Combined unloading and relief valve for pump unloading circuit

Details Combined unloading and relief valve for pump unloading circuit Combined unloading and relief valve for pump unloading circuit

1976-02-27

1977-04-12

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Manual actuation of condition responsive valve

137495, 13759612, 60494, 251 78, 417440, F04B 4902, F16K 3114

Patent

active

040172210

ABSTRACT:
A hydraulic fluid circuit comprises an engine-driven pump for communicating pressurized fluid through a combined unloading and relief valve and to an implement control circuit of a construction vehicle. Actuating means are provided for selectively opening the valve during engine start-up to reduce fluid pressure in the valve and implement control circuit to a first predetermined level. An override means is operatively connected to the actuating means for preventing the valve from opening when the fluid pressure exceeds a second predetermined and operating level which is higher than the first predetermined level.

REFERENCES:
patent: 2726680 (1955-12-01), Baines
patent: 3150685 (1964-09-01), Lohbauer et al.
patent: 3183977 (1965-05-01), Heckenkamp et al.
patent: 3303647 (1967-02-01), Futamata
patent: 3522999 (1970-08-01), Liles
patent: 3699678 (1972-10-01), Swanson et al.
patent: 3865514 (1975-02-01), Lonnemo

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