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The working principle of air pressure reducing valve

The working principle of air pressure reducing valve

  • Categories:Industry news
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  • Time of issue:2020-09-19
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(Summary description)When the output pressure is lower than the set value, the force on the lower side of the piston of the air pressure reducing valve is greater than the force on the upper side, the piston moves upward, the valve cover is pushed up

The working principle of air pressure reducing valve

(Summary description)When the output pressure is lower than the set value, the force on the lower side of the piston of the air pressure reducing valve is greater than the force on the upper side, the piston moves upward, the valve cover is pushed up

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-09-19
  • Views:0
Information

1. When the output pressure is lower than the set value, the force on the lower side of the piston of the air pressure reducing valve is greater than the force on the upper side, the piston moves upward, the valve cover is pushed up, the regulating valve port increases, and the pressure entering the output cavity from the pressure regulating valve port The compressed air flow increases, and the pressure in the output chamber increases. When the pressure in the output chamber reaches the set value, the upper and lower sides of the piston are balanced, the piston stops moving upwards, the opening of the pressure regulating valve remains unchanged, and the pressure of the outlet compressed air And the flow rate remains stable.

2. When the output pressure is greater than the set pressure, the force on the upper side of the piston of the air pressure reducing valve is greater than the force on the lower side, and the valve cover and the piston move downward together, thereby reducing the opening of the pressure regulating valve port and reducing the passage of the regulator. The pressure valve port enters the gas flow into the output cavity, thereby reducing the pressure of the gas in the output cavity. If the pressure in the output cavity is still higher than the set value at this time, the piston continues to move downwards until the pressure regulating valve port is completely closed. At this time, the force of the spring on the valve cover no longer acts on the piston through the valve core, and the rubber pad at the bottom of the valve cover is tightly pressed on the port of the regulating valve and separates the path between the input cavity and the output cavity. At this time, if the output pressure is equal to the set pressure value, the piston stops moving. At this time, when the pressure regulating valve port and the overflow valve port are closed at the same time, the set pressure is the outlet pressure and the valve is in a static equilibrium state.

3. If the output pressure is still higher than the set pressure value, the piston continues to move downwards, the upper end surface of the valve core is separated from the bottom of the valve cover, the output cavity is connected 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 decreases, the pressure at the lower part of the piston of the air pressure reducing valve is greater than the pressure at the upper part, causing the piston and valve core to move upward in the axial direction and gradually close the opening of the overflow valve port. When the output pressure reaches the set pressure When the value is set, the overflow valve port is completely installed at the bottom of the valve cover, and the passage between the output cavity and the overflow cavity is separated, and the overflow is stopped. At this time, the overflow valve port and the pressure regulating valve port are closed at the same time. The valve is in a static equilibrium state, and the gas stops flowing. Because the pressure on the upper and lower sides of the valve cover is in equilibrium, no matter how the inlet pressure fluctuates, it will not affect the pressure balance of the valve, so as to ensure that the outlet pressure remains stable at the set value. , So that the valve has good pressure characteristics.

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