The valve limit switch, also known as the travel switch, can also be called a return device. It is a field instrument hat detects the status of the valve in the automatic control system. t is used to output the open or closed position of the valve as a switch (contact) signal. t is accepted by the programmer or sampled by the computer. After confirmation,the next program is executed. The product can also be used as an important valve interlock protection and remote alarm indication in the system. If you want to grasp the valve position status of the two-position valve, the valve limit switch is an effective configuration, which is an electrical switch used to indicate and feedback the movement limit position of mechanical equipment.