hydrocarbon
Valves for Hot Oil (Thermal Heat Transfer Fluid) Service
Hot oil or thermal fluid is used as a heat transfer medium in indirect heating systems - circulated through heaters and heat exchangers to transfer heat without generating steam. Common fluids: Therminol VP-1, Dowtherm A, Marlotherm SH, Mobiltherm 605. Operating temperatures reach 300–400°C at relatively low gauge pressure (1–10 bar).
Pressure Range
1–15 bar (circulation system pressure)
Temperature
150–400°C (design temperature drives alloy steel selection above 370°C)
Industries
Chemical plant indirect heating, Textile processing, Food processing (frying, drying)
What valves are used for Hot Oil (Thermal Heat Transfer Fluid) service?
Gate Valve (OS&Y, cast steel, metal seated) are recommended for Hot Oil (Thermal Heat Transfer Fluid) service: Standard isolation for hot oil mainline - low pressure drop, suitable to 400°C..
Key Properties - Hot Oil (Thermal Heat Transfer Fluid)
- Operating temperature: 150–400°C at 1–10 bar gauge
- Thermally stable synthetic or mineral oil base
- Low vapour pressure at operating temperature - low pressure despite high temperature
- Degrades over time - TAN (Total Acid Number) and viscosity must be monitored
- Flash point typically 150–200°C - fire hazard if leaked onto hot surfaces
Vajra Industrial Solutions manufactures and supplies valves for Hot Oil (Thermal Heat Transfer Fluid) service — including gate valve (os&y, cast steel, metal seated) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Hot Oil (Thermal Heat Transfer Fluid) service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Hot Oil (Thermal Heat Transfer Fluid)
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/A105) | Excellent | Standard material for all hot oil service up to 400°C at Class 150–300. |
| SS 316 | Excellent | Acceptable but not normally required unless process contamination is a concern. |
| A217 WC6 (1¼Cr-½Mo) | Excellent | Required above 370°C for long-term creep resistance per ASME B16.34. |
| PTFE seats | Not Recommended | PTFE has a 200°C maximum - metal seats required for hot oil above 200°C. |
| Cast Iron | Poor | Not recommended - brittle at thermal cycling; use carbon or alloy steel. |
Recommended Valves
Gate Valve (OS&Y, cast steel, metal seated)
Standard isolation for hot oil mainline - low pressure drop, suitable to 400°C.
Full selection guideGlobe Valve (cast steel, metal seated)
Flow control and modulating service on hot oil supply to heat exchangers.
Full selection guideBall Valve (trunnion, metal seated, extended stem)
Fast isolation with fire-safe capability and low-emission graphite packing.
Full selection guideCheck Valve (swing or tilting disc, cast steel)
Pump discharge non-return on hot oil circulation pumps.
Full selection guideValves to Avoid
PTFE-seated ball valves (temperature limit exceeded)
Cast iron body valves (thermal shock and brittleness risk at high temperature)
Plastic or elastomer-sealed valves
Standard ANSI 150 flanged connections above 370°C (check P-T ratings - A216 WCB limits)
Special Considerations
Applicable Standards
Shop Valves for Hot Oil (Thermal Heat Transfer Fluid) Service
Other Fluid Services
Hot Oil (Thermal Heat Transfer Fluid) Service — Procurement & Specification
Typical Applications
Available Standards
Material Options
Documentation Available
- -EN 10204 3.1 Material Test Certificates (heat traceable)
- -API 598 hydrostatic shell & seat test reports
- -Dimensional inspection reports
- -Full Manufacturing Data Record (MDR) / data book on request
Inspection Options
- -In-house QC inspection on every order
- -Third-party inspection (SGS / Bureau Veritas / TÜV / DNV) coordination
- -Witness and hold points accommodated on request
Order Quantities
Flexible — from single critical-spare valves to full project lots.
Export
Worldwide export with complete documentation (COO, EUR.1, packing lists) to 20+ countries.
Custom Engineering
Built to your specification — materials, trim, pressure class and special service (NACE, fire-safe, IBR, cryogenic).
Delivery Support
Dispatch from Vadodara, Gujarat with documented lead times and priority handling for urgent requirements.
Engineering references
Connected Engineering
Need Valves for Hot Oil (Thermal Heat Transfer Fluid) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.