Valves for Boiler Feedwater (BFW) Service
Boiler feedwater is highly purified, deaerated, and chemically dosed water supplied to steam boilers at pressure and elevated temperature. It is one of the most common valve service conditions in industrial plants. BFW is relatively benign to materials when properly treated (low dissolved oxygen, controlled pH 8.5–9.5, low TDS) but the high pressure and temperature demand proper pressure class selection, and erosion from high-velocity flow is a key concern for globe and gate valves.
Pressure Range
20–200 barg (boiler operating pressure + pump head)
Temperature
100–360°C
Industries
Thermal power plants, Refineries, Chemical plants
Key Properties — Boiler Feedwater (BFW)
- Treated, deaerated water: pH 8.5–9.5, very low TDS and dissolved oxygen
- High temperature: 100–360°C; high pressure: 20–200+ barg
- Erosion concern at high velocity — globe and gate valve trim must be hardened
- Oxygen scavenging chemicals (hydrazine or carbohydrazide) dosed upstream
- IBR (Indian Boiler Regulations) certification required in India for steam circuits
Material Compatibility — Boiler Feedwater (BFW)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Carbon Steel (WCB/WC6/WC9) | Excellent | Standard material for BFW valves up to Class 2500. |
| A217 WC6 (1.25Cr-0.5Mo) | Excellent | For high-temperature BFW above 400°C. |
| SS 316L | Good | Used where specific chemical treatment demands SS, or pharmaceutical BFW. |
| Stellite trim (seat/disc) | Excellent | Mandatory for BFW globe valve and gate valve trim — erosion and galling resistance. |
Recommended Valves
Gate Valve (OS&Y, WCB/WC6)
Isolation on BFW headers and boiler connections — API 600 pattern, IBR certifiable
Globe Valve (Stellite trim, IBR)
Control valve for BFW flow regulation to boiler — Stellite seat/disc mandatory
Check Valve (lift/piston type)
Protection of BFW pump against reverse flow on pump discharge
Safety Relief Valve (IBR certified)
Mandatory per Indian Boiler Regulations on boiler steam drum connections
Needle Valve
Isolation of pressure gauges, level gauges, and instrumentation on BFW lines
Valves to Avoid
Ball valves for throttling BFW (high erosion at partial open)
Cast iron valves for high-pressure BFW
Special Considerations
Applicable Standards
Shop Valves for Boiler Feedwater (BFW) Service
Other Fluid Services
Need Valves for Boiler Feedwater (BFW) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard.