Priority control valve

Details Priority control valve Priority control valve

1973-09-10

1976-09-14

Croyle, Carlton R.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60484, 91412, 137101, F15B 1518

Patent

active

039799077

ABSTRACT:
A priority control valve for the priority steering control and the auxiliary circuits of the hydraulic system of a fork lift truck or the like characterized in that the housing interchangeably accommodates different priority flow control spools according to the type of steering control valve which is used i.e. a closed center steering control valve with a variable meter-in orifice in the pressure feed circuit or a closed center steering control valve with a variable meter-out orifice in the steering cylinder return circuit or an open center steering control valve with an orifice in the priority flow divider spool to determine the priority circuit flow by controlling a variable displacement pump when the priority circuit itself is operated or when the priority circuit load pressure is greater than the load pressure of the auxiliary circuit.

REFERENCES:
patent: 2827768 (1958-03-01), Ziskal et al.
patent: 2892311 (1959-06-01), Gerpen
patent: 2892312 (1959-06-01), Allen et al.
patent: 3334705 (1967-08-01), Lam
patent: 3391537 (1968-07-01), Smith
patent: 3410295 (1968-11-01), Malott
patent: 3470694 (1969-10-01), Budzich
patent: 3543516 (1970-12-01), Treichel
patent: 3584538 (1971-06-01), Peterson
patent: 3662548 (1972-05-01), Suzuki et al.
patent: 3703186 (1972-11-01), Brewer
patent: 3726093 (1973-04-01), Malott
patent: 3760830 (1973-09-01), Fritzsche et al.

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