Steps To Choose Valves

1. To know the application of valves in devices and equipment, as well as working conditions, practical medium, working pressure, and working temperature.

2. To confirm the nominal diameter and connecting method: flanged, threaded, welded, etc.

3. Make out the valves' operating method: manual, electric, electromagnetic, pneumatic or hydraulic, electrohydraulic, and so on.

4. According to the medium transported by pipelines, working pressure, and working temperature, to confirm the shell and internals of selected valves: cast iron, carbon steel, stainless steel, alloy steel, stainless acid-resistant steel, gray cast iron, malleable cast iron, ductile cast iron, copper alloy, etc.

5. Choose the valve types: closed-circuit valve, pressure reducing regulator valve, safety valve, etc.

6. Check the valve pattern: gate valve, globe valve, ball valve, butterfly valve, throttle valve, safety valve, pressure reducing valve, steam trap, etc.

7. Check the valve parameters: as for active valves, it is necessary to determine the allowable flow resistance, discharge capacity, back pressure, etc., and then determine the nominal diameter of the pipeline and the diameter of the valve seat hole.

8. Check the geometrical parameter: structure length, flange connection and its size, valve height and size after opening and closing, size and number of bolt holes for connection, and overall dimensions of all valves, etc. 

9. Using the existing materials, such as valve product catalogue, valve product samples to select the appropriate valve products.

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