Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1978-09-18
1980-02-12
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
F16K 31122
Patent
active
041880110
ABSTRACT:
An interface assembly is provided for operation with the spool valve elements comprising means which are extendable to the spool and a piston head element within the housing and carried around the extension means for travel along the extension means in response to pressure variation. Spherical means are securable on the piston head together with means for urging the spherical means toward the spool extension means. First and second camways are defined on the extension means for travel of the spherical means which are secured on the piston. A shoulder on the extension means defines the intersection between the first and second camways and resists travel of the piston-housed spherical means along one of the camways when the piston is shifted in a first direction. The piston head is shiftable in a first direction in response to fluid variation for travel along the spool extension for transfer of the spherical means within the piston from one camway to the other camway without movement of the spool within the housing. The piston head is shiftable in a second direction in response to second pressure variation for interface with the spherical elements carried in the piston with the shoulder and carriage of the spool to shift the spool to another position to vary the fluid flow path through the spool valve. The present apparatus may be utilized to manipulate, for example, a downhole safety valve between open and closed position in response to signal variation indicating abnormal well flow, or the like.
REFERENCES:
patent: 3007492 (1961-11-01), Grimmer
patent: 4073466 (1978-02-01), Snyder
Baker CAC, Inc.
Michalsky Gerald A.
Norvell, Jr. William C.
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