Patent ID: 8182239
Filing Date: 2012-05-22
Classification: F04B,F16K,G05D

Abstract:
1. A control valve comprising: a pressure sensitive part; a solenoid part; and a valve portion including a valve element provided on a moving member and a valve seat, wherein the valve element, which opens in relation to the valve seat, is adjusted by movement of the moving member, said movement resulting from biasing forces imparted to said moving member; a diaphragm holding body and a diaphragm assembly being disposed in a pressure sensitive chamber, said pressure sensitive chamber being partially defined by a casing in said pressure sensitive part; wherein said diaphragm holding body is engagingly held against said diaphragm assembly by a spring member disposed at an external periphery of the diaphragm holding body; said diaphragm assembly comprising at least one diaphragm unit, said at least one diaphragm unit providing an elastic force and being comprised of two symmetrically arranged diaphragm unit halves bonded only to one another and enclosing a sealed void; said at least one diaphragm unit further comprising a radial periphery having an external peripheral portion, said external peripheral portion being surrounded by the diaphragm holding body; wherein the at least one diaphragm unit is disposed between the diaphragm holding body and the casing and includes a center portion in direct contact with a center of the diaphragm holding body; wherein a thrust from the at least one diaphragm unit imparts a first biasing force to said moving member via said diaphragm holding body, said thrust being generated in accordance with a pressure in the pressure sensitive chamber which acts on an effective pressure receiving surface area of said at least one diaphragm unit; and wherein a solenoid thrust imparts a second biasing force to said moving member in accordance with an input signal from said solenoid part, said second biasing force operating in coordination with said first biasing force.