... 500mm Best price and quality. Pneumatic Diaphragm Steam Control Valve(150Lb, 300Lb, 600lb,900Lb,etc) Features:Top-guided ... flow coefficient increases 30%. Wide adjustable scope, inherent adjustable ratio is 50:1. The valve actuator use multiple springs structure, ... ,304 Diaphragm With nylon fabric nitrile rubber Springs 60Si2Mn Valve Stem 0Cr18Ni9, 2Cr13,304,316Ordering information When ordering, ...