Pressure reducing valve principle and application and performance category

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The pressure reducing valve is a valve that regulates the inlet pressure to a certain desired outlet pressure and relies on the energy of the medium to keep the outlet pressure automatically stable. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element whose local resistance can be changed. That is, by changing the area of ​​throttling, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of decompression. Then, depending on the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve is kept constant within a certain error range.

Pressure Reducing Valve Performance Category (1) Pressure Regulating Range: It refers to the adjustable range of pressure reducing valve output pressure P2. Within this range, the required accuracy is required. The pressure regulation range is mainly related to the stiffness of the pressure regulating spring.

(2) Pressure characteristics: It refers to the characteristic that the output pressure fluctuates due to input pressure fluctuation when the flow g is constant. The smaller the output pressure fluctuations, the better the relief valve characteristics. The output pressure must be lower than the input pressure - the set value does not change substantially with the input pressure.

(3) Flow characteristics: It refers to the input pressure - timing, output pressure changes with the change in the output flow g. When the flow g changes, the smaller the output pressure change, the better. The lower the general output pressure, the smaller it will fluctuate with the change in output flow.

It reduces the higher liquid pressure in the front line of the valve to the desired level behind the valve. The transmission medium here is mainly water. Pressure reducing valves are widely used in high-rise buildings, urban water supply network areas with high water pressure, mines and other occasions to ensure proper water pressure and flow for each water point in the water supply system. Since the water leakage rate and waste are almost proportional to the water pressure of the water supply system, the pressure reducing valve has the effect of improving system operation conditions and potential water saving. According to statistics, the water saving effect is about 30%.

There are many types of pressure relief valves. In the past, diaphragm valves, internal spring pistons, etc. were commonly used. The basic principle of the relief valve is to reduce the water pressure by the local resistance of the flow channel to the flow.

JB/T2203-1999 "The general category of pressure relief valve structure-based. At present, most of the domestic manufacturers of pressure reducing valves are designed and manufactured in accordance with this standard, but this standard is not perfect and the specifications are not complete. The maximum nominal diameter of the gas pressure reducing valve is DN500, and the maximum nominal diameter of the water pressure reducing valve is DN1000. According to the specifications of the pressure reducing valve produced by the manufacturer and the available data, the connection dimensions of each manufacturer are not uniform. It is recommended that the General Machinery Research Institute revise the length of the JB/T2203-1999 “reducing valve structure”. The proposed design institute and user are selected according to the standard, and the pressure reducing valve manufacturer is designed and manufactured according to the standard.

This article is made up of Shanghai Five-Valve Pressure Reducing Valves: Gain knowledge, exchange experiences, learn from each other! This article is for reference only. To learn more about the pressure relief valve, you can call Shanghai Wuyue Pump & Valve Manufacturing Co., Ltd.

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