The compressed air with pressure P1 is input from the left end and throttled by valve port 10, and the pressure drops to P2 output. The size of P2 can be adjusted by adjusting springs 2 and 3. Rotate the knob 1 clockwise, compress the springs 2, 3 and the diaphragm 5 to move the valve core 8 down, and increase the opening of the valve port 10 to increase P2. If the knob 1 is turned counterclockwise, the opening of the valve port 10 decreases, and P2 decreases accordingly.

If P1 rises instantaneously, P2 will rise accordingly, causing the pressure in the diaphragm chamber 6 to increase, and the thrust generated on the diaphragm 5 will increase accordingly. This thrust destroys the balance of the original force and causes the diaphragm 5 to move upward. Moving, a small part of the air flow is discharged through the overflow hole 12 and the exhaust hole 11. As the diaphragm moves up, due to the action of the return spring 9, the valve core 8 also moves upward, closing the intake valve port 10.

The throttling effect is increased to reduce the output pressure until a new balance is reached, and the output pressure basically returns to the original value. If the input pressure drops instantaneously, the output pressure also drops, the diaphragm 5 moves down, the spool 8 moves down accordingly, the intake valve port 10 opens, the throttling effect is reduced, and the output pressure basically returns to its original value. Turn the knob counterclockwise

The adjusting springs 2 and 3 are relaxed, the thrust of the gas acting on the diaphragm 5 is greater than the force of the pressure adjusting spring, the diaphragm is bent upwards, and the inlet valve port is closed by the action of the return spring 10. Turn knob 1 again, the inlet valve The top end of the core 8 and the overflow valve seat 4 will disengage, and the compressed air in the diaphragm air chamber 6 will be discharged through the overflow hole 12 and the exhaust hole 11, so that the valve is in a state of no output.

In short...Adjust the spring to change the output pressure within a certain range. In order to prevent the pollution of the surrounding environment caused by a small amount of gas from the above overflow type pressure reducing valve, a pressure reducing valve without an overflow valve (that is, an ordinary pressure reducing valve) can be used.