Pressure relieve valve for railway air pressure brakes

摘要

The pressure relief valve has a housing (1) with a chamber (14) in which a moving piston (21) is arranged. The piston has a concentric hole (24) which forms a valve seat with a piston rod of another piston (10). The piston is pressurized by a spring in a closing direction of the valve seat. Another valve seat (11) is bridged by a calibrated flow-limitation opening (19), working as a bypass.