Metering valve

Details Metering valve Metering valve

1988-06-29

1989-08-29

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374925, 137495, 251 63, G05D 1600

Patent

active

048607886

ABSTRACT:
A metering valve adapted to operate a seat on a side of an actuator port by means of a poppet section of a main poppet arranged in a valve casing to selectively communicate the actuator port to a tank passage. The main poppet is formed with a pressure chamber on a side thereof opposite to the poppet section. The pressure chamber has a pressure receiving area substantially equal to that of the seat. Also, the main poppet is formed with a through-hole constantly communicated to the actuator port and a pilot chamber to which pilot pressure for moving the main poppet in a direction of opening the seat is applied. Thus, the metering valve is capable of stably accomplishing its control irrespective of a variation of pressure on the side of the actuator port.

REFERENCES:
patent: 3318326 (1967-05-01), Nevulis
patent: 3389796 (1968-06-01), Fiala
patent: 3771554 (1973-11-01), Hassall
patent: 4167262 (1979-09-01), Lemmon
patent: 4548231 (1985-10-01), Schwede

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