F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/84
F16K 31/00 (2006.01) E21B 34/16 (2006.01) F16K 11/00 (2006.01) F16K 17/10 (2006.01) F16K 31/36 (2006.01)
Patent
CA 1092483
TITLE: VALVE ACTUATOR AND PILOT ASSEMBLY THEREFOR ABSTRACT OF THE INVENTION 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 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 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 engagable 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 selec- tively shiftable in response to variation of fluid pressure to permit the fluid pressure to act within the actuator to manip- ulate 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 selec- tively overcome travel resistance of the spool by the resistance means and to thereafter shift the spool. The present actuator is a self-contained unit and is respon- sive to variations in pressure normally transmitted through the valve manipulated by the operative means thereof. The pilot assembly and actuator have particular utility on fluid flow lines, such as oil and gas transmission lines. The invention is equally adaptable to pneumatic and hydraulic systems.
290412
Baker International Corporation
Borden Ladner Gervais Llp
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