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NOTE: This is an unformatted excerpt from our online fire protection training library.

Supervisory Initiating Devices

Valve Supervision

Sprinkler Control Valves

Valve supervisory switches are often referred to as "tamper switches." The supervisory switch shown in this photo has a wireless transmitter. Actuation of the supervisory switch transmits a radio signal to the fire alarm control panel. This type of switch can be useful when adding valve supervision to existing valves where it is too difficult, impractical or uneconomical to run wiring from the valve supervisory switch back to the fire alarm control panel. This photo clearly shows the groove machined into the stem of the valve. The finger extending from the valve supervisory switch is also visible. When the valve is fully open the finger rests in the groove and the switch remains open. When the valve closes the stem moves inward forcing the finger out of the groove. This closes the switch and results in transmission of a supervisory signal. This sprinkler control valve is equipped with a valve supervisory switch. The switch is a small metal finger that normally rests in a groove in the valve. When the valve handle is turned the valve stem moves inward forcing the finger out of the groove. This closes a set of electrical contacts and initiates a supervisory signal to the fire alarm control unit.

The photo on the right shows the groove machined into the valve stem. The finger of the valve supervisory switch is also visible.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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