Pump unloading valve for use in agricultural tractor lift system

Details Pump unloading valve for use in agricultural tractor lift system Pump unloading valve for use in agricultural tractor lift system

1977-08-01

1979-02-27

Geoghegan, Edgar W.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

251 28, 251 635, 251122, 251 63, F15B 1108, F16K 31122

Patent

active

041412834

ABSTRACT:
An unloading valve spool with a tapered nose section is urged across a pair of unloading ports at a controlled rate eliminating violent upstream pressure generation. The unloading valve is subjected to equal system fluid pressure on each side of it as the spool is provided with a through passage that is dead headed on the back side of the unloading spool. A return spring urges the unloading spool to a normally closed position. An unloading piston prevents the unloading spool from closing too rapidly preventing the generation of a significant upstream pressure spike.

REFERENCES:
patent: 2020773 (1935-11-01), Ernst
patent: 2756771 (1956-07-01), Spencer
patent: 2905190 (1959-09-01), Oyster
patent: 3285287 (1966-11-01), Curran

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