They are defined as traceable Butterfly Valve – Wafer, regional control valve. They are used as shut-off valves on water supply lines in order to separate (control) the zones inside the premises from each other. Butterfly valve or rising shaft valve is used for cutting or control purposes. The position of all valves used in fire systems should be visible and electrically traceable. Butterfly valves are of the flywheel type with gearbox. The tracking switch of butterfly valves is located in the valve and there is an on-off position indicator on it.