Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1997-08-11
1999-03-09
Ryznic, John E.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
92446, 92448, 92454, 13759616, 137508, 1375961, 251 3004, F16K 3112, F15B 1108, F15B 1304
Patent
active
058786473
ABSTRACT:
A pilot operated control valve has a housing defining an inlet and an outlet. A main valve poppet selectively engages a valve seat to control flow of fluid between the inlet and outlet. An aperture in the main valve poppet opens into a control chamber on a side of the main poppet remote from the valve seat. A pilot passage is formed in the main valve poppet with an inlet section between the inlet and the control chamber, and an outlet section between the aperture and the control chamber. A pilot poppet has a body that selectively seals communication between the control chamber and the aperture, and a pressure balancing stem attached to the body extends into the aperture. The pressure balancing stem having a recess which is acted upon by pressure in the outlet section and having an end which is acted upon by pressure in the inlet section. The pilot operated control valve also incorporates a compression check valve and/or a reverse flow check valve.
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Wilke Raud A.
Yang Xiaolong
HUSCO International Inc.
Ryznic John E.
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