Pilot valves for two-stage hydraulic devices

Details Pilot valves for two-stage hydraulic devices Pilot valves for two-stage hydraulic devices

1984-05-30

1986-10-07

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13759617, 13762564, 13762565, 13762568, F15B 13043

Patent

active

046153586

ABSTRACT:
A solenoid-operated pilot valve for a two stage hydraulic device comprises a spool (4) slidably mounted in a housing for movement in opposite directions from a normal null position in order to deliver fluid under pressure to the second stage (2) of the device to actuate the latter in one direction or an opposite direction from a normal null position, the spool (4) being formed with two passageways (27,28) each extending internally of the spool (4) between one end face (15) of the latter and the periphery of the spool, and the pilot valve further comprising two spool control devices (13), at least one of which is a solenoid, associated with respective ends of the spool and in normal operation seating against the end faces (15) of the spool so as to close the passageways against fluid flow therethrough, but becoming unseated in the event of an interruption in the electrical input to the solenoid, whereby both ends of the second stage are at a common pressure so as quickly to relieve the pressure in the second stage of the device, thereby permitting fast return of the latter to the null position.

REFERENCES:
patent: 2591800 (1952-04-01), Gardiner
patent: 3450160 (1969-06-01), Tess
patent: 3851285 (1974-11-01), Rothfuss et al.
patent: 4245671 (1981-01-01), Kosugui
patent: 4266572 (1981-05-01), Schuttenberg et al.

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