Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent
1979-03-01
1981-08-25
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
92 75, 92 76, 251 31, 251 58, 251229, 251280, F16K 31143, F16K 3150
Patent
active
042854938
ABSTRACT:
A fail-safe-open actuator for actuating valves and the like which comprises a pair of opposed cylinders joined to define piston chambers, the axes of which are generally perpendicular to a valve stem. Pistons in the cylinders are connected to the valve stem by toggle links, the pistons being resiliently urged toward the ends of the assembly which corresponds to an open-valve position. To close the valve, a pressurized fluid, such as air, is introduced into the piston chambers and to the pistons at sufficient pressure to counter the resilient means so as to move the pistons away from their rest, valve-open positions, and thus move the valve stem perpendicularly to the axis of the piston chamber. A handwheel is provided to manually close the valve by moving the pistons from their rest positions.
A solenoid controlled pneumatic valve may be used to control the supply of pressurized fluid, such as air, to the actuator. Either a failure in fluid pressure or an electrical failure will result in the pistons being urged to the rest positions and also result in opening the connected valve, i.e., the failure mode.
REFERENCES:
patent: 1532029 (1925-03-01), Bobbitt
patent: 1627658 (1927-05-01), Mauss
patent: 2042906 (1936-06-01), McElwaine
patent: 4029289 (1977-06-01), Miffre
patent: 4050670 (1977-09-01), Borg et al.
Borg-Warner Corporation
Burgess Aubrey L.
Schwadron Martin P.
Walton G. L.
LandOfFree
Valve operator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve operator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve operator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1155005