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Is used to control the opening and closing of the valve body opening to regulating the flow of media, media pressure, use valve pressure regulating opening and closing after opening, keep the valve after the pressure in a certain range, in the inlet pressure of the ever-changing circumstances, maintain outlet pressure setting range, protecting the production apparatus.

Gas pressure reducing valve is a must-have accessory of pneumatic control valve, the main role is air pressure-relief and stability to a fixed value, in order to adjust the gas valve to obtain a stable source of power for control.

Film structure can be divided into the diaphragm, spring type and the piston type, lever and bellows; according to the number of seats can be divided into one-seater and two-seater; according to the valve position can be divided into positive action and reaction.