Butterfly Valves · Triple Offset Butterfly Valves
WCB Triple Eccentric Butterfly Valves
WCB triple eccentric butterfly valves execute the triple-offset metal-sealing principle in a WCB cast body with a 304 + flexible graphite seal: the geometry wipes the disc clear of the seat on travel, and the graphite route keeps sealing where elastomers burn out, to 425 C in WCB and 650 C in stainless-steel executions. The benchmark execution spans DN100 to DN2000 at PN10/PN16/PN24.
Part of the Triple Offset Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | DN100 to DN2000 |
|---|---|
| size range | DN700 |
| pressure class | PN10/PN16/PN24 |
| pressure class | PN16 |
| seat materials | 304 + Flexible Graphite |
| stem materials | Stainless Steel |
| body materials | WCB |
| operation | Electric actuated |
| temperature range | -29 to 425 C (WCB body); -40 to 650 C (stainless steel) |
| temperature range | -29℃~425℃ |
| design standards | DIN 3202, DIN 2501 PN10/PN16 |
| medium | Water, Steam, Oils, Nitrose, Acetic Acid |
| disc material | CF8 |
| stem material grade | F6A |
| seat material | WCB+cobalt-chromium hardfacing alloy |
| sealing ring material | CF8+cobalt-chromium hardfacing alloy |
| end connection | BW |
| test and inspection | API 598/ISO 5208 |
| asme class | CL150 |
Application & selection guidance
Select this execution for large-bore hot lines - metallurgical, power, petrochemical and municipal distribution - where media up to 425 C in the WCB body (water, steam, oils, nitrose, acetic acid) rule out resilient seats and the three-eccentric wear-free closure keeps seat life long at high cycle counts. Size inside DN100 to DN2000 against PN10 to PN24, and confirm the -29 to 425 C WCB window (or the -40 to 650 C stainless route) against the line design temperature.
Frequently asked questions
What does the triple eccentric sealing structure change at large bore?
The three offsets move the seat cone so the disc touches the seal only at the final closing angle - the benchmark page notes seat and disc see almost no wear. In a DN100 to DN2000 body, where seat rub at every stroke would destroy a conventional seat, that geometry is what makes metal-to-metal (304 + flexible graphite) sealing practical at PN10 to PN24.
How hot can this execution run?
The benchmark page declares -29 to 425 C for the WCB body and -40 to 650 C for the stainless steel execution, with the seal ring in stainless steel carrying both low and high temperature sealing. Choose the body route against the line design temperature: WCB to 425 C, stainless beyond it.
What information is needed to quote a WCB triple eccentric butterfly valve?
Nominal size within DN100 to DN2000, the PN10, PN16 or PN24 rating, medium and design temperature against the body-route windows, and the mating flange standard (DIN 3202, DIN 2501 PN10/PN16 per the benchmark page). Those points fix the body material route and seat build.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — 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 — 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 — seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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