Valve units for use in hydraulic control systems of mining equip

Motors: expansible chamber type – With motive fluid valve – Inlet check valve with means for disconnectable supply line

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Details

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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