Reducing valve (valve) is the use of control valve body opening and closing parts of the opening to regulate the flow of media, the media pressure is reduced, with the help of the role of post-valve pressure regulator opening and closing parts, the valve pressure Maintained within a certain range, the import pressure is constantly changing circumstances, to maintain the export pressure within the set range, to protect the subsequent life of production equipment. For domestic water supply, fire water supply and other industrial water supply system, through the control valve decompression pilot valve, you can adjust the outlet pressure of the main valve. Export pressure does not change due to changes in inlet pressure and inlet flow. Export pressure is safely and reliably maintained at the set point, and the set value can be adjusted to achieve the purpose of reducing pressure as needed. The valve decompression precision, stable performance, safe, reliable, easy installation and adjustment, long service life. The basic performance of the pressure reducing valve Pressure regulating valve range: It refers to the output pressure of the relief valve P2 adjustable range, within the scope of this requirement to achieve the required accuracy. Regulating the pressure range and the main spring stiffness. Pressure relief valve pressure characteristics: It refers to the flow rate g is set value, due to input pressure fluctuations caused by the output pressure fluctuations. The smaller the output pressure fluctuation, the better the characteristics of the pressure reducing valve. The output pressure must be lower than the input pressure - the setting will not substantially change with the input pressure. Pressure reducing valve flow characteristics: It refers to the input pressure - timing, the output pressure with the output flow g changes in the holding capacity. When the flow rate g changes, the output pressure changes as small as possible. The lower the general output pressure, the smaller it fluctuates as the output flow changes. Pressure reducing valve selection principle: pressure relief valve inlet pressure fluctuations should be controlled at a pressure of 80% to 105% of the inlet pressure, such as over this range, the performance of the valve will be affected. Valve pressure is usually after the valve pressure Pc should be less than 0.5 times the pressure before the valve, that is, when using the pressure reducing valve Pc, is strictly prohibited random disturbing, self-disassembly. Otherwise, the tightness and pressure relief valve performance will be destroyed. This not only affects normal gas supply, but also creates the risk of a direct gas or gas leak with high pressure gas. Pressure relief valve not only from the role of decompression and regulators. Therefore, it is forbidden to block the "air outlet" of the pressure reducing valve during use. The design and selection of pressure reducing valve The type and specification of pressure reducing valve should be calculated and determined according to the pressure before the valve, pressure difference, flow rate, medium characteristics and other factors, and should not be directly determined by the pipe diameter of the upstream or downstream pipe. When a single pressure reducing valve can not meet the requirements of decompression, two pressure reducing valves should be connected in series. Pressure reducing valve should be set at both ends of the pressure gauge, the valve set before the filter, set the safety valve after the valve, bypass pipe and bypass valve should be set for easy maintenance.
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