... . 5.Factory since 1993 Name :2''~20'' Wafer type butterfly valves / centerline butterfly valve / Valves / Butterfly valves. Brand : TST . we also do Brand ... . Wafer type butterfly valve ( style : lever , gear box , pneumatic apparatus , electronic apparatus ), Fire-proof butterfly valve . 2. Double disc Check valve , Grooved end butterfly valve , Lug type butterfly valve , Industry butterfly valve , ...