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There are many types of selection criteria, the following small valves summarize 17 itemsCheck valve selection criteria:
1. In order to prevent the reverse flow of the medium in the project, check valves should be installed on the equipment pipelines;
2. Generally, vertical lift check valves should be used on horizontal pipes with a nominal diameter of 50mm;
3. In engineering, the check valve is generally suitable for clean medium, not suitable for medium containing solid particles and high viscosity;
4. Straight-through lift check valves can be installed on both horizontal and vertical pipelines;
5. The lifting type swing check valve has good sealing performance and large fluid resistance. The horizontal type should be installed on the horizontal pipeline, and the vertical type should be installed on the vertical pipeline;
6. For the pump inlet pipeline, it is more suitable to choose the bottom valve, which is generally only installed on the vertical pipeline of the pump inlet;
7. The installation position of the swing check valve is not limited. It can be installed on a horizontal, vertical or inclined pipeline. If it is installed on a vertical pipeline, the flow direction of the medium should be from bottom to top;
8. Ball check valves are suitable for medium and low pressure pipelines and can be made into large diameters;
9. The installation position of the butterfly check valve is not limited, it can be installed on a horizontal pipeline, or on a vertical or inclined pipeline;
10. The check valve should determine the size of the response. The valve supplier must provide the data of the selected size, so that the valve size can be found when the valve is fully open at a given flow rate;
11. When selecting a check valve for incompressible fluids, ① evaluate the required closing speed, and ② select the type of check valve that may meet the required closing speed;
12. For low-pressure check valves below DN50mm, butterfly check valves, vertical lift check valves and diaphragm check valves are suitable for use;
13. For high and medium pressure check valves below DN50mm, vertical lift check valves and straight-through lift check valves are suitable;
14. For low-pressure check valves with DN greater than 50mm and less than 2000mm, butterfly check valves and diaphragm check valves are suitable for use;
15. For pipelines that require less water hammer or no water hammer when closing, slow-closing swing check valves and slow-closing butterfly check valves are suitable.
16. For medium and low pressure check valves with DN greater than 200mm and less than 1200mm, it is suitable to choose non-wear ball check valves;
17. For high and medium pressure check valves with DN greater than 50mm and less than 600mm, swing check valves are suitable;
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