In the natural gas pipeline system, steel pipeline valve is a control element, its main function is to regulate the flow, isolation equipment and piping systems to prevent backflow, excretion pressure. In the piping system, select the appropriate natural gas pipeline valves is very important.

Steps of selection valves
(l) clear purpose valves, valve determine working conditions: for the media, work pressure, temperature, etc.
(2) determine the connection pipe and valve nominal diameter and connections, such as flanges, threads and so on.
(3) according to the material medium piped, work pressure, temperature determines the selected valve housing and trim, select the type of valve.
(4) determine the selection of valve geometry parameters: length of the structure, form and size of the flange connection, open and close the valve shoulder height direction size, bolt hole size and the number of connections, the entire valve dimensions and so on.
(5) the use of existing data, such as product catalog valves, valves and other product samples to select the appropriate valves.