JFlow Controls offers a complete line of valve position indicators (limit switches) for automated valves. A limit switch is a device that is used to prove the open or closed position of a valve. 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. J Flow’s limit switches have a visual beacon that is on top of the device to allow operators to visually and easily see if the valve is open or closed. NEMA 4, 4X or 7 are available.