Diaphragm valve is a special form of the block valves and have the following features compared with other valves
Elastic sealing to ensure there is no inner leakage
Streamline runner to ensure low pressure drop
No packing material, so no outer leakage
Valve and cover is separated, to keep the bonnet and stem parts from media erosion
With diaphragm replaceable and low maintenance cost
Lining materials could be used in various media and have good corrosion resistance