Pilot operated pressure reducing valve

Details Pilot operated pressure reducing valve Pilot operated pressure reducing valve

1990-02-26

1992-01-14

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137491, 137492, G05D 1600

Patent

active

050801295

ABSTRACT:
The present invention provides a pilot operated pressure reducing valve in which the pilot liquid (generally the pilot fluid) is taken from the low pressure side, wherein two pilot liguid connections (or conduits) from the low pressure side to the pilot valve are provided which the separate from each other. The one connection takes the pilot liquid (or fluid) from the control area of the control spool while the other connection takes the pilot liquid (or fluid) from outside the control range (or area) of the control spool. A check valve is provided to seperate said two connections and closes to the low pressure side. Thus, even for large volume flows and large pressure differentials, between the high pressure side and the low pressure side, good control- and stability characteristics are obtained.

REFERENCES:
patent: 2184670 (1939-12-01), Harrington
patent: 3373763 (1968-03-01), Smilges
patent: 3960170 (1976-06-01), Schuhmacher et al.
"The Hydraulic Trainer", Mannesmann Rexrath GmbH, Jul. 1981, pp. 122-123.

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