Pressure control valve for an open hydraulic circuit
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United States of America Patent
Stats
-
Jul 30, 1985
Grant Date -
N/A
app pub date -
Jan 15, 1981
filing date -
Jan 23, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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