Patent ID: 7284471
Filing Date: 2007-10-23
Classification: F15B,G05D

Abstract:
1. A pressure control valve for regulating pressure within a servo system, said pressure control valve comprising: a valve body having return and pressure inlet and outlet ports formed therein, as well as first and second feedback ports, for fluidly communicating with an interior cavity of said valve body; a return spool freely supported within said valve body and configured to regulate fluid flow through said return inlet and outlet ports; a pressure spool, independent of said return spool, and freely supported within said valve body opposite said return spool, said pressure spool configured to regulate fluid flow through said pressure inlet and outlet ports; an intrinsic mechanical feedback system configured to displace said return and pressure spools in response to a pressure differential created between a pilot pressure and a feedback force concurrently acting on said return and pressure spools, respectively, said intrinsic mechanical feedback system functioning to dissipate said pressure differential in an attempt to equalize said pilot pressure and said feedback force; and limiting means located within said valve body configured to establish limiting positions of said return and pressure spools within said valve body during operation.