Valves and valve actuation – With selective flow regulation
Patent
1981-03-31
1984-03-06
Michalsky, Gerald A.
Valves and valve actuation
With selective flow regulation
91446, 1376253, 13762564, 13762566, 13762569, 137270, 251121, 251324, F16K 326, F15B 13043
Patent
active
044349661
ABSTRACT:
An electro-hydraulic proportional control valve includes an electro-hydraulic pilot valve, an inlet pressure reducing valve, and a directional control valve. The electro-hydraulic pilot valve receives an electrical input signal and provides a hydraulic signal to the directional control valve in response to the electrical signal. The inlet pressure reducing valve modulates fluid flow from a pump to the directional control valve to maintain a constant pressure drop across the directional control valve under all conditions. The directional control valve includes a directional control valve spool which shifts between a neutral position, a leftward displaced position, and a rightward displaced position in response to the hydraulic signal from the electro-hydraulic pilot valve. The directional control valve spool includes a range adjustment device for adjusting and setting the flow rate through the directional control valve.
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patent: 3866620 (1975-02-01), Morton
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patent: 4238112 (1980-12-01), Derozier
Baker James A.
Michalsky Gerald A.
Parker-Hannifin Corporation
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