Gas pressure regulator - has built in indicator which shows maximum operating pressure condition to avoid overload of the control diaphragm

摘要

A ring seal poppet is mounted on a central valve spindle and seats against an annular insert to separate input and output chambers. Output pressure is transmitted to the underside of the control diaphragms through a pick-off tube located in the outlet chamber. An intermediate diaphragm separates the inlet from the control chamber. The regulator setting is effected by pre-loading a bias coil spring against the control diaphragm using a threaded nut. For visual indication the control diaphragm displaces a pin screwed into a stem, the top surface of which is viewed through a transparent cap. ON and OFF markings are located on the outer surface of the cap.