Differential pressure control valve and variable displacement compressor having the differential pressure control valve

摘要

A differential pressure control valve has a valve seat, a valve body, and a guiding member. A valve hole through which fluid passes is formed in the valve seat. The valve body is located on the downstream side of the valve seat, and separates from or is seated on the valve seat in accordance with the pressure difference between the upstream side and the downstream side to selectively open and close the valve hole. The guiding member is fixed to the valve seat to guide the valve body. The valve seat is made of magnetic material. The valve body has a lid made of magnetic material and a guided member made of nonmagnetic material. The lid is seated on the valve seat to close the valve hole, and the guided member is guided by the guiding member. One of the valve seat and the lid has a permanent magnet. The valve body is urged in the direction approaching the valve seat by the magnetic pulling force of the permanent magnet. The permanent magnet is located at a position outside the area in which the valve body is seated on the valve seat.