Butterfly Valves Β· Triple Offset Butterfly Valves
Flanged Triple Offset Butterfly Valves
Flanged triple offset butterfly valves are the flanged-end execution of the triple offset geometry: three distinct offsets place the seat axis off the body centreline so the disc cams into the seat with friction-free, bidirectional metal-to-metal sealing, and the flanged ends bolt straight into class-rated pipework without clamp lugs. The benchmark execution declares a cast steel A216 WCB body, disc, gland and retaining-ring package across DN50 to DN500 at PN10 to PN63 and Class 150 to Class 1500, graphite gasketing with an SS304+graphite seal ring, and gear, electric or pneumatic operation.
Part of the Triple Offset Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN500 |
|---|---|
| pressure class | PN10 to PN63, Class 150 to Class 1500 |
| disc materials | ASTM A216 WCB |
| body materials | ASTM A216 WCB |
| end connections | Flanged |
| operation | Gear Operated, Electric Actuated, Pneumatic Actuated |
| design standards | BS5155, EN 593 |
| testing standards | API 598 |
| face to face | ASME B16.5, DIN 3202 F4, EN 558-1 |
| gland materials | ASTM A216 WCB |
| gasket materials | Graphite |
| seal ring materials | SS304+Graphite |
| retaining ring materials | ASTM A105 |
| end cap materials | ASTM A105 |
| flange standards | DIN, ANSI B16.1, BS4504, EN 1092 |
Application & selection guidance
Specify this execution where a fire-safe-minded, zero-leakage metal seat is required and the line calls for flanged ends rather than a wafer or lug body: steam, hydrocarbon and high-temperature duties inside PN10 to PN63 or Class 150 to Class 1500. Size within DN50 to DN500, choose the operator for torque and fail-safe needs, and confirm the face-to-face (DIN 3202 F4 / EN 558-1 family) against the mating flange standard before ordering.
Frequently asked questions
Triple offset vs double offset butterfly valve - what changes?
Double offset geometry still uses an interference seat, so sealing rubs and soft or graphite seals wear. The third offset cams the disc into the seat perpendicular to the axis, making sealing friction-free and fully metal-to-metal - tight shutoff at high temperature with a seat that does not rub itself apart. For steam, hydrocarbons and other hot duties inside the declared class range, the triple offset execution is the durable choice.
Why a flanged body instead of wafer or lug?
Flanged ends bolt directly to matching class flanges, which suits pipework specified to DIN or ANSI B16.1-class flange standards and simplifies removal for maintenance in heavier service. Wafer and lug bodies save length, but where the plant standard expects bolted joints, the flanged execution installs without special clamp length planning.
What information is needed to quote a flanged triple offset butterfly valve?
Nominal size in the DN50 to DN500 band, pressure class (PN10 to PN63 or Class 150 to Class 1500), operator choice (gear, electric, pneumatic), the mating flange standard, and the medium with its temperature. Those points fix the execution, seal ring and operator for a quotation-ready inquiry.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage β seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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