The check valve is automatic valve that depends the flow of medium to open and close valve pet also as to prevent medium from opposite flowing.

One、series of fluoro plastic lined check valve：
1.The types of swing check valve are H44F 46 and single petal revolve and H76F46dualpetal revolve，the petals are all rotate around the axes out of the base to avoid the medium swing backflow.The characteristic of H44F46 and H74F46 check valve is：axes and petal of valve are designed as a whole，FEP axes is wedged in the special groove between body and cover of valve is in addition，the character is tic of H72F46 and H76F46 check valve：the body，petal and there position spring lined the erosion-resistant fluoro plastic liner，the reason able spring to produce the enough pressure and ensured there liab lty of sealing.
2.Lift standing check valve：the main types are：H40F 46，H42F46 and H72F46 lift standing check valve，among that the H40F46 is a new type，the peta is ball form，the same characteristic is：liner petal make the lIft movement along the access of valve.
3.Characteristic of the H41F46 frank way lift check valve：the fluoro plastic lined petal is vertical to the entrance axes make lft movement.

Two、criterion of design：
It adopt the standard of GB13932， GB12235， GB12236 and API 6D.