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US 6,352,239 B1Granted
Gate valve actuator override mechanism
AssigneeFMC Corporation
InventorsGavin John Liam McIntosh, Graeme John Collie
Life of this patent
Estimating the term…
Abstract
A gate valve hydraulic actuator having a stem extension accessible from outside the actuator body to provide override operation of the gate valve, for example in the event of hydraulic failure. The stem extension is lockable to a spring compression hub in a valve open position and a valve closed position by locking dogs selectively engageable in recesses. The locking dogs are operated by a cam spindle coaxially received in the stem extension.
Claims14
A gate valve actuator comprising:
- an actuator body including a spring;
- a valve stem received in the actuator body for linear sliding movement;
- a piston connected to the valve stem for hydraulic actuation of the valve stem;
- a spring compression hub, the spring compression hub biased towards a valve closed position by the spring;
- a stem extension accessible from outside the actuator body for imposition of linear sliding movement thereto, the stem extension forming an axial bore;
- a cam spindle received in the axial bore;
- and
- locking dogs carried by or engageable with the stem extension, the locking dogs operable to lock the stem extension to the spring compression hub, wherein the locking dogs are actuated by the cam spindle.
5 more elements
A gate valve hydraulic actuator, comprising:
- an actuator body;
- a valve stem positioned within the actuator body;
- a valve stem extension connected to the valve stem, at least a portion of the valve stem extension positioned within the actuator body, the valve stem and the valve stem extension axially displaceable with respect to the actuator body;
- a spring compression hub surrounding at least a portion of the valve stem extension;
- and
- at least one locking dog connected with respect to the valve stem extension, the at least one locking dog engageable with one of an outer recess of the spring compression hub and an inner recess of the spring compression hub,
- wherein the valve stem extension forms a longitudinal bore in which a cam spindle is received, the cam spindle is rotatable between a first position wherein the at least one locking dog is engaged with one of the outer recess and the inner recess and a second position wherein the at least one locking dog is disengaged from one of the outer recess and the inner recess.
4 more elements
A gate valve hydraulic actuator, comprising:
- an actuator body;
- a valve stem positioned within the actuator body;
- a valve stem extension connected to the valve stem, at least a portion of the valve stem extension positioned within the actuator body, the valve stem and the valve stem extension axially displaceable with respect to the actuator body;
- a spring compression hub surrounding at least a portion of the valve stem extension;
- at least one locking dog connected with respect to the valve stem extension, the at least one locking dog engageable with one of an outer recess of the spring compression hub and an inner recess of the spring compression hub;
- and
- a drive formation connected to a cam spindle, the drive formation rotatable to one of engage and disengage the at least one locking dog with respect to one of the outer recess and the inner recess.
4 more elements
Dependencies are inferred from the claim text.