Pressure control valve for an open hydraulic circuit

Details Pressure control valve for an open hydraulic circuit Pressure control valve for an open hydraulic circuit

1981-01-15

1985-07-30

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 30, F16K 3112

Patent

active

045317070

ABSTRACT:
The valve is arranged to control the pressure of a hydraulic fluid by discharging a proportion of its flow, and comprises a mobile valve element arranged to control the opening of a discharge port of a first chamber and kept normally closed by the action of a spring, a piston element rigid with said valve element and arranged to define a second chamber which is in hydraulic communication with the first by way of a first bore of predetermined size, and a third chamber in hydraulic communication both with the preceding by way of a second bore also of predetermined size, and with the discharge outlet by way of a discharge port the opening of which is controlled by an interception member operated by an electromagnet; the pressure of said fluid is controlled by varying the discharge port controlled by said interception member and consequently the rate of a flow of control fluid passing through said first bore, second chamber, second bore and third chamber.

REFERENCES:
patent: 2673706 (1954-03-01), Matteson
patent: 2747606 (1956-05-01), Adams et al.
patent: 2758811 (1956-08-01), Peterson
patent: 3204926 (1965-09-01), Wismar
patent: 3250294 (1966-05-01), Hipple
patent: 3381931 (1968-05-01), Boonshaft
patent: 4201362 (1980-05-01), Nishimi et al.

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