公开(公告)号：CA2484609A1

公开(公告)日：2005-04-22

申请号：CA2484609

申请日：2004-10-13

Applicant: CONSERVAIR TECHNOLOGIES CO LLP

Inventor： TARANTO THOMAS F ,  WILSON ROBERT E

IPC: G05D7/06 ,  G05D16/20

Abstract: A compressed air control system has a plurality of air-conducting airwa ys connected between upstream and downstream headers. A control valve arrangeme nt utilizes a main analog flow control valve in one of the parallel airways and at least one digital trim valve in another of the parallel airways. The control and trim valves respond to pressure changes in the downstream header and ensure that the control valve never closes more than 25 percent and never opens beyond 75 percent so as to stabilize system pressure.