Materials of main components
Valve body, valve cover: ZG230-450;ZG1Cr18Ni9Ti
Internal components of valve: 1Cr18Ni9Ti
Bellows: 1Cr18Ni9
Filler: PTFE
Diaphragm: NBR folder enhanced polyester fabric
Trust stem: 45#、2Cr13
Bracket: HT200
Membrane cover: carbon steel
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