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Pneumatic flange eccentric soft sealing butterfly valve

Pneumatic flange eccentric soft sealing butterfly valve

Pneumatic flange type eccentric soft sealing butterfly valve is composed of angular stroke pneumatic piston type actuator and butterfly valve body. It is designed with three-dimensional eccentricity principle, so that the space movement trajectory of the sealing surface can be idealized, and the sealing surfaces have no friction, no interference with each other, Coupled with the proper selection of sealing materials, the sealing, corrosion resistance, high temperature resistance and wear resistance of the butterfly valve have been reliably guaranteed.

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Product Features of Pneumatic Flange Soft Sealed Eccentric Butterfly Valve

  1. Small operating torque, which is the smallest operating torque among all valves. It opens and closes quickly. It is powered by compressed air and mechanically drives the valve stem through piston racks and gears. , Rotating the valve plate 0~90° with the torque output by the angular stroke can quickly complete the opening and closing action, with simple structure, small size, light weight, small flow resistance, large flow coefficient and good sealing performance. The adjustment range is large. It is the execution unit of the instrument in the automatic control system.
  2. The electric-pneumatic valve positioner is used, which is powered by electric signal and compressed air, and accepts the 0-10mADC or 4-20mADC current signal input by the control system, and the compressed air is converted into the air source pressure signal input and output by the regulator. By changing the rotation angle of the valve plate (0-90° any angle), it can better adjust and control parameters such as flow.
  3. It adopts electromagnetic reversing valve and valve position feedback device , and uses AC220V or DC24V power supply voltage and compressed air as power to realize fast two-position cut-off control of fluid medium.
  4. The actuator adopts piston-type cylinder and crank arm conversion structure, with large output torque, small volume, and fully sealed waterproof design with high protection level. The cylinder block adopts mirror cylinder, no oil lubrication, small friction coefficient, corrosion resistance, super durability and reliability. All transmission bearings are lubricated by boundary self-lubricating bearings without oil to ensure that the transmission shaft is not worn.

Main end parameters

Nominal diameter DN (mm) 50～2000 50～1600
Nominal pressure PN (MPa) 0.6 1.0 1.6
Sealing test (MPa) 0.66 1.1 1.76
Strength test (MPa) 0.9 1.5 2.4
proper temperature Nitrile rubber: -40℃～90℃ Fluorine rubber: -20℃～200℃
Applicable media Water, air, natural gas, oil and weak corrosive fluids
leak rate Comply with GB/T13927-92 standard
drive mode Worm gear drive, electric, pneumatic, hydraulic

Main parts and materials

Part Name Material
valve body WCB, QT450-10, HT200, HT250
Butterfly WCB, QT450-10, HT200, HT250
valve shaft 2Cr13
sealing ring Nitrile oil resistant rubber
filler Flexible graphite

Pneumatic soft sealing butterfly valve Actuator parameters

Actuator model Single and double acting pneumatic actuator
Air supply pressure 0.4～0.7MPa
Air supply interface G1/4″, G1/8″, G3/8″, G1/2″
ambient temperature -30～+70℃
form of action Single-acting actuator: air-close (B)– valve position open (FO) when gas is lost; air -open (K)– valve position-close (FC) when gas is lost Double-acting actuator: air-close (B) )– Valve position hold (FL) when degassing; Air -to-open (K)– Valve position hold (FL) when degassing
Accessories available Positioner, solenoid valve, air filter pressure reducer, retaining valve, travel switch, valve position transmitter , hand wheel mechanism, etc.

New series of pneumatic actuators are adopted, including double-acting and single-acting (spring return), and rack and pinion transmission, which is safe and reliable; large-diameter valves adopt series G-type pneumatic actuators fork-type transmission, with reasonable structure and large output torque. There are double-acting and single-acting.

  1. Gear type double piston, large output torque and small volume.
  2. The cylinder is made of aluminum-gold material , which is light in weight and beautiful in appearance.
  3. Manual operating mechanisms can be installed at the top and bottom.
  4. The rack-type connection can adjust the opening angle and rated flow.
  5. The actuator can be equipped with electric signal feedback indication and various accessories to realize automatic operation.
  6. IS05211 standard connection provides convenience for product installation and replacement.
  7. Adjustable screws at both ends enable standard products to have an adjustable range of ±4° at 0° and 90°. Ensure synchronization accuracy with the valve.

Implementation standards

Manufacturing Standards GB/T122387-89
flange standard GB9113-2000, GB17241.6-1998
Structure length standard GB12221-89
Inspection standards GB/T13927-92

 

Main external connection dimensions Flange size and bolt hole size
DN L H A B 0.6MPa 1.0MPa 1.6MPa
D D1 D2 nd D D1 D2 nd D D1 D2 nd
50 108 82.5 306 80 80 140 110 88 4-14 185 125 99 4-18 165 125 99 4-18
65 112 92.5 321 80 80 160 130 108 4-14 185 145 118 4-18 185 145 118 4-18
80 114 100 346 80 80 190 150 124 4-18 200 160 132 8-18 200 160 132 8-18
100 127 110 387 95 95 210 170 144 4-18 220 180 156 8-18 220 180 156 8-18
125 140 125 411 95 95 240 20 174 8-18 250 210 184 8-18 250 210 184 8-18
150 140 142.5 447 95 95 265 225 199 8-18 285 240 211 8-22 285 240 211 8-22
200 152 170 607 190 308 320 280 254 8-18 340 295 266 8-22 340 295 266 12-22
250 165 192.5 688 190 308 375 335 309 12-18 395 350 319 12-22 405 355 319 12-26
300 178 222.5 742 190 308 440 395 363 12-22 445 400 370 12-22 460 410 370 12-26
350 190 252.5 797 190 308 490 445 413 12-22 505 460 429 16-22 520 470 429 16-26
400 216 282.5 930 270 466 540 495 463 16-22 565 515 480 16-26 580 525 480 16-30
450 222 307.5 975 270 466 595 550 518 16-22 615 565 530 20-26 640 585 548 20-30
500 229 335 1065 270 466 645 600 568 20-22 670 620 582 20-26 715 650 609 20-33
600 267 390 1225 457 625 755 705 667 20-26 780 725 682 20-30 840 770 720 20-36
700 292 447.5 1343 457 625 860 810 772 24-26 895 840 794 24-30 910 840 794 24-36
800 318 507.5 1436 457 625 975 920 878 24-30 1015 950 901 24-33 1025 950 901 24-39
900 330 557.5 1616 598 853 1075 1020 978 24-30 1115 1050 1001 28-33 1125 1050 1001 28-39
1000 410 615 1711 598 853 1175 1120 1078 28-30 1230 1160 1112 28-36 1255 1170 1112 28-42
1200 470 727.5 1971 598 853 1405 1340 1295 32-33 1455 1380 1328 32-39 1485 1390 1328 32-48
1400 530 837.5 2218 860 1345 1630 1560 1510 36-36 1675 1590 1530 36-42 1685 1590 1530 36-48
1600 600 957.5 2578 860 1345 1830 1760 1710 40-36 1915 1820 1750 40-48 1930 1820 1750 40-56
1800 670 1057.5 2689 860 1345 2045 1970 1918 44-39 2115 2020 1950 44-48 2130 2020 1950 44-56
2000 760 1162.5 3022 952 1592 2265 2180 2125 48-42 2325 2230 2150 48-48 2345 2230 2150 48-62

 

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