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The National Fire Alarm Code (NFPA 72) requires that a valve supervisory switch provide a distinct indication whether the valve is open or closed. The "lacing" type valve switch on the valve in this photo does not meet that requirement. The device is comprised of a base unit and a loop of wire with a plug at one end. When the valve handle is turned, the plug is pulled from the base. Removal of the plug initiates a either a trouble or supervisory signal, depending on the equipment that is used to make up the switch.
Unfortunately, the switch can be reset without the valve being in its normal, fully open position.
© Hughes Associates,Inc. 2012