Pressure reducing valve for dead engine lowering

Details Pressure reducing valve for dead engine lowering Pressure reducing valve for dead engine lowering

1983-03-16

1985-04-09

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Plural actuators for single valve means

91461, 1376256, F15B 1108, F15B 13042

Patent

active

045094063

ABSTRACT:
A fluid system (10) having a directional control valve (12) operated by a pilot valve (11) having a manually operable control handle (22) for selectively controlling a fluid motor (14) in positioning a load (17). The pilot valve (11) includes a spool (31) cooperating with associated portions of the pilot valve to provide a pressure regulated pilot signal to the directional control valve during normal operation of the system. Spool (31) includes a recess (98) which is placed in communication with the high pressure portion of the motor cylinder (16) during a dead engine condition by manipulation of handle (22) to provide pressure regulated delivery of the fluid from the motor (14) through recess (98) and to the conduit normally controlling the directional control valve for effecting a controlled lowering or retraction of the load. A single pilot valve is utilized for effecting the pressure regulated control in both normal and dead engine conditions.

REFERENCES:
patent: 3620129 (1971-11-01), Fruehauf
patent: 3698415 (1972-10-01), Forster et al.
patent: 3766944 (1973-10-01), Distler
patent: 3840049 (1974-10-01), Field, Jr.
patent: 3935792 (1976-02-01), Dezelan et al.
patent: 3987703 (1976-10-01), Latimer
patent: 4184512 (1980-01-01), Pigndlet

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