Directional control valve with pilot operated poppet valves

Details Directional control valve with pilot operated poppet valves Directional control valve with pilot operated poppet valves

1993-04-28

1994-11-08

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91461, 13759615, F15B 1108, F15B 1304

Patent

active

053616790

ABSTRACT:
Shown is a direction control valve (16) for use in a hydraulic control system having a source of hydraulic pressure (P) and a return passageway (50). The control valve includes a first hydraulic flow pathway (140, 142) and a second hydraulic flow pathway (144, 146). A two-position valve (38) includes four ports (48, 58, 64, 74). First and second pilot-operated poppets (88, 90) each have a pilot chamber (84, 86). When the valve (38) is in its first position, the source of hydraulic pressure (P) is provided to the pilot chamber (86) of the first poppet (88) and the pilot chamber (84) of the second poppet (90) is connected to the return pathway (50). As a result, one hydraulic flow pathway (140, 142) is open and the other hydraulic flow pathway (144, 146) is closed.

REFERENCES:
patent: 3556144 (1971-01-01), Bickers et al.
patent: 3831725 (1974-08-01), Schott
patent: 4083381 (1978-04-01), McClocklin et al.
patent: 4149565 (1979-04-01), Jennings et al.
patent: 4201116 (1980-05-01), Martin
patent: 4611528 (1986-09-01), Nanda et al.
patent: 5076537 (1991-12-01), Mears, Jr.
patent: 5117869 (1992-06-01), Kolchinsky
patent: 5156184 (1992-10-01), Kolchinsky

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