seal face of seat , the backflow of medium make disc back to seat and the fluid can be cut down .so it like globe valve except moving type of disc .

According to the using requirement , disc can be made from metal , metal embed in rubber insert or rubber ring .
Just like globe valve

,lift check valve have narrow channel ,so pressure of fluid in lift check valve is bigger than swing check valve . swing check valve have

fewer restrictions in flow rate.
Check valve with different materials can be used in pipe with various medium. Check valve become one

of fluid parts of the complete pipeline when check valve is installed. The state of valve will be influenced by transient flow state of

system it work .while, state of valve can affect transient flow state of system.
Check valve is also called reflux valve , inverted

valve , counterbalance valve , non return valve, this kind of valve open and close by power caused by fluid in pipeline .usually these

valve work automatically. Welding lift angle check valves in pipe system is used to prevent backflow of medium and rollback of pump and

bleed of medium in vessel. It also used in pipe which provide supplies to supporting system.

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