It Can replace the Servo Motor GT31 series. Reversible gear motors transmit rotary movements between 0°and 90°,for actuation of gas and air valves, with voltage-free limit switches, automatic/manual operation(optical), position feedback and externally readable position indicator, running time: 3.7-60s. Main modles as follow: NameElectric Actuator for valvesElectric Actuator for valvesModelGT31- ...