Unlockable check valve, particularly for use as recovery and set

Details Unlockable check valve, particularly for use as recovery and set Unlockable check valve, particularly for use as recovery and set

1980-11-14

1982-11-30

Nilson, Robert G.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

F15B 1526

Patent

active

043610757

ABSTRACT:
An improved valve in use for underground mining in connection with a piston cylinder unit, such as a hydraulic prop, is disclosed. The valve includes a piston member within a control chamber which is operative to terminate fluid communication between the hydraulic prop and a hydraulic fluid source. The piston is pressure-equalized in a neutral position when the hydraulic prop is set.

REFERENCES:
patent: 2926634 (1960-03-01), Falendysz
patent: 3587399 (1971-06-01), Parquet

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