Briefly describe the pressure regulating steps and main functions of pressure reducing valve

Briefly describe the pressure regulating steps and main functions of pressure reducing valve

Voltage regulation steps

1. Close the gate valve in front of the pressure reducing valve and open the gate valve behind the pressure reducing valve to create the downstream low-pressure environment;

2. Turn the adjusting screw counterclockwise to the uppermost position (relative to the lowest outlet pressure), and then close the gate valve behind the pressure reducing valve;

3. Slowly open the gate valve in front of the pressure reducing valve until it is fully open;

4. Slowly rotate the adjusting screw clockwise to adjust the outlet pressure to the required pressure (subject to the gauge pressure behind the valve); After adjustment, lock it

Lock the nut and open the gate valve behind the pressure reducing valve;

5. If the outlet pressure is higher than the set pressure during adjustment, it must be readjusted from the first step, that is, it can only be adjusted from low pressure to high pressure.

Main function of pressure reducing valve

The function principle of the pressure reducing valve is to reduce the water pressure by relying on the local resistance of the flow channel in the valve to the water flow. The range of water pressure drop is automatically adjusted by the film connecting the valve disc or the water pressure difference between the inlet and outlet on both sides of the piston. The constant ratio pressure reduction principle is controlled by the water pressure ratio of the floating piston in the valve body. The pressure reduction ratio at the inlet and outlet side is inversely proportional to the area ratio of the piston at the inlet and outlet side. The pressure reducing valve works stably without vibration; There is no spring in the valve body, so there is no fear of spring corrosion and metal fatigue failure; Good sealing performance and no leakage, so it can reduce both dynamic pressure (when water flows) and static pressure (when flow is 0); In particular, it does not affect the water flow while reducing pressure.

Although the water flow through the pressure reducing valve has a great head loss, it is still energy-saving in general because it reduces the waste of water, makes the system flow distribution reasonable, and improves the system layout and working conditions. When the medium is steam, the pilot piston pressure reducing valve or the pilot bellows pressure reducing valve should be selected. For the convenience of operation, adjustment and maintenance, the pressure reducing valve shall generally be installed on the horizontal pipeline.