By end-use, the valve can be divided gas valves according to the different uses:

1 breaking with: to connect or disconnect the gas pipeline, such as the cut-off valve, gate valve, ball valve, butterfly valve. 2 ended reuse: to prevent the backflow of gases, such as check valves. 3 adjustment: adjust the gas pressure and flow, such as valves, valve. 4 assignment: to change the flow of the gas, gas distribution, such as the three-way cock, dispensing valve, spool valve. Fourth, according to the driving hydraulic cutting machine mode, depending on the driving mode can be divided into: 1 Manual: With hand wheels, handles, levers or sprockets, etc., there are human-driven, large transmission torque when fitted with worm reduction gear and gear motor 2: With motor or other electrical device driver. 3 air; driven by compressed air. Five, according to the pipe connection points, according to the valve and Interlock SAE Flange pipe connections can be divided; 1 Flanged valves: valve with flanges, valves and pipe with flanged connections. 2 threaded connection valve: Body with internal or external threads, threaded pipe connection using valves. 3 welded connection valve: body with welded joints, valves and pipe with welded connections. 4 clamp connection valve: the valve body with jaws, valves and pipe with clamp connections. 5 card sets connected to the valve: A valve sleeve and pipe connections