The diaphragm valve is a special globe valve with shut-off function.Its open-close accessory is made of：steel petal and soft material， valve inner cavity and cavity of cover ater seperated to cut-off the medium in the pipe.

One、series of the dai phrag m valve：
Basic series are G41F46 weir valve and G45F46 diaphragm valve，the characteristics are as follows：
1.Complex septum separate the lumen under part and cavity of cover，it wil separate the pole of valve，petal of valve and medium，the packing stuff are omitted，the inner leakage and outer leakage are avoided simultaneously.
2.The diaphragm， made by the fluoro plastic lined FEP and synthetic rubber and the valve with fluoro plastic liner are applied to all kinds of serious erosive medium except'fus alkali metal and F element".
3.The diaphragm regard as executing element is easy cracked because of frequent start and close，so that it must be exchanged regularly.
4.The erosion-proof performance of fluoro plastic lined and usage temperature recom-mended is placed in"the fluoroplastic lined used by the valve and pipe accessory.

Two、criterion of design：
According to standard GB12239，BS5156.

Three、way of drive：
Manual，pneumatic，power-drive.