Indicating Butterfly Valve – Grooved
StandardsUL - FM
They are defined as local control valves. Generally they are used in water feed lines as interruption valves in order to separate (to control) zones in the location. Butterfly valves or rising stem valves are used in order to shut off or to control the flow. The position of all valves in fire systems should be visible and electrically monitored. This butterfly valve type has a gearbox with handwheel. The supervisory switch is located inside the butterfly valve and includes also an on/off indicator.