W type JFS type EG6K41W, J, F-6, 10, 16 type pneumatic rubber lining/fluoroplastic lined diaphragm valve (normally open type) is a special form of shut-off valve. The biggest difference between the plastic diaphragm valve and other valves is: the structure without stuffing box; The rubber diaphragm can completely isolate the corrosive medium in the flow channel from all drive components, thereby eliminating the drawbacks of the usual valves such as "running, running, dripping, leaking".