Gate Valves for Hot Oil (Thermal Heat Transfer Fluid) Service

Which gate valves configuration suits Hot Oil (Thermal Heat Transfer Fluid), in which material, to which standard — from real service data, with the pitfalls flagged.

Which gate valves for Hot Oil (Thermal Heat Transfer Fluid)?

Gate Valve (OS&Y, cast steel, metal seated) - Standard isolation for hot oil mainline - low pressure drop, suitable to 400°C. Typical service window: 1–15 bar (circulation system pressure), 150–400°C (design temperature drives alloy steel selection above 370°C).

Recommended Configurations

Gate Valve (OS&Y, cast steel, metal seated)

Standard isolation for hot oil mainline - low pressure drop, suitable to 400°C.

Body Material for Hot Oil (Thermal Heat Transfer Fluid)

Rated from real compatibility data - click any material for the full decision page.

Carbon SteelStandard material for all hot oil service up to 400°C at Class 150–300.Excellent SS 316Acceptable but not normally required unless process contamination is a concern.Excellent A217 WC6 (1¼Cr-½Mo)Required above 370°C for long-term creep resistance per ASME B16.34.Excellent Cast IronNot recommended - brittle at thermal cycling; use carbon or alloy steel.Poor PTFE seatsPTFE has a 200°C maximum - metal seats required for hot oil above 200°C.Not Recommended

Governing Standards for Hot Oil (Thermal Heat Transfer Fluid) Service

ASME B16.34 API 600 (cast steel gate/globe)ASME B31.3 (process piping)

What to Avoid in Hot Oil (Thermal Heat Transfer Fluid) Service

PTFE-seated ball valves (temperature limit exceeded)
Cast iron body valves (thermal shock and brittleness risk at high temperature)
Plastic or elastomer-sealed valves

Service Considerations

Thermal expansion - hot oil systems experience significant pipe expansion; flexible connections near valves
Fire risk: hot oil leaked onto surfaces above its autoignition temperature can self-ignite - fire-safe valves required
Graphite packing mandatory above 200°C - PTFE packing will fail
Thermal cycling: valve bodies should be specified for the full temperature range including cold start

Other valve types for Hot Oil (Thermal Heat Transfer Fluid)

Globe Valves for Hot Oil (Thermal Heat Transfer Fluid)Ball Valves for Hot Oil (Thermal Heat Transfer Fluid)Check Valves for Hot Oil (Thermal Heat Transfer Fluid)

Gate Valves for other services

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Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026

Connected Engineering

Standards

API 6D ASME B16.34

Products

Gate Valves

Comparisons

Gate vs Ball Valve

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Relevant Products

Vajra Gate Valves

Engineering references

Hot Oil (Thermal Heat Transfer Fluid) service guideFull compatibility, standards & considerations Vajra Gate ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ