).
Thus valve close and valve Max open conditions can be checked with help of signal from proximity sensors.
Extension shaft engagement with hinge pin is checked by limit switch.
Various other embodiments of the swing check valve proposed herein are possible without departing from the scope and ambit of this invention.

We claim:
1. A testable swing check valve comprising a hinge pin, extension shaft with
guide, hand wheel, cam, stopper pin, knob, spring keys, end cap, end cover,
yoke, stuffing box, proximity (magnetic) sensors for indicating disc position,
limit switch for indicating engagement of mechanism with hinge pin, and a
magnet for enabling the sensors to sense the disc position.
2. A testable swing check valve as claimed in Claim 1 wherein the magnetic
sensors and limit switch enable valve operation to be monitored from a control
room.
3. A testable swing check valve substantially as herein described with reference
to, and as illustrated in, the accompanying drawings.


Documents:

0185-che-2007 correspondence po.pdf

185-che-2007 amended claims 13-07-2010.pdf

185-che-2007 amended pages of specification 13-07-2010.pdf

185-che-2007 claims.pdf

185-che-2007 correspondance others.pdf

185-che-2007 description(complete).pdf

185-che-2007-abstract.pdf

185-che-2007-claims.pdf

185-che-2007-correspondnece-others.pdf

185-che-2007-description(complete).pdf

185-che-2007-drawings.pdf

185-che-2007-form 1.pdf

185-che-2007-form 18.pdf

185-che-2007-form 26.pdf


Patent Number 246969
Indian Patent Application Number 185/CHE/2007
PG Journal Number 12/2011
Publication Date 25-Mar-2011
Grant Date 23-Mar-2011
Date of Filing 29-Jan-2007
Name of Patentee AUDCO INDIA LIMITED
Applicant Address AUDCO INDIA LIMITED, MOUNT POONAMALEE ROAD, MANAPAKKAM, CHENNAI 600089
Inventors:
# Inventor's Name Inventor's Address
1 RAMAKRISHNAN MURUGANANTHAM AUDCO INDIA LIMITED, MOUNT POONAMALEE ROAD, MANAPAKKAM, CHENNAI 600089
2 KALYAN SHIVANAGOUDA PATIL AUDCO INDIA LIMITED, MOUNT POONAMALEE ROAD, MANAPAKKAM, CHENNAI 600089
PCT International Classification Number F16K15/03
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA