Pressure reducing valve is adjusted to reduce the inlet pressure to a required outlet pressure, and rely on the energy of the medium itself, so that the outlet pressure automatically maintain stable valve. From the point of view of fluid mechanics, pressure reducing valve is a local resistance can change the throttle element, that is, by changing the throttle area, the flow rate and fluid kinetic energy change, resulting in different pressure loss, so as to achieve the purpose of decompression. Then rely on the control and regulation system adjustment, so that the valve pressure fluctuation and spring force balance, so that the valve pressure in a certain range of error to maintain constant.
Pressure reducing valve is adjusted to reduce the inlet pressure to a required outlet pressure, and rely on the energy of the medium itself, so that the outlet pressure automatically maintain stable valve.
Pressure reducing valve is a special device to automatically reduce the working pressure of the pipeline. It can reduce the higher liquid pressure of the pipeline in front of the valve to the level required by the pipeline behind the valve. The main transport medium here is water. Pressure reducing valve is widely used in high-rise buildings, urban water supply network pressure is too high area, mines and other occasions, to ensure that the water supply system in the water point to obtain appropriate service pressure and flow.
In view of the water leakage rate and waste degree is almost proportional to the water pressure of the water supply system, so the pressure reducing valve can improve the operating conditions of the system and the potential water-saving effect, according to statistics, its water-saving effect is about 30%. There are many structural types of pressure reducing valves, such as 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. The scope of the water pressure drop is automatically adjusted by the film connected to the valve disc or the inlet and outlet water pressure difference on both sides of the piston.
The principle of constant ratio decompression is to use the floating piston in the valve body water pressure ratio control, the inlet and outlet end decompression ratio and the inlet and outlet side piston area ratio is inversely proportional, this pressure reducing valve works smoothly without vibration, making the domestic pressure reducing valve production technology to further improve; There is no spring in the valve body, so there is no spring corrosion, metal fatigue failure; Good sealing performance does not leak, so both reduce dynamic pressure (water flow) and static pressure (flow 0); Especially in the decompression at the same time does not affect the water flow. The pressure reducing valve usually has DN15 ~ DN100 and other specifications, the working pressure before and after the valve is <1MPa and 0.1 ~ 0.5mpa respectively, and the pressure regulating range error is ±5% ~ 10%.
JB/T2203-1999 "Pressure reducing valve structure length" mainly general class. At present, most domestic pressure reducing valve manufacturers are designed and produced according to this standard, but this standard is not perfect, the specifications are not complete. For example, the maximum nominal diameter of gas pressure reducing valve is DN500, and the maximum nominal diameter of water pressure reducing valve is DN1000. According to the specifications and information of the reducing valve produced by the manufacturer, the connection size of each manufacturer is not uniform, such as DN500 gas reducing valve, it is suggested that the General Machinery Research Institute revise JB/T2203-1999 "Pressure reducing Valve Structure Length". It is suggested that the design institute and users should choose according to the standard, and the pressure reducing valve manufacturers should design and manufacture according to the standard.
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