Divided into one-way valve and reversing valve according to the purpose.
1 check valve: only allows the fluid to be unidirectionally connected in the pipeline, and the reverse is cut off.
2 Reversing valve: change the on-off relationship between different pipelines, according to the working position of the valve core in the valve body, two, three, etc.; according to the number of channels controlled, two-way, three-way, four-way , five-way, etc.; such as two-position two-way, three-position three-way, three-position five-way, etc. according to the spool drive mode is divided into manual, motorized, electromagnetic, hydraulic and so on.