Self-depressurizing metering valve

Details Self-depressurizing metering valve Self-depressurizing metering valve

1975-04-07

1977-01-18

Weakley, Harold W.

Fluid handling

Systems

Supply and exhaust

137501, 137613, F16H 1100

Patent

active

040034003

ABSTRACT:
A self-depressurizing hydraulic control valve having a sliding-type metering valve to control the flow of hydraulic fluid through the valve and also a shutoff valve to stop the flow automatically. The shutoff valve is responsive to the rate of flow of fluid through the control valve and stops the flow when the flow rate decreases to a preselected value. When the shutoff valve closes, the control edges of the metering valve are no longer exposed directly to high pressure fluid, and quiescent leakage across the edges is practically eliminated. Thus, electrochemical erosion of the metering edges resulting from such leakage is substantially reduced.

REFERENCES:
patent: 2977971 (1961-04-01), Ruhl
patent: 3398649 (1968-08-01), McMillen
patent: 3526247 (1970-09-01), McMillen
patent: 3534774 (1970-10-01), Tennis
patent: 3570522 (1971-03-01), Horsch
patent: 3777773 (1973-12-01), Tolbert

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