Hydraulic control apparatus with selectively operated check valv

Details Hydraulic control apparatus with selectively operated check valv Hydraulic control apparatus with selectively operated check valv

1993-08-20

1995-08-22

Ryznic, John E.

Motors: expansible chamber type

With motive fluid valve

Manual control carried on or operated from load or output...

91437, 92163, F15B 1108, F15B 1304, F01B 3100

Patent

active

054429927

ABSTRACT:
A hydraulic control apparatus for use with a hydraulically operated tool comprises a valve body operatively and having a valve bore defining an axis. The valve body also defines a pressure port and a return port for connecting the valve bore to a source of hydraulic fluid, and a cross port communicating between the valve bore and the hydraulic tool. A tubular conduit has one end in communication with the valve bore and an opposite end in communication with the hydraulic tool. A selector member is moveable between a first position for defining a passage communicating between the cross port and the opposite end of the tubular conduit to provide a return path for hydraulic fluid between the pressure port and the return port, and a second position for closing off this passage.

REFERENCES:
patent: 3882883 (1975-05-01), Droegemueller
patent: 4366673 (1983-01-01), Lapp
patent: 4548229 (1985-10-01), Johnson
patent: 4589437 (1986-05-01), Zeuner et al.

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