COMPRESSED AIR DRYING SYSTEM AND CHECK VALVE USED IN COMPRESSED AIR DRYING SYSTEM

摘要

A compressed air drying system is provided with: a supercharger; a compressor to which the supercharger is connected; an elimination device that carries out loaded operation and unloaded operation; a pressure regulator that opens and closes a drain valve device by air pressure; and a check valve provided with a body having a first port connected to the compressor, a second port connected to the elimination device, and a third port connected to the pressure regulator, and a piston provided slidably within the body. The hardness of the material in the body for a sliding contact part in sliding contact with the piston differs from the hardness of the material for the piston.