Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1078-08-03
1980-02-12
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
137458, 137488, 251 28, 251 63, 251 636, G05D 700, F16K 31124
Patent
active
041878701
ABSTRACT:
A valve actuator and a pilot assembly which may be utilized either alone or with the actuator is responsive to control fluid pressure for moving an operative means of a valve between open and closed positions. The actuator has a housing defining a cylindrical bore therethrough and a shaft is carried in the housing which is engageable 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.
The pilot assembly comprises a cylindrical housing having pilot means within the housing, the pilot means having valve seat means thereon. Normally free traveling spherical members are provided immediate the pilot means and define valve head means selectively sealingly engageable on the pilot means to open and close the pilot means to control fluid flow therethrough. A pilot spool within the housing and immediate the pilot means and operably associatable with the pilot means and the spherical members permits selective movement of the spherical members to the immediate vicinity of the valve seat means of the pilot means. The spool is manipulatable in at least one of linear and rotary directions. 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.
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patent: 3049140 (1962-08-01), Thornhill et al.
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patent: 3389718 (1968-06-01), Johnson et al.
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patent: 3621881 (1971-11-01), Vicari
patent: 3958592 (1976-05-01), Wells et al.
patent: 4078073 (1978-05-01), Runberg et al.
Baker International Corporation
Norvell, Jr. William C.
Schwadron Martin P.
Walton G. L.
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