Check valve selection standard content

Check valve selection standard content

1. The diaphragm check valve is suitable for the pipeline which is easy to produce water hammer. The diaphragm can well eliminate the water hammer when the medium is countercurrent. It is generally used in the low pressure and normal temperature pipeline, especially for the water pipeline. The working temperature of the medium is between - 12 ℃ and 120 ℃, and the working pressure is less than 1.6Mpa, but the diaphragm check valve can achieve a larger diameter, The maximum DN can be more than 2000mm;

2. Ball check valve is suitable for medium and low pressure pipeline, and can be made into large diameter;

3. The shell material of the ball check valve can be made of stainless steel, and the hollow sphere of the seal can be wrapped with polytetrafluoroethylene engineering plastic, so it can also be used in the pipeline of general corrosive media. The working temperature is between - 101 ℃ and 150 ℃, the nominal pressure is less than or equal to 4.0Mpa, and the nominal diameter range is between DN200 and DN 1200;

4. When selecting the check valve for incompressible fluid, the first step is to evaluate the required closing speed. The second step is to select the type of check valve that may meet the required closing speed;

5.valve for incompressible fluid. If the range of medium flow is large, check valve for compressible fluid can use a deceleration device. If medium flow stops and starts continuously and quickly, such as the outlet of compressor, lift check valve is used.