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　　The SMC series which is introduced Limitorque technology from USA is a kind of muti-turn valve electric actuator. It has been widely used to petroleum, chemical engineering ,metallurgy, electric power ,military ,municipal ,light industry ,food and other fields. Customers can control one machine or multiple machines intensively. It is possible to control a machine locally or remotely. This series has a lot of type specifications such as general type, explosion-proof type, integrated type, integrated explosion-proof type, high temperature and high speed type, radiation-proof type, auto-regulation type, bus control type and so on. Company also can produce submerged type. Cold-resistant type and ship and submarine type are dedicated type on customers' requests.