Hydraulic failsafe valve actuator
AssigneeHP&T Products, Inc.
InventorVijay Chatufale
Life of this patent
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Abstract
A hydraulic actuator for operating a gate valve. The actuator includes a stationary piston coupled to an actuator housing and a moveable cylinder disposed proximate the piston exterior surface. The piston includes a hollow interior portion adapted to house a manual override mechanism. The piston includes a hydraulic pressure line extending between the piston bottom surface and the side of a cap region in the piston. The manual override mechanism includes an override stem disposed within the piston interior portion, the override stem abutting the cylinder. An optional visual indicator stem may be disposed within the piston, coupled to the cylinder
Claims33
A fluid actuator, comprising:
- an actuator housing having a top portion and a bottom portion;
- a stationary piston fixedly coupled to the actuator housing top portion, the piston including an exterior surface, a bottom surface, and an upper cap region having a side;
- a hollow cylinder disposed within the actuator housing proximate the piston exterior surface, the cylinder including an exterior surface and an exterior upper region, the cylinder including a shoulder at the exterior upper region;
- a hydraulic pressure line disposed within the stationary piston, the hydraulic line extending between the piston bottom surface and the piston cap region side;
- and
- an operating stem coupled to the cylinder, the operating stem being disposed within the actuator housing bottom portion.
A fluid actuator, comprising:
- an actuator housing having a top portion and a bottom portion;
- a stationary piston fixedly coupled to the actuator housing top portion, the piston including an exterior surface, an external bottom surface, an upper cap region having a side, and a hollow interior portion;
- a hollow cylinder disposed within the actuator housing proximate the piston exterior surface, the cylinder including an internal bottom surface, an exterior surface and an exterior upper region, the cylinder including a shoulder at the exterior upper region, wherein the internal bottom surface is the pressure-receiving surface;
- and
- an operating stem coupled to the cylinder, the operating stem being disposed within the actuator housing bottom portion.
An override mechanism for a hydraulic actuator having a stationary piston, the piston including an exterior surface, a hollow interior portion and an upper cap portion, the piston upper cap portion fixedly coupled to an actuator housing, the actuator including a hollow moveable cylinder disposed proximate the piston exterior surface, the override mechanism comprising:
- an override stem disposed within the piston interior portion, the override stem abutting the cylinder.
A method of manufacturing a fluid actuator, comprising:
- providing an actuator housing having a top portion and a bottom portion;
- fixedly coupling a stationary piston to the actuator housing top portion, the piston including an exterior surface, a bottom surface, an upper cap region having a side, and a hollow interior portion;
- forming a hydraulic pressure line within the stationary piston, the hydraulic line extending between the piston bottom surface and the piston cap region side;
- disposing a hollow cylinder within the actuator housing proximate the piston exterior surface, the cylinder including an exterior surface and an exterior upper region, the cylinder including a shoulder at the exterior upper region;
- coupling an operating stem to the cylinder within the actuator housing bottom portion;
- disposing a spring around the cylinder exterior surface within the actuator housing;
- coupling a spring plate between the spring and the cylinder shoulder;
- and
- coupling a bonnet assembly to the actuator housing lower portion.
Dependencies are inferred from the claim text.