The valve is introduced

source：https://baike.baidu.com/item/閥門     adding：2019/9/16 15:09:00

Valve is used to open and close the pipeline, control the flow direction, adjust and control the parameters of the medium (temperature, pressure and flow) pipeline accessories. According to its function, it can be divided into shutoff valve, check valve, regulating valve and so on.

The valve is the control part in the fluid transportation system, which has the functions of cut-off, regulation, diversion, prevention of backflow, voltage stabilization, shunt or overflow, etc. Valves used in fluid control systems range from the simplest globe valves to the most complex automation systems.