Fuid compressor and heat pump type refrigeration system

摘要

A switching valve (12) comprises a valve body (13) to which a plurality of fluid passages are connected, a slider (25) having a gas passage (32) capable of selectively connecting two fluid passages, a balance port (33) for letting the gas passage communicate with the outside of the slider, a pilot valve (43) for opening and closing the balance port, a moving mechanism (50) for moving the pilot valve and the slider as one body in a predetermined direction alone, and a forwardly and reversely rotatable motor unit (3) for driving the slider to open the balance port, thereby canceling a pressure difference between the inside and outside of the slider and then moving the slider to switch the fluid passages.