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. Since the water loss rate and the degree of waste are almost proportional to the water pressure in 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 efficiency 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. Since 2007 there have been some new type of pressure reducing valve, such as constant proportional pressure reducing valve. 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 valve is usually DN15 ~ DN100 and other specifications, the valve before and after the working pressure were <1MPa and 0.1 ~ 0.5MPa, pressure regulating range of error is ± 5% ~ 10%.
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