Proportional electro-hydraulic pressure control valve

Details Proportional electro-hydraulic pressure control valve Proportional electro-hydraulic pressure control valve

1986-08-19

1989-01-10

Rivell, John

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137557, 25112908, 73726, 165 803, 361383, F16K 3102

Patent

active

047966610

ABSTRACT:
A proportional electro-hydraulic pressure control valve incorporates a pressure sensor in its valve body and the hydraulic fluid pressure in a pressure detecting fluid path provided in the valve body is delivered as an electric signal output by the pressure sensor. The pressure detecting fluid path is connected to a hydraulic fluid inlet port directly or through a restrictor or alternately the fluid path is connected to a pressure detecting port separated from both of the hydraulic fluid inlet port and a hydraulic fluid outlet port. The electric signal output from the pressure sensor is utilized to provide a numerical display of the controlled pressure or to effect the feedback control of a solenoid drive current through a closed loop.

REFERENCES:
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patent: 3552428 (1971-01-01), Pemberton
patent: 3890992 (1975-06-01), Wolz et al.
patent: 4253480 (1981-03-01), Kessel et al.
patent: 4399836 (1983-08-01), de Versterre et al.
patent: 4413684 (1983-11-01), Walters et al.
patent: 4488574 (1984-12-01), Bartholomaus
patent: 4489749 (1984-12-01), Buschor et al.
patent: 4520657 (1985-06-01), Marthaler
patent: 4557225 (1985-12-01), Sagues et al.
patent: 4587593 (1986-05-01), Liautaud et al.
patent: 4620263 (1986-10-01), Ito

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