Midline Flange Butterfly Valve
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Midline Flange Butterfly Valve

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Midline flange butterfly valve


1. Design Basis
▪ Design and manufacture according to: GB/T12238-1989
▪ Flange standard: GB/T9115.1-2000
▪ Fae to face: GB/T12221-1989    GB/T17241.6-1998
▪ Pressure Test: GB/T13927-9


2. Technical Parameter

DN(mm)              50~1200
PN(Mpa) 1.0  1.6
Testing Pressre strength 1.5 2.4
seal(water) 1.1 1.76
seal(air) 0.6
Leakage Rate A level(zero leakage)
Applicable Medium water,sewage,stem,air,oil,acid,alkali,salt etc.
Suitable Temperature 29~150
Actuator worm gear,pneumatic,electric


3. Main Part Material

Name Material
body gray iron,ductile cast iron,cast steel
plate ductile cast iron,CF8,CF8M,nylon 11,1.4529,2507
sealing ring NBR,EPR,VITON,PTFE,neoprene
stem 2Cr13,1Cr13,stainless steel,CF8,CF8M,17-4PH


          Midline Sealing Flange Butterfly Valve (D341X)
4. Main Size Dimensions

Diameter A H D0 C d b D K N-d0 N-T D1 D2 N-d1 F Φ W J
mm inch
DN80 3 159 32 78.8 127 120 19.1 191 152.4 4-19
90 70 4-10 20 12.7 3 13.9
DN100 4 178 32 104 127 144 23.9 229 190.5 4-19
90 70 4-10 20 15.9 5 17.9
DN150 6 203 40 155.7 127 197 25.4 279 241.3 8-22.4
90 70 4-10 20 25.4 8 28.4
DN200 8 242 51 202.41 152 252 28.5 343 298.4 8-22.4
125 102 4-12 22 28.6 8 31.6
DN250 10 274 76 250.42 203 305 30.3 406 361.9 12-25.4
125 102 4-12 22 34.9 10 37.9
DN300 12 313 76 301.5 203 350 31.8 483 431.8 12-25.4
125 102 4-12 24 38.1 10 41.1
DN350 14 356 76 333.32 203 415 35.1 533 476.2 12-28.4
125 102 4-12 24 44.5 12 47.5
DN400 16 382 76 389.61 203 460 36.6 597 539.8 12-28.4 4-1 175 140 4-18 24 50.8 14 54.3
DN450 18 420 89 440.51 203 510 39.7 635 577.8 12-31.8 4-11/8 175 140 418 26 54 16 58
DN500 20 459 89 491.64 203 560 43 699 635 16-31.8 4-11/8 210 165 4-22 26 60.3 18 64.3
DN600 24 572 89 592.5 203 660 47.8 813 749.3 16-35.0 4-11/4 210 165 4-20 26 69.9 20 74.4


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