A valve is a facility in a medium flow or pressure system that is used to regulate the flow or pressure of a medium. Its functions include cutting off or switching on the medium, controlling the flow rate, changing the flow rate, changing the direction of the medium flow, preventing the backflow of the medium, controlling the pressure or venting the pressure. Classification by application:
1. Interrupting: used to cut or connect the pipeline medium. Such as shut-off valves, gate valves, ball valves, plug valves, etc.
2. Distribution: It is used to change the flow direction of the medium and play a distribution role. Such as three-way, three-way globe valve, etc.
3. Check return: used to prevent the medium from backflowing. Such as check valves.
4. Safety: When the medium pressure exceeds the specified value, the excess medium is discharged to ensure the safety of the equipment. Such as safety valves, accident valves.
5. For gas obstruction and drainage: retain gas and remove condensate. Such as steam traps.
