... Leakage. 3.Easy to implement remote control. Two Way Pneumatic Water Flow Control Valve Main Technical Parameters DN(mm) ... steel(ZG230-450),Cast stainless steelZG1Cr18Ni9Ti,304,304L,316,316L,corrosion-resisting alloy…lSphere/seat material:PTFE,A105 ... ,1Cr13, 304,304L,316,316L,corrosion-resisting alloy…lTight seal surface materials:hard ...