Proportional pressure reducing and relieving valve

Details Proportional pressure reducing and relieving valve Proportional pressure reducing and relieving valve

1993-11-18

1995-01-03

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762568, F15B 13044

Patent

active

053777204

ABSTRACT:
A hydraulic pressure reducing and relieving valve has a body with input, control and relief ports, a tubular spool slidably received within the body for selectively providing communication between the ports, and a tubular quill within the spool which the spool can slide over. The quill has a lumen which provides communication from one end of the spool to the other, so as to pressure balance the spool with relief pressure, and together with the spool defines a feedback chamber in communication with the control port which generates a force on the spool which opposes the operating force exerted on the spool by a solenoid. The spool may also be biased by a spring in the feedback chamber.

REFERENCES:
patent: 4917150 (1990-04-01), Koch et al.
patent: 5184644 (1993-02-01), Wade
patent: 5299600 (1994-04-01), Aronovich
Applicant's Exhibit 1, page entitled "Atos spa" Proportional pressure reducing valves type RZE, Table F010-4/E and attached sketch, admitted prior art.

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