Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1974-12-20
1976-08-31
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
1375961, 1376275, 137DIG4, 303 54, F15B 1314
Patent
active
039774252
ABSTRACT:
A hydraulic pressure control valve has a piston slidably disposed in a bore of a housing and having a supplying pressure chamber therein which is communicated with a source of hydraulic pressure, an actuating pressure space defined in the bore for communicating with a pressure actuating means, the piston being exposed to the space at one side thereof and urged toward the space by a resilient means and having a supply opening for connecting said chamber with the space. A push rod is slidably disposed in the bore and operably connected to an operating means, a supply valve normally closing the supply opening and coaxially disposed in the piston. A normally open exhaust valve connects the actuating pressure space with a reservoir which supplies hydraulic fluid to the pressure source, the push rod being adapted to move toward the pressure space and the piston, when operated for closing the exhaust valve and further movement of the piston in the same direction, opening the supply valve.
REFERENCES:
patent: 537819 (1895-04-01), Egan
patent: 1144758 (1915-06-01), Desmond
patent: 1541913 (1925-06-01), Bartholomew
patent: 2470746 (1949-05-01), Schultz
patent: 2812218 (1957-11-01), Fitch et al.
patent: 3532395 (1970-10-01), Julow
Cohan Alan
Michalsky Gerald A.
Tokico Ltd.
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