Control valve apparatus and pressure circuit

Details Control valve apparatus and pressure circuit Control valve apparatus and pressure circuit

2007-02-13

2007-02-13

Jacyna, J. Casimer (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

Reexamination Certificate

active

11111754

ABSTRACT:
The control valve apparatus holds a seat valve member in a position seated on a valve seat to thereby prevent a backward flow even if the pressure in the inlet chamber side becomes lower than the pressure in the outlet chamber side. With a pilot control valve member is in a closed state, when the pressure in the inlet chamber is higher, a pressurized medium is introduced to the control pressure chamber via a first valve unit and is cut off from the outlet chamber by a second valve unit. When the pressure in the outlet chamber is higher, the pressurized medium is introduced to the control pressure chamber via the second valve unit and is cut off from the outlet chamber by the first valve unit.

REFERENCES:
patent: 1303045 (1919-05-01), Dieter
patent: 2758811 (1956-08-01), Peterson
patent: 3125319 (1964-03-01), Arbogast et al.
patent: 4019713 (1977-04-01), Deinlein-Kalb
patent: 4802505 (1989-02-01), Gemignani et al.
patent: 6644346 (2003-11-01), Conrads et al.
patent: 6802339 (2004-10-01), Conrads et al.
patent: 427401 (1992-05-01), None

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