Butterfly Valves with Tamper Switch

Monitored wafer butterfly valves are defined as zone control valves. They are used as isolating valves on water supply lines to separate — that is, to control — the zones within a building. Either a butterfly valve or a rising stem gate valve is used for isolation or control. The position of every valve used in a fire system must be visible and electrically monitored. These butterfly valves are of the geared handwheel type; the tamper switch is inside the valve and an open/closed position indicator is fitted on it.