Valve Insulation: Heat Loss & Savings
Bare valves are one of the biggest avoidable heat losses on any steam or hot-process plant — a single uninsulated gate or control valve can radiate several kilowatts continuously. Because valves are operated and inspected, they are usually left bare; removable valve insulation jackets solve exactly that. The same product goes by several names — insulated valve jackets, valve jackets, valve insulation blankets or valve covers — all meaning a tailored, removable insulation cover for a valve.
Heat loss vs insulated — by surface temperature
| Surface temp | Bare loss | Insulated | Outer surface | Reduction |
|---|---|---|---|---|
| 150 °C | 2,564 W/m² | 138 W/m² | 29 °C | 94.6% |
| 250 °C | 5,822 W/m² | 154 W/m² | 30 °C | 97.4% |
| 350 °C | 10,860 W/m² | 259 W/m² | 37 °C | 97.6% |
| 430 °C | 16,665 W/m² | 360 W/m² | 44 °C | 97.8% |
Per-m² flat-surface flux, ASTM C680 / ISO 12241, 50 mm Lamella (≤220 °C) or 100 mm Wired mat (>220 °C), 20 °C ambient. Multiply by the bare area.
Worked examples (per year, 8,000 h, natural gas)
| Item | Heat saved | Energy/yr | CO₂/yr | € saved/yr |
|---|---|---|---|---|
| A gate valve (0.35 m², 350 °C) | 3.7 kW | 35 MWh | 7.1 t | €2,025 |
| A safety valve (0.65 m², 250 °C) | 3.7 kW | 35 MWh | 7.0 t | €2,011 |
FAQ
How much heat does a bare valve lose?
At 20 °C ambient (ASTM C680): a gate valve (~0.35 m², 350 °C) loses about 3.7 kW; a safety valve (~0.65 m², 250 °C) about 3.7 kW. Insulating a gate valve saves ≈35 MWh and ≈7.1 t CO₂ per year (8,000 h).
Can you insulate gate and similar?
Yes. Valves need to be turned, serviced and inspected, so fixed cladding gets cut away and never refitted. Inzonex removable valve insulation jackets (valve jackets / valve insulation blankets) unzip in minutes and refit with no damage. Inzonex covers gate, globe, control, butterfly, check and safety valves. The outer surface drops to a touch-safe ≤45 °C and the part stays serviceable.
How much does valve insulation save?
Each item saves 96–98% of its bare loss. A gate valve at 350 °C saves ≈2,025 €/yr of energy (≈35 MWh, ≈7.1 t CO₂) at typical gas prices; payback is usually under two years.
What insulation thickness is used?
Up to 220 °C surface: 50 mm mineral-wool (Lamella); above 220 °C: 100 mm (Wired mat), because conductivity rises with temperature. Both keep the outer surface ≤45 °C.