Butterfly Valves for Coke Oven & Steel Plants
Knife gate valves for blast furnace gas and tar service, large-bore butterfly valves for BFG distribution mains, and IBR-certified steam valves for integrated steel plant cogeneration.
Which butterfly valves are used for coke oven & steel plants?
Integrated steel plants (ISPs) present a unique valve challenge: massive flow volumes of blast furnace gas (BFG) at very low pressure (2,000–5,000 mmWC), highly abrasive and sticky coke oven gas (COG) containing naphthalene and tar, extreme-temperature hot metal and slag systems, and high-pressure steam from waste heat boilers. Vajra Industrial Solutions supplies the specialised valve types required at each stage - knife gate valves for BFG with tar deposits, large-bore butterfly valves on BFG distribution mains, and IBR-certified gate/globe/check valves for the cogeneration steam cycle.
Butterfly Valve (Large Bore)
BFG main distribution headers (DN600–DN2400); low pressure, large flow; double-offset for tight shutoff
Critical Requirements
- BFG valves must accommodate sticky tar deposits - knife gate or through-conduit design; no wedge gate (tar packs the body cavity)
- Large-bore butterfly valves for BFG (DN600–DN2400) - double-offset design for bubble-tight shutoff required at change of wind direction
- IBR certification mandatory for all steam valves above 3.5 kg/cm² in Indian steel plants - Form III-C material and Form III-E hydrostatic test
- Blast furnace water cooling valves - continuous service, no shutoff allowed; use dual parallel valves for maintenance
- Coke oven gas (COG) - naphthalene deposition blocks small ports; use full-bore valves only; minimum DN50
- IS 6157 compliance for BFG gate valves manufactured in India
Service Challenges
- Blast Furnace Gas (BFG) - CO 22–25%, CO₂ 22%, N₂ 51%, H₂ 4%; toxic and flammable; very low calorific value (700–900 kcal/m³); tar and dust laden
- Coke Oven Gas (COG) - H₂ 55%, CH₄ 26%, CO 7%; high CV (4,500 kcal/m³); naphthalene deposition at <80°C blocks valve ports
- COREX/FINEX gas - similar to BFG with higher dust content; full-bore knife gate essential
- Hot metal and slag - no conventional valves; trough gates and slag pots (not standard inventory items)
- Cooling water - scale formation on soft water circuits; duplex SS for high-chloride cooling towers
Vajra Butterfly Valves
Compact and efficient butterfly valves for large-scale flow control and isolation.
See the full Butterfly Valves rangeOther valves for coke oven & steel plants
Butterfly Valves for other applications
Connected Engineering
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