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

1.Series of fluoroplastic lined check valve:

1).The types of swing check valve are H*4F*6 and single petal revolve and H*6F*6 dual petal revolve,the petals are all rotate around the axes out of the base to avoid the medium swing back flow.The characteristic of H*4F*6 and H*4F*6 check vlave 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,in addition,the characteristic of H*2F*6 and H*6F*6 check valve:the body,petal and the reposition spring lined the erosion-resistant fluoroplastic liner,the reasonable spring to produce the enough pressure and ensured the reliability of sealing.

2).Lift standing check vlave:the main types are:H*0F*6,H*2F*6 and H*2F*6 lift standing check valve,amoung that the H*0F*6 is a new type,thepetal is ball form,the same characteristic is :liner petal make the lift movement along the accesso valve.

3).Characteristic of the H*1F*6 frank way lift check valve:the fluoroplastic lined petal is vertical to the entranc axes make lift movement.

2.Criterion of design:

It adopt the standard of GB****2,G****5,GB****6 and API6D.