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When selecting valves and designing pipelines, the following points should be noted:

1. Select valves that meet various requirements based on the location and purpose of the valve and after understanding the relevant laws, regulations, specifications, standards, guidelines, and permitted approvals;

2. Determine the working conditions, applicable media, working pressure, and medium temperature of the valve

3. Determine the nominal diameter DN that matches the pipeline (mm)

4. Determine the connection method with the pipeline: flange type, internal (external) thread type, welding type, clamp type, clamp type, slot type, sleeve type, etc.

5. Determine the operation method of the valve: manual, worm gear, pneumatic, electric, hydraulic, electromagnetic, electro-hydraulic

6. Determine the type of valve: Gate Valve, stop valve, throttle valve, ball valve, butterfly valve, diaphragm valve, plug valve, check valve, safety valve, pressure reducing valve, steam trap, plunger valve, hydraulic control valve and other special valves

7. Determine the use of the valve: switch type, regulating type, safety type, etc.

8. Determine the material of the valve body and internal parts: gray iron, ductile iron, carbon steel, alloy steel, stainless steel, monel alloy, copper alloy, aluminum alloy, plastic, etc.

9. Determine the sealing performance requirements, sealing grade or sealing leakage of the valve

10. Determine the protective coating requirements, packaging requirements, and transportation requirements of the valve
11. For valves with special needs, parameters such as structural length, valve height, overall dimensions, flow resistance, discharge capacity, flow characteristics, protection level, explosion-proof performance, etc. should also be determined.
12. Determine the installation position and posture of the valve