Pneumatic diaphragm shut-off valve, gas is an execution unit of modular instrumentation. It has a simple structure, the operating force, small body, light weight, low flow resistance, valve capacity, good sealing performance, easy maintenance. Widely used in petroleum, chemical, metallurgy, electric power, textile and other production process automation and control systems. Main Performance Parameters Nominal diameter DN (mm) 15 20 25 32 40 50 65 80 100 125 150 200 Rated flow coefficient kv sleeve 11 20 30 4,875,120,190,300,480,760 single base 5 7 1,120,304,875,120,190 300,480,760 rated tee stroke (mm) 8 12 20 25 40 50 allowable leakage hard seals (L / H) of the sleeve 5 × 10-5 valve rated capacity of a single-seat, three rated 1.2 × 10-7 × valve Capacity soft seal (ml / min) no medium temperature ℃ -200 ~ + 200, -40 ~ + 450 diaphragm effective area (cm2) (film type shut-off valve) 1,002,004,006,001,000 nominal pressure PN (MPa) 1.6 4.0 6.4 allowing the pressure (MPa) 6.4 6.4 3.8 2.5 single-seater 2.9 1.8 2.0 1.3 0.83 0.8 0.55 6.4 0.52 sleeve signal pressure KPa 200 (film sheet) Body Ht200 ZG230-450 \ ZG1Cr18Ni9Ti sleeve 1Cr18Ni9Ti Cr18Ni12Mo2Ti spool valve, valve seat 1Cr18Ni9Ti Cr18Ni12Mo2Ti PTFE flexible graphite filler can be equipped with accessory air filter pressure reducer, solenoid valves, valve echo, etc.