Hydraulic actuator for pressure switch of fluidic system

Details Hydraulic actuator for pressure switch of fluidic system Hydraulic actuator for pressure switch of fluidic system

1994-10-07

1996-04-23

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 43, 200 819R, 137219, F04B 4900

Patent

active

055097871

ABSTRACT:
An hydraulic actuator of a constant pressure fluidic supply system is disclosed in which a movable shuttle disposed within a generally cylindrical housing forms therewith a plurality of piston and cylinder assemblies. Displacement of the shuttle within the housing is governed substantially by opposing hydrodynamic and hydrostatic forces balanced so as to selectively isolate a pump control pressure switch from system pressure during periods of moderate to high consumption demand and provide communication therewith during periods of low to zero consumption demand. An hydropneumatic tank or a conventional diaphragm tank may be used in combination with the actuator to provide fluidic capacitance to the system. Additional system valving and pressure regulation may be incorporated as desired.

REFERENCES:
patent: 3560706 (1971-02-01), Fonseca
patent: 3739810 (1973-06-01), Horan, Jr.
patent: 3782858 (1974-01-01), Deters
patent: 3871792 (1975-03-01), Gritz
patent: 3876336 (1975-04-01), Nash
patent: 4124332 (1978-11-01), Nishijyo
patent: 4281968 (1981-08-01), Akers
patent: 4329120 (1982-05-01), Walters
patent: 5099544 (1992-03-01), Yamamoto
patent: 5190443 (1993-03-01), Valdes
patent: 5197859 (1993-03-01), Siff

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