The pressure relief Valve pneumatic control valve is an essential accessory, a major role in the pressure of the gas source decompression and stability to a fixed value, in order to control valves to obtain a stable gas source power is used to adjust the control.

Structure can be divided into the diaphragm spring diaphragm type, piston, leveraged, and the corrugated tube; seat the number of man-made single-seat and seat type; the position of the valve can be divided into positive-acting and reaction type

The pressure relief Valve by the pressure in the valve control. When the pressure sensor to the valve pressure is detected instructions increases, the pressure reducing valve valve opening decreases; reduced pressure when the detected pressure reducing valve, pressure reducing valve valve opening increases to meet the control requirements.

Pressure relief valve - the valve pressure relief must be to some extent, higher than the system value; even when the maximum or minimum flow, it also should be able to make a positive effect or reaction control signal response. These valves should be useful for the control of selection, ie, the maximum flow rate of 20% to 80%. Has the geometric characteristics of geometric type, or normal. These types of valves with proportional control flow characteristics and flow range.

Many different types of valve: pilot piston valve, membrane valve, bellows valve, proportional valve, self-operated pressure reducing valve, direct role in the piston valve The back pressure valve. They are applicable to different media.

The different forms have different specific works. But the general principle: pressure reducing valve is reduced to a desired outlet pressure through the opening and closing parts of the throttle, the inlet pressure and outlet pressure remained stable. But generally reducing valve pressure drop must be