Patent ID: 6746214
Filing Date: 2004-06-08
Classification: F04B

Abstract:
A control valve of a variable displacement compressor including a suction passage in which refrigerant gas at a relatively low pressure flows, a discharge pressure zone in which the refrigerant gas compressed at a relatively high pressure flows, a crank chamber that accommodates a cam, and a supply passage that connects the discharge pressure zone to the crank chamber, wherein the control valve comprises:a body, which accommodates a valve body that opens or closes a valve hole connected to the supply passage; and a pressure sensitive portion, which is fixed to the body for detecting the pressure in the suction passage, and the pressure sensitive portion includes: a diaphragm, which is deformed in relation to the pressure in the suction passage; a first case, which has a first flange and cooperates with the diaphragm to define a pressure sensitive chamber; and a second case, which has a second flange that cooperates with the first flange to hold the diaphragm, wherein the outer periphery of the first flange is welded to the outer periphery of the second flange, wherein the body has a positioning surface for positioning the diaphragm by contacting the second case, and wherein the positioning surface is formed such that the interval between the diaphragm and the valve hole becomes a predetermined value.