1. The diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem and disc located above the diaphragm are not corroded by the medium, thus eliminating the packing sealing structure and no leakage of the medium.

2. the diaphragm made of rubber or plastic soft seal has better sealing performance.

3. Generally, it is not suitable to be used in pipelines with temperature higher than 60 C and conveying organic solvents and strong oxidizing media, nor in pipelines with higher pressure.

4. corrosion resistance is good, operation safety and reliability.