Working principle of pressure reducing valve

Oct 12,2021

The pressure reducing valve is a special device that automatically reduces the working pressure of the pipeline. It can reduce the higher water pressure in the pipeline before the valve to the level required by the pipeline after the valve. Pressure reducing valves are widely used in high-rise buildings, areas where the water pressure of the urban water supply pipe network is too high, mines and other occasions to obtain appropriate service water pressure and flow at each water point in the water supply system. In view of the fact that the water leakage rate and the degree of waste are almost proportional to the water pressure of the water supply system, the pressure reducing valve has system operating conditions and potential water saving effects. According to statistics, its water saving effect is about 30%. In order to adjust the level of accuracy, this valve has a good installation effect.
There are many types of pressure reducing valves. In the past, the common ones are membrane type and internal spring piston type. The basic principle of the pressure reducing valve is to reduce the water pressure by the local resistance of the flow passage in the valve to the water flow. The range of the water pressure drop is automatically adjusted by the diaphragm connecting the valve flap or the water pressure difference between the inlet and outlet on both sides of the piston. In recent years, some new types of pressure reducing valves have appeared, such as fixed ratio pressure reducing valves, whose construction principle is shown in Figure 14.2-2. The principle of constant ratio pressure reduction is to use the water pressure ratio of the floating piston in the valve body to control. The pressure reduction ratio at the inlet and outlet ends is inversely proportional to the piston area ratio at the inlet and outlet sides. This kind of pressure reducing valve works smoothly without vibration; there is no spring in the valve body, so there is no concern about spring corrosion and metal fatigue failure; the sealing performance is good and does not leak, so it reduces both dynamic pressure (when water flows) and static pressure (flow rate is 0 o'clock); especially when decompression does not affect the water flow.

Hot Tags:

Shengfeng

PREVIOUS:

Troubleshooting of soft seal gate valve

NEXT:

Shengfeng Automation Appeared in Hangzhou Industry Fair to Bring Gospel to Smart Water Meter Industry