Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1977-05-06
1979-06-05
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
137102, 137458, 137488, 251318, F16k 31124
Patent
active
041571673
ABSTRACT:
A valve actuator and a pilot assembly responsive to control fluid pressure for moving an operative means of a valve. The actuator has a housing defining a cylindrical bore therethrough and a shaft is carried in the housing which is engagable with the operative means. A piston is carried by one of the shaft and the housing and is sealingly slidable along the other of the shaft and the housing and is longitudinally movable within the cylindrical bore. A plurality of piston chambers are companionly associated with the piston and is responsive to control of source fluid pressure within a pilot assembly to manipulate the piston.
The pilot assembly comprises pilot means within the housing, having valve seat means thereon. Normally free traveling spherical members define valve head means selectively sealingly engagable on the pilot means to open and close the pilot means. A pilot spool permits selective movement of the spherical members to the immediate vicinity of the valve seat means of the pilot means. Fluid flow causes the spherical members to seek and selectively seal onto the valve seat means. The spool is selectively shiftable in response to variation of fluid pressure to permit the fluid pressure to act within the actuator to manipulate the operative means between open and closed positions. A stem extension is provided within the actuator housing and is engaged to the spool, together with resisting means, such as compressible springs and the like, within the housing and are carried around the stem for resisting travel of the spool in one direction. Differential pressure areas are defined across the spool and are responsive to fluid pressure variance to selectively overcome travel resistance of the spool by the resistance means and to thereafter shift the spool.
REFERENCES:
patent: 2935998 (1960-05-01), Richardson
patent: 3007492 (1961-11-01), Grimmer
patent: 3389718 (1968-06-01), Johnson et al.
patent: 3540690 (1970-11-01), Brown
patent: 3621881 (1971-11-01), Vicari
Baker International Corporation
Norvell, Jr. William C.
Schwadron Martin P.
Walton G. L.
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