Inflatable Seat Butterfly Valve  ★★★★★
  • A31INF
    		•
    GENERAL INFORMATION TECHNICAL DATA PARTS LIST DIMENSIONS(mm)

    Series A31lNF inflatable seated butterfly valves use air pressure to expand the seat against the disc. providing even pressure distribution for a bubble-tight seal in every close. Because the seat has no contact with the disc during valve opening and closing, there is minimum disc to seat friction.
    In actual comparison tests and documented field applications, an A31lNF butterfly valve lives more than one million cycles. For dry solids, gases, slurry and high abrasion applications, the A31inflatable seated butterfly valve is unsurpassed.

    Connection Wafer
    Nominal diameter DN25-DN600
    Max. working pressure Up to 10Bar
    Standard working pressure Full vacuum to 8bar (According to air supply)
    Flange
    accommodation    		 EN1092 PN10/16,ASME B16.5 Class150
    Face to face EN558 Series 20, API 609 Table 1
    Top flange ISO 5211
    Tightness check ISO 5208 Category 3, API 598 Table 5
    Temperature range -40°C to +200°C (Depending on pressure, medium and material)
    Operation Pneumatic actuator (DA, SA)
    Torque Varies with medium and application


    No. Part name Material Standard Surface Treatment
    1   Body Ductile Iron ASTM A536 Gr.65-45-12(GGG40) Epoxy RAL5021
    Stainless Steel ASTM A351 CF8 Passivation
    ASTM A351 CF8M Passivation
    2  Disc Ductile iron Nickel plated ASTM A536 65-45-12 Nickel plating
    Ductile iron Nylon coated ASTM A536 65-45-12 Rilsan
    Stainless Steel ASTM A351 CF8 Passivation
    ASTM A351 CF8M Passivation
    SS Tungsten coated ASTM A351 CF8+WC Tungsten coating
    SS PTFE Wrapped ASTM A351 CF8+PTFE PTFE lined
    3 Seat Nitrile Rubber NBR(BUNA-N)  
    Wear-resistant Nitrile XNBR  
    Copolymer EPDM-HT EPDM-HT  
    Polyurethane PU  
    Fluoelastomer FPM(VITON)  
    4 Stem Stainless Steel SS431  
    5 Retainer Stainless Steel SS304  
    6 Weather seal Nitrile Rubber NBR(BUNA-N)  
    7 Bearing Nylon Bonded Nylon Rilsan
    RPTFE (for SS body) RPTFE with Graphite I.D.  
    8 Screw Nylon Bonded SS304  


    SIZE A B C D Di Do E F d G H L WT
    (kg)
    DN INCH
    25/32 1"/1 1/4" 110 51 13.5 75 34 61 9 50 8 70 19 30 1.5
    40 1 1/2" 130 54 13.5 85 42 71 9 50 8 70 28 33 2
    50 2" 135 72 19 94 52 86 11 70 10 90 32 43 3
    65 2 1/2" 150 83 19 115 67 104 11 70 10 90 50 46 4
    80 3" 161 92 19 135 81 122 11 70 10 90 69 46 5
    100 4" 177 105 19 151 101 140 11 70 10 90 88 52 6
    125 5" 195 120 19 185 127 141 14 70 10 90 115 56 8
    150 6" 208 133 19 204 151 195 14 70 10 90 141 56 9
    200 8" 239 170 25 265 202 248 17 70 10 90 194 60 13
    250 10" 281 200 32 320 254 301 22 102/125 12/14 150 240 68 23
    300 12" 316 236 32 375 300 354 22 102/125 12/14 150 290 78 31
    350 14" 332 254 40 425 339 401 22 125 14 150 330 80 43
    400 16" 367 301 40 475 388 451 27 125 14 150 377 102 58
    450 18" 397 341 65 535 440 515 36 140 18 175 425 114 95
    500 20" 437 382 65 590 490 573 36 140 18 175 475 127 125
    600 24" 522 464 80 695 590 660 46 165 22 210 570 154 180

    ★ Do/Di flange sealing face dimension is a big advantage of Magic Series butterfly valve which suitable for both slip-on and plate flange. Serrated sealing face eliminates roll out of seat.