... )butterfly valve,C. Welded butterfly valveD. Flange butterfly valveE. Threaded-welded butterfly valveF. Flange-welded butterfly valveG. Pneumatic butterfly valve, aluminium pneumastic actuator butterfly valveH. Electric actuator butterfly ... valve2) Ball valve: A. Quick-installed ball valve,B. Without resort-liquid ball valve, C. Threaded three-way ball valve,D ...