Hydraulic pressure reducing control valve

Details Hydraulic pressure reducing control valve Hydraulic pressure reducing control valve

1985-03-26

1986-03-18

Cohan, Alan

Fluid handling

Systems

Programmer or timer

13762564, 13762566, 13762569, G05D 1600

Patent

active

045762007

ABSTRACT:
A hydraulic pressure control valve includes a spool which has a first end having a first cross-sectional area. The opposite end of the spool has a reduced cross-sectional area. Modulated pressure is provided to a chamber at the first end of the spool and when it increases beyond the force of a biasing spring, an inlet port is connected to an outlet port. Feedback pressure acts on the differential area between a full cross-sectional area of the spool and a reduced area portion of the spool located within the outlet port. The feedback force on the spool is in proportion to the changing control force. A sleeve is provided at the end of the valve adjacent the reduced area portion of the spool, such portion and sleeve cooperating to provide a sliding seal. The outlet port will be coupled to tank whenever the modulated pressure falls below the combination of the spring force and the feedback pressure.

REFERENCES:
patent: 3454026 (1969-07-01), Orme
patent: 3592211 (1971-07-01), Spalding
patent: 3802453 (1974-04-01), Fleury
patent: 3856047 (1974-12-01), Takayama
patent: 3990352 (1976-11-01), Nisheda
patent: 4524804 (1985-06-01), Goedecke

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