Damper Butterfly Valve supplier in Ahmedabad, Gujarat. MS (IS 2062) / CI (IS 210) / SS304 / SS316 body — MS or SS disc — metal-to-metal / PTFE rope / ceramic fibre seal (gas tight on request) — manual lever…
Damper Butterfly Valve Supplier India | MS CI SS Body | Air Gas Flue Gas Duct | Manual Gear Motorised Pneumatic | DN50–DN2000 | Power Plant Cement Steel HVAC | KELOR
Price on Request
About Company
KRISHNA INDUSTRIES
GST No. : 24AKLPP6499B1ZT
Ahmedabad, Gujarat, India
Manufacturer, Traders & Wholesale Supplier
Year of Establishment : Since 1985
Annual Turnover : Below Rs. 25 Crore Approx.
Banker : APANI SAHAKARI BANK LIMITED
Company CEO : Ruchin Panchal
Constitution of Business : Proprietorship
Leading Valve Supplier in India covering Maharashtra, Gujarat, Tamil Nadu, Karnataka, Telangana, Delhi NCR, West Bengal, Rajasthan, Madhya Pradesh, Uttar Pradesh, Punjab, Haryana, Andhra Pradesh, Odisha, Chhattisgarh, Jharkhand, Bihar, Kerala, Assam.
Damper Butterfly Valve Supplier India | MS / CI / SS Body | Air / Gas / Flue Gas Duct Service | Manual / Gear / Motorised / Pneumatic | DN50–DN2000 | Power Plant / Cement / Steel / HVAC | KELOR
Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B MOQ: 10 Nos | Body: MS / CI / SS304 / SS316 Service: Air / Gas / Flue Gas Duct | Sizes: DN50–DN2000 | Temp: Up to 400°C
Damper Butterfly Valve Supplier in India
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, supplies Damper Butterfly Valves — MS (IS 2062) / CI (IS 210) / SS304 / SS316 body — MS or SS disc — metal-to-metal / PTFE rope / ceramic fibre seal — gas tight on request — manual lever / gear operated / electric motorised (on/off and modulating 4-20mA) / pneumatic actuated (spring return) — flanged / wafer / lug — DN50 (2″) to DN2000 (80″) — atmospheric to PN6 — up to 400°C — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad.
A damper butterfly valve is specifically designed for air, gas, flue gas, and low-pressure duct service — not for liquid pipelines. Furthermore, it handles the large bore, high temperature, and low pressure conditions of industrial duct systems that standard resilient-seated butterfly valves cannot address. Consequently, specifying the correct valve type — damper for duct service, resilient-seated BFV for liquid pipeline service — prevents both premature valve failure and unnecessary cost.
These are two fundamentally different products despite both being called butterfly valves. Specifying the wrong type results in either premature failure or significant cost overrun. Therefore, always confirm which type is required before ordering.
Feature
Damper Butterfly Valve (This Page)
Resilient Seated Butterfly Valve (Process BFV)
Primary Service
✅ Air, gas, flue gas, combustion air, duct service — not for liquids
✅ Water, HVAC chilled water, chemical, process liquid — not for hot gas duct service
Sealing
Metal-to-metal, PTFE rope, or ceramic fibre — some leakage acceptable at closed position — designed for flow REGULATION not tight isolation (gas tight on special request)
Resilient rubber seat (EPDM/NBR/PTFE) — zero leakage (Class VI) when closed — designed for tight ISOLATION
Temperature
✅ Up to 400°C — MS/CI/SS body handles elevated temperature — no rubber to degrade at high temp
Limited to seat material temperature — EPDM to 120°C — PTFE to 180°C — rubber seat degrades rapidly in hot gas service above these limits
Pressure
Atmospheric to PN6 (low pressure duct) — optimised for large bore low pressure flow regulation
PN10 / PN16 — designed for pressurised liquid pipeline service — not optimised for atmospheric duct
Size Range
✅ DN50 to DN2000 and above — large bore duct sizes standard
DN50 to DN600 typically — large bore above DN600 uncommon
Body Construction
MS fabricated / CI cast — economical for large bore duct — no rubber lining required
CI / DI / SS casting — rubber seat moulded into body — more expensive construction per unit
Specify When
✅ Power plant flue gas, boiler combustion air, HVAC ductwork, cement kiln exhaust, furnace gas, dust extraction, pollution control duct systems
✅ Water supply, sewage, HVAC chilled water, chemical pipeline, fire fighting, irrigation — any pressurised liquid pipeline application
Body Material Selection by Service Temperature
Body Material
Temperature Limit
Specify For
Not For
MS (IS 2062)
Up to 250°C continuous
✅ Ambient air HVAC ductwork, dust extraction, ventilation systems, low temperature flue gas — most economical — standard for Indian HVAC and industrial ventilation duct dampers — epoxy or aluminium paint coating for mild corrosion protection
Flue gas above 250°C — MS oxidises and scales at higher temperature — replace with CI or SS for higher temp service
CI (IS 210 FG260)
Up to 300°C continuous
✅ Boiler induced draft (ID) and forced draft (FD) fan duct dampers — moderate temperature flue gas — cement plant raw mill and preheater exhaust — sugar mill boiler exhaust — standard for Indian boiler and cement plant duct damper service where temperature is moderate
Thermal shock service — rapid heating/cooling cycles crack CI — CI also corrodes in acid dew point condensate service
SS304 (AISI 304)
Up to 400°C oxidising service
✅ High temperature flue gas and furnace exhaust where MS/CI oxidises — kiln exhaust, incinerator duct, high temperature process gas — clean non-sulphur flue gas above 300°C
Sulphur-containing flue gas (coal-fired power plant, sulphur recovery unit) — SS304 sulphidation above 315°C — specify SS316 or special alloy
SS316 (AISI 316)
Up to 400°C with better corrosion resistance
✅ Sulphur-containing flue gas — coal-fired boiler exhaust — sour gas duct — chemical plant corrosive gas exhaust — where SO2/SO3 or acid dew point condensate attacks SS304
Very high temperature above 400°C — specify heat-resistant alloy (Inconel, SS310) for above 400°C service
Lock lever at required damper position for fixed air balancing — not for frequent adjustment
Gear Operated Handwheel
DN150–DN600 — where lever torque too high — manual operation from accessible platform
Position indicator confirms disc angle — critical for setting damper position on large duct fans
Electric Motorised (On/Off)
Any size — remote open/close from DCS/PLC — boiler fan damper control, HVAC AHU isolation
220V AC standard — confirm single phase availability — position feedback limit switches to DCS
Electric Motorised (Modulating 4-20mA)
Any size — variable airflow control — combustion air ratio control, VAV HVAC system, FGD inlet damper
✅ Positioner converts 4-20mA signal to disc angle — position transmitter sends actual position back to DCS — standard for power plant combustion air and FGD damper control
Pneumatic (Spring Return)
Fast closure — boiler emergency trip — furnace isolation on flame failure — where rapid closure is a safety requirement
Spring return to closed on air failure — fail-safe closure — confirm spring return direction at order
Technical Specifications
Parameter
Specification
Valve Type
Damper butterfly valve — single disc — centre shaft or offset shaft
Body Material
MS IS 2062 (to 250°C) / CI IS 210 (to 300°C) / SS304 AISI 304 (to 400°C) / SS316 AISI 316 (sulphur/corrosive gas to 400°C)
Up to 250°C (MS) / up to 300°C (CI) / up to 400°C (SS304/SS316)
Operation
Manual lever / Gear handwheel / Electric motorised on/off / Electric modulating 4-20mA / Pneumatic spring return
Leakage Class
Standard: Class II/III (regulation) — Gas tight: Class VI (special order)
MOQ
10 Nos (DN50–DN600 standard) — single piece for DN600+ fabricated to order
HSN Code
84818090
Applications in Indian Industries
Power Plants — Flue Gas and Combustion Air
CI or SS304 body motorised modulating DN300–DN1200. Boiler combustion air control — FD fan outlet damper modulates combustion air flow for fuel-air ratio control. ID fan inlet damper controls draught. FGD (flue gas desulphurisation) inlet isolation. Moreover, SS316 body for sulphur-containing coal flue gas where CI body sulphidation is a concern. Electric modulating 4-20mA with position feedback — standard for power plant DCS combustion control.
Cement Plants — Kiln and Preheater Exhaust
CI or SS304 body gear operated and motorised DN400–DN1000. Preheater exhaust gas control damper — kiln inlet and outlet duct isolation — raw mill separator bypass. High dust loading in cement kiln exhaust requires robust disc construction with hard-faced disc edge for abrasion resistance. Furthermore, thermal shock resistance important for CI body dampers on kiln systems with rapid startup and shutdown cycles.
HVAC Systems — Air Handling Units and Ductwork
MS body electric motorised on/off and modulating DN100–DN600. AHU fresh air and return air dampers — VAV (variable air volume) terminal unit control — fire damper coordination. Electric modulating 4-20mA with BMS integration for variable air volume control. Furthermore, spring return pneumatic damper for fire/smoke isolation where fail-safe closure on power/air failure is a fire safety requirement.
Steel Plants — Furnace and Blast Furnace Gas
SS304 or SS316 body motorised DN200–DN800. Blast furnace gas (BFG) distribution control, coke oven gas (COG) isolation, converter gas recovery. Gas tight specification required for blast furnace gas — toxic CO content demands zero leakage isolation. Therefore, specify gas tight damper (Class VI) with confirmed material compatibility for CO-containing BFG service.
Pollution Control — Bag Filter and ESP Inlet
MS or CI body gear operated DN300–DN800. Bag filter inlet flow distribution dampers, ESP inlet isolation, chimney bypass. Inlet isolation damps for maintenance access — must close against full induced draft fan pressure. Position indicator confirms closed position before maintenance personnel enter filter housing. Additionally, motorised version for automated inlet switching between parallel filter chambers.
Related Products — Krishna Industries (KELOR)
Gear Operated Butterfly Valve — CI body resilient seated BFV for liquid pipeline service — when liquid isolation not gas duct damping is required
Electric Actuated Butterfly Valve — CI body resilient seated electric BFV for liquid pipeline automation — HVAC chilled water, ETP/STP
WCB Knife Gate Valve — for slurry and solid-laden duct media — cement slurry and ash slurry isolation where damper butterfly valve is not suitable
MS Fabricated Basket Strainer — upstream particle protection on gas lines where particulates damage damper disc and seals
Frequently Asked Questions
1. What is the difference between a damper butterfly valve and a standard butterfly valve?
A standard resilient-seated butterfly valve is designed for liquid pipeline service — it has a rubber (EPDM, NBR, or PTFE) seat that provides zero leakage isolation at pressures up to PN16. A damper butterfly valve is designed for air, gas, and flue gas duct service — it has metal-to-metal or ceramic sealing (no rubber seat) and is rated for atmospheric to low PN6 pressure and temperatures up to 400°C. If a rubber-seated process butterfly valve is installed in hot flue gas service, the rubber seat degrades rapidly and the valve fails within weeks. Therefore, always specify damper type for duct service and resilient-seated type for liquid pipeline service.
2. Does a damper butterfly valve provide tight shut-off?
Standard damper butterfly valves with metal-to-metal sealing provide Class II or Class III leakage — some gas passes through the closed disc. This is acceptable for flow regulation and most isolation applications in air and gas duct service. However, if zero leakage is required — blast furnace gas isolation (toxic CO), boiler firebox isolation, gas train shut-off — specify a gas tight damper butterfly valve with Class VI leakage rating at order stage. Gas tight dampers have tighter machining tolerances and may use PTFE rope or graphite seals and cost more than standard regulation dampers.
3. What is the lead time for large bore damper valves above DN600?
Standard sizes DN50–DN600 are available from stock or with 2–3 week lead time. DN600–DN1200 fabricated damper valves typically require 4–6 weeks. DN1200–DN2000 and custom shapes (rectangular duct dampers) require 6–10 weeks. Provide duct size, service temperature, disc material, operator type, and pressure rating for lead time confirmation. For power plant and cement plant project procurement, share the BOM early — large bore dampers on the critical path of a plant commissioning schedule need early ordering.
4. Can damper butterfly valves be used for rectangular ducts?
Standard circular disc damper butterfly valves are for round ductwork. For rectangular duct cross-sections — common in HVAC air handling systems and large cement/power plant ductwork — louvre dampers (multi-blade dampers) are the standard solution rather than single disc butterfly dampers. Krishna Industries can advise on the correct damper type for rectangular duct applications — WhatsApp duct dimensions, service, temperature, and flow rate for recommendation.
5. What is the MOQ?
MOQ is 10 Nos for DN50–DN600 standard sizes. For DN600+ fabricated-to-order damper valves, MOQ is 1 No per size as these are custom fabricated. Every order includes dimensional inspection report, operational test certificate, and GST invoice. For motorised dampers, actuator functional test at specified voltage is included. WhatsApp duct size, service temperature, body material, operator type, and quantity for pricing within 2 hours.
Conclusion
Krishna Industries (KELOR) supplies Damper Butterfly Valves for air, gas, flue gas, and duct service — MS (IS 2062) / CI (IS 210) / SS304 / SS316 body — MS or SS disc — metal-to-metal / PTFE rope / ceramic fibre seal — gas tight on request — manual lever / gear operated / electric motorised on/off and modulating 4-20mA / pneumatic spring return — DN50 (2″) to DN2000 (80″) — atmospheric to PN6 — up to 400°C — GST invoice — Pan India dispatch from Ahmedabad. WhatsApp duct size, service temperature, body material, and operator type for pricing within 2 hours.
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