SS 316L manual butterfly valves (ISO9001:2000,CE,TUV certified) DN10-DN200,1/ ... /male,weld/clamp,weld/male,clamp/male(9)Operation: 1) Manual, 2/3/4-position pulling handle, multi-position plastic/stainless ... adjustable. 2) Pneumatic: Stainless steel pneumatic actuator, Aluminum pneumatic actuator. Single-action(air open/spring close)or double-action(air open ...