How to adjust the pressure reducing valve of water meter

A valve that reduces the inlet pressure to the required outlet pressure by adjusting the pressure reducing valve and automatically keeps the outlet pressure stable by relying on the energy of the medium itself.

Principle of action:

The function of the pressure reducing valve is to reduce the water pressure through the local resistance of the flow passage in the valve, and the range of water pressure reduction is automatically adjusted through the water pressure difference between the diaphragm connecting the valve disc or the inlet and outlet on both sides of the piston. The principle of constant pressure reduction is controlled by the water pressure ratio of the floating piston in the valve body, and the pressure reduction ratio at the inlet and outlet ends is inversely proportional to the area ratio of the piston at the inlet and outlet sides.

This pressure reducing valve works smoothly without vibration; There is no spring in the valve body, so there is no need to worry about spring corrosion and metal fatigue failure; Good sealing performance, no leakage, reducing both dynamic pressure (when water flows) and static pressure (when the flow rate is 0); In particular, the pressure is reduced without affecting the water flow.

Extended data:

Internal structure of pressure reducing valve:

1, automatic adjustment principle of combined pressure reducing valve:

Combined pressure reducing valve is a kind of pressure reducing valve which can adjust itself by water pressure under complex and changeable working conditions, and keep the outlet pressure and flow rate stable when the inlet pressure and flow rate change. It is fully self-controlled, simple to debug and reliable to run.

2. Double feedback switching principle of combined pressure reducing valve:

The feedback system of combined pressure reducing valve is an independent system to control the flow area (throttle cone opening) according to the change signal of pressure reducing valve outlet. The pressure reducing valve is equipped with dual feedback systems which are mutually standby. Enabling system A means disabling the operation mode of system B, which can achieve the purpose of non-stop maintenance of pressure reducing valve.

3. Working principle of backwashing and blowdown of combined pressure reducing valve:

The operation conditions of hydropower stations are complex, especially the water quality is directly related to the safe operation of equipment. For hydropower stations with high sediment concentration, in addition to surfacing welding stainless steel and nickel-based alloy at the overflow position of the pressure reducing valve to prevent wear, the blowback device of the pressure reducing valve can also effectively prevent the blockage of the feedback control system and keep the pressure reducing valve in good working condition in water with sediment and impurities.

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