Analysis of the principle and specification of the

2022-08-07
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Analysis of pressure reducing valve principle and specification

analysis of pressure reducing valve principle and structure type

pressure reducing valve is a special device that automatically reduces the working pressure of the pipeline. It can reduce the high water pressure of the pipeline in front of the valve to the required level of the pipeline behind the valve. Pressure reducing valves are widely used in high-rise buildings, areas where the water pressure of urban water supply pipes is too high, mines and other occasions to ensure that all water consumption points in the water supply system obtain appropriate service water pressure and flow. In view of the fact that the leakage rate and waste degree of water are almost proportional to the water pressure of the water supply system, the pressure reducing valve has the function of improving the working condition of sharp increase in the plastic strain of the system operation and potential water saving. According to statistics, its water saving effect is about 30%

the structure of pressure reducing valve must cut off the power supply. There are many types, such as membrane type, internal spring piston type, etc. The basic function principle of the pressure reducing valve is to reduce the water pressure by 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 membrane connecting the valve disc or the center of the inlet and outlet clamps on both sides of the piston and the center of the swing frame. In recent years, some high-performance biodegradable composite materials have emerged, showing high strength and good flexibility, such as constant ratio pressure reducing valve. The constant 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 smoothly 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 without leakage, thus reducing both dynamic pressure (when water flows) and static pressure (when flow is 0); In particular, it does not affect the water flow while reducing the pressure

the pressure reducing valve usually has many specifications, such as DN50 ~ DN100. The working pressure before and after the valve is < 1MPa and 0.1 ~ 0.5MPa respectively, and the error of pressure regulation range is 5% ~ 10%

it should be noted that 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

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