Pump unloading valve device

Details Pump unloading valve device Pump unloading valve device

1975-06-05

1976-07-27

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

G05D 1610

Patent

active

039713970

ABSTRACT:
This invention relates to a pump unloader that includes two cylindrical valve members of the same diameter slidably mounted in the same bore and each biased in the same direction by its own spring. These valve members are so connected by a lost-motion connection as to be simultaneously shiftable in one direction upon storage reservoir pressure acting on one valve member reaching a chosen cut-out pressure until the other valve member begins to open a communication whereupon this other valve member is subject to pump discharge pressure to cause it to be quickly shifted relative to the one valve member to a pump unloading position in which the pump discharge is returned to a sump. Thereafter, as reservoir pressure is reduced, both valve members are simultaneously shiftable in an opposite direction to cut off flow from the pump to the sump whereupon the pump is reloaded after which the spring acting on the other valve member shifts it relative to the one valve member to its original position with respect to this one valve member.

REFERENCES:
patent: 1731145 (1929-10-01), MacMillen
patent: 2339378 (1944-01-01), Clench
patent: 2501054 (1950-03-01), Huber

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