Proportional pilot-operated flow control valve

Details Proportional pilot-operated flow control valve Proportional pilot-operated flow control valve

2005-11-22

2005-11-22

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

C137S501000

Reexamination Certificate

active

06966329

ABSTRACT:
A proportional, pilot-operated flow control valve is disclosed which can include a cage, a hollow compensating spool slidably disposed within the cage, a hollow metering guide member slidably disposed within the compensating spool, a regulating spool slidably disposed within the guide member, a dampening guide slidably disposed inside the compensating spool to define a dampening chamber, a compensating spring disposed inside the dampening chamber and arranged to urge the dampening guide to engage the metering guide and the compensating spool to engage the cage, a regulating spring disposed inside the regulating spool and urging the regulating spool to abut the dampening guide, and a cartridge, the cartridge having a pilot valve assembly and an adaptor, the adaptor mounted to the cage, the pilot valve assembly mounted to the adaptor, the pilot valve assembly including an actuator.

REFERENCES:
patent: 3596677 (1971-08-01), Clark et al.
patent: 4121610 (1978-10-01), Harms et al.
patent: 4462566 (1984-07-01), French
patent: 5000220 (1991-03-01), Eick et al.
patent: 6167906 (2001-01-01), Liberfarb

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