The butterfly or wafer damper can be a stack damper where sealing or tight shut-off is not all-important. This type is used as an isolating damper for flue-gas scrubbers. The butterfly damper is lightweight, simple, quickly actuated and often comparatively low in cost. In process work, oval shapes adapt to that shape of duct. Occasionally, a double-disc butterfly appears resembling a circular two-bladed louver damper. The drive for a butterfly damper is also simple, needing only 90° of motion. The torque requirement can vary widely over damper life, if corrosion and thermal effects are severe. Hand levers, Gear boxes, Pneumatic Actuators or Electric actuators are used to actuate butterfly dampers.

Size Range : 8”- 120” Above on Request.

  • Body : IS 2062 Gr. B
  • Disc : IS 2062 Gr. B
  • Shaft : AISI 410
  • Bearing : Standard
  • Gland Pata : IS 2062 Gr. B
  • Graphite Ring : Graphite
  • Hex Bolt : SS 202 / SS 304
  • Seat Ring : IS 2062 Gr. B
  • Bottom Shaft : AISI 410

Wafer Type Damper Valve

“4Matic” Manual (Handle / Gear) Operated Damper Valve for flow Control of Air & Gas.

Size Range : 1.1/2″ to 20″

TEST PRESSURE
TESTING BODY SEAT
HYDRAULIC 10 kG/CM2 5% Leakage
PRESSURE / TEMPERATURE RATING
PRESSURE RATING PN 6 ( MAXIMUM )
OPERATING TEMPERATURE RANGE -25 °C TO 400 °C (DEPENDING ON MOC ) UPTO 600 °C
No. Description Material Qty.
1 Body Gry Iron / C.S. / D.I. / CF8 / CF8M 01
2 Disc C.S. / WCB / CF8 / CF8M 01
3 Shaft AISI 410 / AISI 304 / AISI 316 / AISI 316L 01
4 Grafoil Ring Graphite 01
5 Bering Bush Metal Bush PTFE Coated 01
6 Nut & Bolt S.S. 202 / S.S. 304 02
7 Bottom Shaft AISI 410 / AISI 304 / AISI 316 / AISI 316L 01
8 Grafoil Ring Graphite 01
9 Dowel Pin IS 2062 Gr. B 01
10 Bottom Cover IS 2062 Gr. B 01
No. Description Material Qty.
1 Body Gry Iron / C.S. / D.I. / CF8 / CF8M 01
2 Disc C.S. / WCB / CF8 / CF8M 01
3 Shaft AISI 410 / AISI 304 / AISI 316 / AISI 316L 01
4 Grafoil Ring Graphite 01
5 Bering Bush Metal Bush PTFE Coated 01
6 Nut & Bolt S.S. 202 / S.S. 304 02
7 Bottom Shaft AISI 410 / AISI 304 / AISI 316 / AISI 316L 01
8 Grafoil Ring Graphite 01
9 Dowel Pin IS 2062 Gr. B 01
Dimensions : (All Dimensions are in mm)
Valve Model Valve Size PORT A B C ØD
MM INCH
4M-WDV-40 40 1.1/2″ 40 55.5 81.5 33.5 85
4M-WDV-50 50 2″ 50 60.5 100 43.5 80
4M-WDV-65 65 2.1/2″ 65 68 107.5 46 102
4M-WDV-80 80 3″ 80 75.5 115 46 125
4M-WDV-100 100 4″ 100 85.5 125 52 139
4M-WDV-125 125 5″ 125 108.5 167.5 56 168
4M-WDV-150 150 6″ 150 121 180 56 204
4M-WDV-200 200 8″ 200 146 205 60 252
4M-WDV-250 250 10″ 245 221 271 68 316
4M-WDV-300 300 12″ 295 252 296 78 362
4M-WDV-350 350 14″ 340 271 312 78 410
4M-WDV-400 400 16″ 388 300 365 102 470
4M-WDV-450 450 18″ 450 332 368 90 540
4M-WDV-500 500 20″ 490 377 420 90 622

“AFT” Double Flange Damper Valve

“4Matic” Gear Operated MS Fabricated Body With MS Fabricated Disc.

Size Range : 8″ to 80″

PRESSURE / TEMPERATURE
WORKING RATING 5 KG/CM 2
TEMPERATURE UPTO 1200 °C
No. Description Material Qty.
1 Body IS 2062 Gr. B 01
2 Disc IS 2062 Gr. B 01
3 Shaft AISI 410 01
4 Bearing Standard 02
5 Gland Pata IS 2062 Gr. B 02
6 Grephite Ring Graphite 02
7 Hex Bolt S.S. 202 / S.S. 304 02
8 Seat Ring IS 2062 Gr. B 02
9 Bottom Shaft AISI 410 01
Valve Model Valve Size ØA ØB n ØC D E F
MM Inch
AFT-MS-G-200 200 8″ 320 280 8 18 340 440 150
AFT-MS-G-250 250 10″ 375 335 12 18 366 466 150
AFT-MS-G-300 300 12″ 440 395 12 22 398 498 150
AFT-MS-G-350 350 14″ 490 445 16 22 450 550 150
AFT-MS-G-400 400 16″ 540 495 16 22 450 550 150
AFT-MS-G-450 450 18″ 595 550 16 22 478 578 150
AFT-MS-G-500 500 20″ 645 600 20 22 502 602 200
AFT-MS-G-550 550 22″ 749 692 20 22 610 710 200
AFT-MS-G-600 600 24″ 755 705 20 26 610 710 200
AFT-MS-G-650 650 26″ 785 744 20 26 635 735 200
AFT-MS-G-700 700 28″ 860 810 24 26 610 710 200
AFT-MS-G-750 750 30″ 887 846 24 26 633 723 200
AFT-MS-G-800 800 32″ 975 920 24 30 678 768 200
AFT-MS-G-850 850 34″ 1005 957 24 30 692 782 200
AFT-MS-G-900 900 36″ 1075 1020 24 30 728 818 250
AFT-MS-G-1000 1000 40″ 1175 1120 28 30 778 868 250
AFT-MS-G-1100 1100 44″ 1276 1222 32 33 948 1038 250
AFT-MS-G-1200 1200 48″ 1405 1340 32 33 1022 1112 250
AFT-MS-G-1400 1400 56″ 1630 1560 36 36 1025 1095 300
AFT-MS-G-1600 1600 64″ 1830 1760 40 36 1125 1195 300
AFT-MS-G-1800 1800 72″ 2045 1970 44 39 1252 1302 300
AFT-MS-G-2000 2000 80″ 2265 2180 48 42 1462 1562 300

Size Upto 3000 MM On Request