A limit switch is a device that is used to prove the open or closed position of a valve.
These switches can either be a mechanical device or a proximity switch. Many times when it is a proximity switch, they are referred to as a “prox switch”. Limit switches can send a confirmation signal to a PLC (Programmable Logic Controller) or a DCS (Distributed Control System) to let the computers know if the valve is open or closed. Very often limit switches have a visual beacon that is on top of the device to allow operators to visually and easily see of the valve is open or closed. These switches need to be classified for the area classification that they are operating in such as NEMA 4, 4X, or 7.
Check out any of our automated valves to spec your valve with a limit switch today! Make sure you check out our video!- “What is a limit switch?”