This series solenoid valve adopts integral slot slide valve structure and the valve hole is machined by special high precision finishing process, with the charac- teristics of handsome appearance, quick change, reliable performance and auto-matic compensation for wear of seal element The valve can be subdivided into two-position & three-port and two-position & five-port in function. The control mode is subdivided into single and double electric control, single and double pneumatic control.