| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a control valve for a variable displacement compressor in which leakage of refrigerant gas in a completely closed state is reduced. <P>SOLUTION: The variable displacement type swash plate compressor 1 can change a delivery capacity thereof by changing pressure of a crank chamber 5. The control valve CV controls pressure of the crank chamber 5 by changing opening of an air supply passage 7 connecting an oil separator 4 as a high pressure area with the crank chamber 5. In the control valve CV, a bearing surface 32a of a valve seat 32 and an open/close face 31a of a valve element part 31 for adjusting the opening of the air supply passage 7 are made of high-hardness materials. Case hardening by nickel phosphorus plating of material of the valve seat 32 is performed to form the bearing surface 32a of the valve seat 32 made of high-hardness material. Further, case hardening by salt bath nitriding of material of the valve element part 31 is performed to form the open/close face 31a of the valve element part 31 made of high-hardness material. <P>COPYRIGHT: (C)2004,JPO</p> |
