Butterfly Valves for LNG & Cryogenic
Triple-offset butterfly valves for LNG and cryogenic service combine the cost and weight advantage of a butterfly valve at large bore with metal-seated bubble-tight shut-off and fire-safe performance. Vajra Industrial Solutions supplies cryogenic triple-offset butterfly valves with SS 316L bodies, extended stems, and BS 6364-compliant cryogenic testing for LNG terminal vapour headers, boil-off gas (BOG) systems, and large-bore low-pressure cryogenic service — complementing cryogenic ball valves for smaller bore and high-pressure applications.
Key Applications — Butterfly Valves in LNG & Cryogenic
LNG Boil-Off Gas (BOG) Headers
Triple-offset butterfly valves for large bore LNG boil-off gas headers at LNG terminals and satellite stations. BOG is methane vapour generated from LNG warming — it must be routed to compressors or flare. Large-bore butterfly valves (DN300–DN900) provide cost-effective isolation for BOG headers at Class 150 pressure. Cryogenic extended stem (not full extended bonnet needed for vapour service as process temperature is −80°C to −120°C, not −162°C liquid).
DN300–DN900, Class 150, SS 316L, triple-offset metal seat, cryogenic extended stem
LNG Terminal Vapour Return Lines
Butterfly valves for LNG carrier vapour return lines from ship to shore. During LNG unloading, the displaced vapour from the ship's tanks must be returned to the terminal — typically large bore (DN300–DN600) at low pressure (Class 150). Triple-offset butterfly valves provide bubble-tight shut-off and fire-safe performance at reduced weight and cost compared to equivalent ball valves. Extended stem standard for vapour return headers.
DN300–DN600, Class 150, SS 316L, triple-offset, API 607 fire-safe, extended stem
Industrial Gas Plant — Large Bore Cryogenic Isolation
Cryogenic butterfly valves for air separation units (ASU) — large bore liquid oxygen, liquid nitrogen, and liquid argon streams. At DN300 and above, butterfly valves offer a significant weight and cost advantage over ball valves for low-pressure (Class 150/300) cryogenic service. Oxygen cleaning mandatory for LOX service. Cryogenic functional test per BS 6364.
DN200–DN900, Class 150–300, SS 316L, oxygen-cleaned option, BS 6364 cryogenic test
Required Certifications
Recommended Materials
Selection Factors
Technical FAQs
When should I choose a butterfly valve over a ball valve for LNG service?
Why can't elastomeric-seated butterfly valves be used for LNG service?
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Butterfly Valves for LNG & Cryogenic
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