Constant fluid level control for machine reservoir

Details Constant fluid level control for machine reservoir Constant fluid level control for machine reservoir

1977-05-09

1978-09-26

Cline, William R.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

13710127, 137413, F04B 4900

Patent

active

041165861

ABSTRACT:
A housing contains a slidable spool operable to port a first pressurized fluid line to a fluid motor, and a housing reservoir has a float movable with a fluid level. The motor drives a pump which "pumps down" the reservoir. A second pressurized fluid line is directed through a primary fixed orifice and against one end of the spool, acting against a spring bias, and is permitted to exit through an end orifice to the reservoir. The float moves in response to the fluid level and operates to shut off the end orifice flow, thereby building up backpressure to shift the spool, and thus varying outlet flow from the valve in accordance with the reservoir level. Therefore, the reservoir is pumped down in accordance with reservoir build-up.

REFERENCES:
patent: 3930423 (1976-01-01), Craig

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