Proportional flow control valve

Details Proportional flow control valve Proportional flow control valve

1985-10-23

1986-04-29

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

25112908, 13761411, F16K 3140, F16K 3142, F16K 31128

Patent

active

045852065

ABSTRACT:
A proportional flow control valve is disclosed in which an opening of a variable orifice formed by a proportion solenoid and a pilot spool is varied to vary a flow rate of fluid in a restriction passage by-passing a plunger of a main control portion connected to the variable orifice and hence a pressure difference across the plunger to thereby vary a position of the plunger. The pilot spool is inserted into a sleeve and has one end formed with a poppet portion which is able, with an aid of a spring, to contact with a valve seat formed in one end of the sleeve. The pilot spool is by-passed by a restriction passage and the poppet portion becomes in intimate contact with the valve seat when a force of the proportion solenoid in zero and the variable orifice is opened and connected through the poppet portion and the restriction passage to a drain when the pilot spool is moved by the force of the proportion solenoid.

REFERENCES:
patent: 2755058 (1956-07-01), Margrave
patent: 3250293 (1966-05-01), Adams et al.
patent: 3667722 (1972-06-01), Katz et al.
patent: 4478245 (1984-11-01), Bender
patent: 4553732 (1985-11-01), Brundage et al.

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