Butterfly Valves Β· Double Offset Butterfly Valves
Metal Seat Eccentric Butterfly Valves
A metal-seated eccentric butterfly execution for hot and abrasive duty where soft seats cannot survive: DN100 to DN1200 at PN10/16/24, ductile-iron body, metal-to-metal sealing to DIN3202/DIN2501, rated -20 to 200 C for water, wastewater and oil. The eccentric geometry lifts the disc off the seat during travel, so the metal seal does not scrub itself away.
Part of the Double Offset Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | DN100-DN1200 |
|---|---|
| pressure class | PN10/PN16/PN24 |
| body materials | Ductile Iron |
| temperature range | -20 to 200C |
| design standards | DIN3202, DIN2501 PN10/PN16 |
| seal material | Ductile Iron |
| stem material | Stainless Steel |
| medium | Water, Waste Water, Oil |
Application & selection guidance
Choose metal seating over resilient seating when medium temperature (up to 200 C here), abrasive solids or high cycling rules out EPDM/NBR seats; the page positions the execution for water, power, steel-smelting, chemical and papermaking pipelines. For higher temperature and tighter shutoff, the triple-offset executions are the next rung up.
Frequently asked questions
When does metal seating beat a resilient (soft) seat?
Above the elastomer temperature window - up to 200 C on this page - and in abrasive or high-cycle duty where soft seats erode; the eccentric design reduces seal friction so a metal-to-metal seal remains practical. The page states the T-type disc seal forms a linear sealing pair.
What sizes and pressures are covered?
DN100-DN1200 at PN10/PN16/PN24 to DIN3202 and DIN2501 PN10/PN16, with ductile-iron body and seal and a stainless steel stem.
How does this relate to double- and triple-offset valves?
The offset geometry - shaft behind the disc axis, offset from the pipe centreline, seat taper angled off the shaft - is what separates eccentric from concentric valves; adding the third taper offset gives the triple-offset execution. This page covers the general eccentric metal-seat execution; the dedicated double- and triple-offset pages carry those exact specifications.
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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