Cut off: cut off the medium in the pipeline. Such as: gate valve, globe valve, ball valve, plug valve, butterfly valve, etc.
Non-return use: to prevent the backflow of the medium. Such as: check valve
For regulation: to regulate pressure and flow. Such as: regulating valve, pressure reducing valve, throttle valve, butterfly valve, V-shaped opening ball valve, balance valve, etc.

The distribution is used to change the flow direction of the medium in the pipeline and distribute the medium. Such as distribution valve, three-way or four-way ball valve, plug valve, etc.
Safety use: used for overpressure safety protection. Such as: safety valve, overflow valve
Other special applications such as steam traps, air traps, blowdown valves, vent valves, breathing valves, slag discharge valves, temperature control valves, etc.