Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1989-03-21
1990-02-27
Cohan, Alan
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 94, 251167, 251169, F16K 31124
Patent
active
049039377
ABSTRACT:
An isolation valve includes a housing having a port and a seal plate for sealing the port. The seal plate is linked to a shaft which carries a guide frame. To close the port, a drive mechanism drives the shaft linearly in one direction. The seal plate first moves linearly with the shaft until the guide frame stops against the housing. The seal plate then moves linearly in a direction perpendicular to a surface of the housing containing the port until it seals the port. Motion of the drive shaft in the opposite direction causes the seal plate to retrace its path. In one embodiment, the valve includes a second seal plate for sealing a second port. A spring between the guide means and the shaft provides pre-load which maintains the seal plates in a retracted position until the frame stops against the housing. An extension spring between the first and second seal plates eliminates play in the link mechanism and extends valve life.
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VAT Incorporated, "High Vacuum, Ultra High Vacuum and All Metal Valves", Ordering Information, Technical Data, Price List 1984, pp. 15-30.
Daley Thomas M.
Jakubiec Antoni F.
Cohan Alan
Varian Associates Inc.
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