'Potter OS & Y Supervisory Switches

Potter OSYSU Series is a specialized supervisory switch designed to monitor the open position of an Outside Screw and Yoke (OS&Y) gate valve. This critical life-safety device ensures that the main water supply valves for fire sprinkler systems remain open, providing an immediate alert to a fire alarm panel if the valve is partially or fully closed. Its universal design allows it to mount easily to the valve yoke, where its trip rod tracks the movement of the threaded stem.