Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1975-07-22
1977-04-26
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 634, F16K 31122
Patent
active
040197131
ABSTRACT:
A rapid shutoff extraction check valve has a movable valve body cooperating with a valve seat that divides a valve housing into an upstream housing chamber communicating with the valve inlet and a downstream housing chamber communicating with the valve outlet. The movable valve body is displaceably supported by an actuating piston which is slidably received in a guide cylinder enclosing a pressure chamber. The actuating piston has a radial face exposed to pressure in the downstream housing chamber. An auxiliary valve forming part of the rapid shutoff check valve has a first position in which communication is maintained between one housing chamber and the pressure chamber and a second position in which the pressure chamber is vented. In the first position of the auxiliary valve the actuating piston exerts a closing force on the movable valve body.
REFERENCES:
patent: 723025 (1903-03-01), Resor
patent: 862867 (1907-08-01), Eggleston
patent: 2377227 (1945-05-01), Griswold
patent: 2417994 (1947-03-01), Sheets
patent: 2445163 (1948-07-01), Williamson
patent: 2661023 (1953-12-01), Griswold
patent: 2744719 (1956-05-01), McRae
patent: 2789510 (1957-04-01), Meynig
patent: 2841359 (1958-07-01), Berck
patent: 3101924 (1963-08-01), Berck
AEG-Kanis Turbinenfabrik GmbH
Schwadron Martin P.
Walton G. L.
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