It is composed of main valve and pilot valve. The main valve is mainly composed of valve seat, main valve disc, piston, spring and other parts. The pilot valve is mainly composed of valve seat, disc, diaphragm, spring, regulating spring and other parts.

By adjusting and adjusting the spring pressure to set the outlet pressure, using the diaphragm to sense the outlet pressure change, and driving the piston through the pilot valve to adjust the size of the flow area of the throttle part of the main valve, the pressure reducing and stabilizing function is realized. This product is mainly used in gas pipeline, such as air, nitrogen, oxygen, hydrogen, liquefied gas, natural gas and other gases.