A pressure relief valve is a special device that automatically reduces the working pressure on the line by reducing the higher water pressure in the line before the valve to the level required by the line after the valve. Pressure relief valve is widely used in high-rise buildings, urban water supply pipe network pressure over the area, mines and other occasions to ensure that the water supply system water points to obtain appropriate service pressure and flow. Because the water loss rate and waste degree are almost proportional to the water pressure of the water supply system, the pressure reducing valve has the effect of improving system operation and potential water saving. According to the statistics, the water saving effect is about 30%. Many types of pressure relief valve structure, the previous common thin-film, such as the spring-piston. The basic principle of the valve is to reduce the water pressure by the local resistance of the flow channel in the valve. The range of the water pressure drop is automatically adjusted by the pressure difference between the inlet and outlet of the film or piston connected with the valve flap. In recent years there have been some new type of pressure reducing valve, such as the constant pressure reducing valve, the structure of the principle shown in Figure 14.2-2. Constant pressure than the principle of decompression is the use of valve body floating piston hydraulic ratio control, import and export side decompression ratio and the import and export of piston area ratio is inversely proportional. This valve works smoothly without vibration; there is no spring in the valve body, so there is no spring rust, metal fatigue failure considerations; good sealing performance without leakage, so both under pressure (water flow) and then the static pressure 0 o'clock); Especially in the decompression does not affect the water flow. Pressure reducing valves usually have DN50 ~ DN100 and other specifications, the working pressure before and after the valve are <1MPa and 0.1 ~ 0.5MPa respectively, and the error range of pressure regulating is ± 5% ~ 10%. It should be noted that although water flow through the pressure relief valve has a large head loss, it is generally energy efficient due to reduced water wastage and reasonable system flow distribution and improved system layout and operating conditions.
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