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    Pneumatic three eccentric hard seal butterfly valve


    Product model: D643H / W / Y

    Nominal diameter: DN50 ~ 2000mm

    Pressure range: PN0.6 ~ 2.5MPa

    Applicable temperature: carbon steel: - 29 ℃ ~ 600 ℃, stainless steel: - 40 ℃ ~ 600 ℃

    Applicable media: heat transfer oil, steam and gas

    Design standard: GB / T12238-1989

    Flange standard: GB / T9113 ~ 2000

    Length standard: GB / T12221 ~ 1989

    Test standard: GB / T13927-1992


    PRODUCT OVERVIEW

    Pneumatic three eccentric hard seal butterfly valve is composed of hard seal butterfly valve, pneumatic actuator and triple parts. The valve body of hard seal butterfly valve is an integral casting, and the butterfly plate adopts multi-level hard seal to ensure the tightness of the valve. The sealing surface of the flow channel adopts Stellite surfacing, which has the characteristics of temperature resistance, corrosion resistance and so on. It is especially suitable for pipes of heat transfer oil, gas, steam, slightly corrosive gas and liquid, and various temperature media. With compressed air as the power, by receiving the industrial signal (4 ~ 20mA) output from the industrial instrument, push the valve rod to drive the rotating disc plate to rotate (0-90 °) at any angle to complete the switching and regulation of medium flow.


    PRODUCT FEATURES

    1. The butterfly plate adopts three eccentric multi-level sealing structure, and the sealing surface adopts Stellite surfacing. The valve seat and butterfly plate are almost free of wear when opening and closing. It has the sealing function of closing and tightening.

    2. With two-way sealing function, it is not limited by the flow direction of media during installation. It has good wear resistance and erosion resistance for some special medium pipelines.

    3. The sealing ring is made of stainless steel, which has the dual advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance and long service life under low and high temperature.

    4. The sealing surface of butterfly plate adopts surfacing cobalt based cemented carbide, which is wear resistant and has long service life

    5. The large-size butterfly plate adopts quilted frame structure, with high strength, large overflow area and small flow resistance.

    6. The pneumatic device can be installed in multiple stations (rotating 90 ° or 180 °), which is convenient for users.


    MAIN PERFORMANCE SPECIFICATIONS

    Nominal diameterDN(mm)DN50~1200
    Nominal pressurePN(MPa)0.61.01.62.5
    Test pressurestrength test0.91.52.43.75
    Sealing test0.661.11.762.75
    Low pressure air tightness test0.5~0.7
    Applicable mediaAir, water, sewage, steam, gas, oil, etc
    Applicable temperatureCarbon steel: - 29 ℃ ~ 600 ℃, stainless steel: - 40 ℃ ~ 600 ℃


    MATERIAL OF MAIN PARTS

    Part nameMaterial Science
    Valve bodyCast iron, stainless steel, chromium molybdenum steel, alloy steel
    DiscCast steel, alloy steel, stainless steel, chromium molybdenum steel
    Seal ringStainless steel and high temperature resistant asbestos board are combined into multiple layers
    Valve stem2Cr13、1Cr13Stainless steel, chromium molybdenum steel
    FillerO-ring, flexible graphite


    MAIN OVERALL DIMENSIONS

    Nominal diameter(DN) Main dimensions Flange size and bolt specification
    1.0MPa 1.6MPa 2.5MPa
    L H1 H D D1 n-Фd D D1 n-Фd D D1 n-Фd
    50 108 350 112 165 125 4-18 165 125 4-18 165 125 4-18
    65 112 370 115 185 145 4-18 185 145 4-18 185 145 8-18
    80 114 380 120 200 160 4-18 200 160 8-18 200 160 8-18
    100 127 420 138 220 180 8-18 220 180 8-18 235 190 8-22
    125 140 460 164 250 210 8-18 250 210 8-18 270 220 8-26
    150 140 555 175 285 240 8-22 285 240 8-22 300 250 8-26
    200 152 760 200 340 295 8-22 340 295 12-22 360 310 12-26
    250 165 830 243 395 350 12-22 405 355 12-26 425 370 12-30
    300 178 895 250 445 400 12-22 460 410 12-26 485 430 16-30
    350 190 950 280 505 460 16-22 520 470 12-26 555 490 16-33
    400 216 1190 305 565 515 16-26 580 525 16-26 620 550 16-36
    450 222 1255 350 615 565 20-26 640 585 16-30 670 600 20-36
    500 229 1305 380 670 620 20-26 715 650 20-30 730 660 20-36
    600 267 1340 445 780 725 20-30 840 770 20-33 845 770 20-39
    700 292 1520 480 895 840 24-30 910 840 24-36 960 875 24-42
    800 318 1710 530 1015 950 24-33 1025 950 24-39 1085 990 24-48
    900 330 1810 580 1115 1050 28-33 1125 1050 28-39 1185 1090 28-48
    1000 410 1960 650 1230 1160 28-36 1255 1170 28-42 1320 1210 28-56
    1200 470 2250 760 1455 1380 32-39 1485 1390 32-48 1530 1420 32-56


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