Valve units for use in hydraulic control systems of mining equip

Details Valve units for use in hydraulic control systems of mining equip Valve units for use in hydraulic control systems of mining equip

1991-04-10

1992-11-03

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Inlet check valve with means for disconnectable supply line

91449, 91469, 137901, F15B 1108, F15B 1304

Patent

active

051598728

ABSTRACT:
A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of an appliance such as a prop. A auxiliary valve is mounted in the block and is operated manually to relieve the working chamber even if the non-return valve remains closed.

REFERENCES:
patent: 3948147 (1976-04-01), Sauer et al.
patent: 4088151 (1978-05-01), Schurger
patent: 4214607 (1980-07-01), Bouteille
patent: 4461449 (1984-07-01), Turner
patent: 4549565 (1985-10-01), Short
patent: 4694862 (1987-09-01), Rott
patent: 4941504 (1990-07-01), Beauvir

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