Butterfly valve with tamper switch.

·         Grooved Butterfly Valve with Tamper Switch - Commonly used in fire protection .Dual electronic supervisory tamper switch for connection to fire control panel and auxiliary device (e.g., bell or horn)

·         A tamper switch is a mechanical and electrical device connected to a fire protection valve that signals a warning if the valve partially or fully closes. Regardless of the type of tamper switch, they all function similarly. The tamper switch features an actuating unit, usually a lever or cable with a resting position

·         When the valve closes, the actuating unit breaks an electrical circuit which triggers a signal. Think of it like a light bulb: when the light switch is on, a circuit is formed and the bulb shines brightly. When the switch is turned off - or, in the case of a fire protection tamper switch, the valve closes - the circuit is broken. For tamper switches, this broken circuit creates a signal. In most jurisdictions this does not mean the fire alarm goes off, though check with your Authority Having Jurisdiction to make sure of your local rules, but rather the tamper switch sends the signal to a fire control panel which creates a record of the incident.