Pressure controlled swing valve with safety feature

Details Pressure controlled swing valve with safety feature Pressure controlled swing valve with safety feature

1975-07-09

1977-08-16

Cohen, Irwin C.

Fluid handling

Systems

Multi-way valve unit

91433, 91461, 13762427, 13762566, F15B 13042

Patent

active

040419835

ABSTRACT:
A pilot operated directional control valve is provided with pressure controlling means responsive to motor line pressure to control the shifting of the control valve to maintain a precisely controlled variable torque in a motor controlled thereby. The pressure controlling means includes constant force centering means for the valve and a piston at each end of the control valve with means communicating motor line pressure to the piston to operate in opposition to a piston subject to pilot control pressure for shifting the valve.

REFERENCES:
patent: 2157240 (1939-05-01), Keel
patent: 2931389 (1960-05-01), Moog, Jr. et al.
patent: 2964059 (1960-12-01), Geyer
patent: 3267965 (1966-08-01), Kroffke
patent: 3511276 (1970-05-01), Jessen et al.
patent: 3640146 (1972-02-01), Barnes
patent: 3650286 (1972-03-01), Armstrong
patent: 3746401 (1973-07-01), Stearns
patent: 3818802 (1974-06-01), Wilson
patent: 3859791 (1975-01-01), Allen

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