... ,since 1993 , professional in producing butterfly valve. nu NameWafer type butterfly valve Design standardEN593 ,API609 , BS5155 , MSS SP- ... .Mainly products our factory can produce as follows : 1. Wafer type butterfly valve ( style : lever , gear box , pneumatic apparatus ... valve - lever , gear box , actuator, pneumatic apparatus. 6. Y-Strainer . 7.Middle line flange butterfly valve (D341) 8.Corrosion ...