Gear pump having conditional dry valve closure structure

Details Gear pump having conditional dry valve closure structure Gear pump having conditional dry valve closure structure

1987-02-27

1988-05-24

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417310, F04B 4902, F04B 4908

Patent

active

047462760

ABSTRACT:
A dry valve for a gear pump includes a piston having a valve head and a piston head mounted on the opposite ends of a piston rod. The piston is selectively movable between an opened position, wherein hydraulic fluid is permitted to flow from a reservoir to a pumping chamber of the gear pump, and a closed position, wherein such flow is obstructed. A source of pressurized air exerts a biasing force against the piston head to selectively move the piston. An outlet port of the gear pump is connected through a feedback passageway to the dry valve. The feedback passageway communicates with the side of a chamber in which the piston rod of the dry valve reciprocates between the opened and closed positions. When the dry valve is in the opened position, the pressurized fluid from the outlet port of the gear pump exerts a side-loading pressure against the piston rod, causing a frictional force to be generated between the piston rod and the piston rod chamber which resists relative movement.

REFERENCES:
patent: 3280557 (1965-04-01), Sattavara
patent: 3407894 (1968-10-01), Thompson et al.
patent: 3424262 (1967-07-01), Kunz
patent: 3434282 (1967-04-01), Shelhart
patent: 3447496 (1969-06-01), Short
patent: 3476055 (1969-11-01), Crowther
patent: 3696613 (1972-10-01), Goodale
patent: 3747725 (1973-07-01), Feustel et al.
patent: 3935917 (1976-02-01), Eley
patent: 4138204 (1979-02-01), Bruguera
patent: 4171188 (1979-10-01), Anderson
patent: 4237926 (1980-12-01), Walker
patent: 4345881 (1982-08-01), Petersson
patent: 4470427 (1984-09-01), Maillochaud
patent: 4512722 (1985-04-01), Mouton
patent: 4531359 (1985-04-01), Hitzelberger et al.

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