Back to results
US 9,027,581 B2Granted
Pneumatic controlled slam shut valve
AssigneeDresser, Inc.
InventorDavid C. Butler
Life of this patent
Estimating the term…
Abstract
Systems and methods provide pneumatic control of a slam shut valve system.
Claims18
A pneumatic controlled slam shut valve system, comprising:
- a slam shut valve having an inlet, an outlet, and an internal closure element disposed there between;
- a mechanical linkage system having a distal end of a pawl lever contacting a flapper lever attached to the internal closure element;
- an actuator assembly including an actuator diaphragm and an actuator pin, said actuator pin contacting a proximal end of the mechanical linkage system, said actuator diaphragm operable to receive a pneumatic pressure signal on a first side and to move the actuator pin connected to the actuator diaphragm;
- at least one trip control valve operable to receive a sensed pressure downstream of the slam shut valve, the at least one trip control valve operable to output a pneumatic pressure signal from a discharge port;
- a conduit system connected to the discharge port of the at least one trip control valve and operable to transmit the pneumatic pressure signal to the first side of the actuator diaphragm;
- and
- a vent valve connected to the conduit system, said vent valve having a movable pin with a distal end contacting the flapper lever when the internal closure element is in an open position,
- wherein contact between the flapper lever and movable pin holds the vent valve in an open position releasing the pneumatic pressure in the conduit system between the at least one trip control valve and the actuator assembly.
5 more elements
A slam shut valve, comprising:
- an internal closure element having a first position and a second position;
- a linkage coupled with the internal closure element, the linkage comprising a first lever;
- and
- a vent valve adapted to release pneumatic pressure in a conduit system between a trip control valve and an actuator assembly, the vent valve comprising a movable pin with a distal end that is configured to contact the first lever,
- wherein contact between the first lever and the movable pin configures the vent valve in an open position.
2 more elements
A method for pneumatic control of a slam shut valve, comprising:
- sensing a pressure downstream of a slam shut valve;
- transmitting the sensed pressure to a trip control valve;
- outputting a pneumatic pressure signal from the trip control valve to the actuator diaphragm of an actuator assembly;
- moving an actuator pin connected to a diaphragm of the actuator assembly and moving a proximal end of a mechanical linkage with the actuator pin;
- and
- transmitting movement of the proximal end of the linkage system via the mechanical linkage to a distal end of the mechanical linkage thereby:
- initiating movement of a closure element of the slam shut valve from an open valve position to a closed valve position
- wherein transmitting movement of the proximal end of the linkage system via the mechanical linkage to a distal end of the mechanical linkage further includes releasing a poppet in a vent valve to move to its closed position.
5 more elements
A method for resetting a pneumatic controlled slam shut valve comprising:
- rotating a flapper shaft:
- to move an internal closure element of a slam shut valve from a shut position to an open position;
- and
- to move a flapper attached to the flapper shaft into contact with the movable pin of a vent valve connected to a conduit system between a trip control valve and an actuator assembly;
- opening the vent valve through contact of the flapper attached to the flapper shaft into contact with the movable pin;
- and
- releasing pressure from the conduit system between the trip control valve and the actuator assembly.
4 more elements
Dependencies are inferred from the claim text.