This is the symbol of check valve for hydraulic system.Check valve is used in hydraulic system for one direction flow.
It will restrict the oil return flow.
Function of check valve
In this valve one ball is used,which will allow only one direction flow.
Some times spring will be used to set pressure.When oil pressure exceed set pressure the ball will move against spring and open the path.
When the pressure reduce the path is blocked by ball with spring tension.
CNC programming.
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