The gas pressure reducing valve is to control the opening of the opening and closing parts in the valve body to adjust the flow of the medium, reduce the pressure of the medium, and at the same time adjust the opening of the opening and closing parts with the help of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range, and spray cooling water in the valve body or behind the valve to reduce the temperature of the medium, this valve is called pressure reducing and desuperheating valve. The gas pressure reducing valve produced by Shanghai Xuangong Valve Factory is mainly for oxygen, hydrogen, ammonia, air, nitrogen, carbon dioxide and other gases. The valve is characterized by keeping the outlet pressure and temperature values within a certain range when the inlet pressure is constantly changing. The pressure reducing valve is a necessary accessory of the pneumatic control valve, which is mainly used to reduce the pressure of the air source and stabilize it to a fixed value, so that the control valve can obtain stable air source power for regulation and control. This type of valve should generally be installed horizontally in the pipeline.
Gas pressure reducing valves
1. The working principle of the gas pressure reducing valve
1. When the output pressure is lower than the set value, the force on the lower side of the piston is greater than that on the upper side, the piston moves upward, pushes the valve cover upward, increases the pressure regulating valve port, and increases the flow of compressed air entering the output cavity from the pressure regulating valve port, and the pressure of the output cavity rises. When the pressure of the output cavity reaches the set value, the force on the upper and lower sides of the piston is in a balanced state, the piston stops moving up, and the opening of the regulator valve port remains unchanged. The pressure and flow rate of the compressed air output from the output port remain stable.
2. When the output pressure is higher than the set pressure, the force on the upper side of the piston is greater than that on the lower side, and the valve cover and the piston move down together, so that the opening of the pressure regulating valve port decreases, and the flow rate of the gas entering the output cavity through the pressure regulating valve port decreases, and the pressure of the gas in the output cavity decreases. If the pressure in the output chamber is still higher than the set value, the piston continues to move down until the regulator port is completely closed. At this time, the force of the spring on the bonnet no longer acts on the piston through the valve core, but makes the rubber gasket on the bottom surface of the bonnet tightly pressed on the regulator valve port, and the passage between the input cavity and the output cavity is isolated. At this point, if the output pressure is equal to the set pressure value, the piston stops moving. At this time, the set pressure is the outlet pressure when the regulator port and the relief valve port are closed at the same time, and the valve is in static equilibrium.
3. If the output pressure is still higher than the set pressure value, the piston continues to move downward, the upper face of the valve core, that is, the relief valve port, is separated from the bottom surface of the valve cover, the output cavity is communicated with the overflow cavity, and the gas in the output cavity is discharged through the overflow valve port. As the pressure in the output chamber drops, the pressure on the lower side of the piston is higher than that on the upper side, so that the piston and the valve core move up along the axial direction and gradually close the opening of the small relief valve port. When the output pressure reaches the set value, the relief valve port is completely attached to the bottom surface of the valve cover, the passage between the output cavity and the overflow cavity is cut off, and the overflow stops. At this time, the relief valve port and the pressure regulating valve port are closed at the same time, and the valve is in static equilibrium when the gas stops flowing. Because the air pressure on the upper and lower sides of the valve cover is in a state of mutual counterbalance, no matter how the pressure of the inlet fluctuates, it cannot affect the pressure balance in the valve, so that the outlet pressure can always be stable at the required set value, so that the valve has good pressure characteristics.
Second, the model selection standard of gas pressure reducing valve
Select the type and pressure regulation accuracy of the pressure reducing valve according to the use requirements, and then select its diameter according to the required large output flow. When determining the air source pressure of the valve, it should be greater than the high output pressure of 0.1MPa. The pressure reducing valve is generally installed after the water distribution filter, before the oil mist or valuer, and be careful not to reverse its inlet and outlet; When the valve is not in use, the knob should be relaxed, so as to avoid the diaphragm often deformed by pressure and affect its performance.
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