SLM series is a new independent kind of multi-turn electric actuator. It applies to automatically control the gate valve, globe valve and so on which valve travel is beeline. It is widely used in such industries using pipeline as Petroleum, chemical industry, metallurgical industry, construction, municipal works, papermaking, fire power station and water power station etc. The basic model of series SLM products is outdoors model, with protection class IP65 ( if IP67 or IP68 is required, please put forward it). The design and the technical performances of SLM products accord with JB/T8528-1997 General terms of technical parameter of electric actuator for valve. Add electric controlling passive contacts, the capacitor for motor, the position feedback board, VOT , this improved the technical lever of the economic products , so that our customer can use products with excellent performance, fully function and reasonable price.