Valves are pipeline accessories used to open and close pipelines, control flow, regulate and control the parameters of the transport medium (temperature, pressure and flow). According to its function, it can be divided into shut-off valves, check valves, regulating valves and so on.
Valves are the control components of the fluid transportation system, with a cut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow relief and other functions.
Valves used in fluid control systems, from the simplest stop valve to the extremely complex self-control system used in a variety of valves, its varieties and specifications are quite numerous.