This series solenold valve adopts herion basic type    from germany in the structure of integralsection,with    the characteristics of handsome appearance,reliable    performance and automatic compensation for wear of    seal element,long service life. and high flow rate    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.