This butterfly signal valve is an essential component of an Automatic Water Spray Extinguishing System. It is used to control water supply. It has a position valve that transports the electric signal to the main control.A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required.