Butterfly Valves Β· Wafer Butterfly Valves
Duplex Wafer Butterfly Valves
A wafer-body butterfly valve on the duplex material axis: Duplex 4A/5A and super-duplex body options with SS316 shaft and stem, elastomer seats (EPDM/NBR/Viton) and a DN50-DN200 envelope at Class 150-600 / PN10-40. It is the compact corrosive-media isolation pick where the piping specification has already moved to duplex fittings.
Part of the Wafer Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN200 |
|---|---|
| pressure class | Class 150 to Class 600, PN10 to PN40 |
| seat materials | EPDM, NBR, Viton |
| disc materials | Stainless Steel, Duplex Stainless Steel, nickel-molybdenum alloy, Titanium |
| body materials | Duplex 4A, 5A, Duplex Stainless Steel, Super Duplex Stainless Steel, nickel-molybdenum alloy, Alloy Steel, nickel-copper alloy, nickel-chromium alloy, iron-nickel-chromium alloy, Titanium, Bronze |
| end connections | Wafer |
| operation | Manual, Lever Operated, Electric Actuated, Pneumatic Actuated |
| stem material | SS316 |
| shaft material | SS316 |
| packing seal | Graphite, PTFE |
| face to face standards | ANSI B16.10, API 609, MSS-SP-68, ISO 5752 |
| flange standards | ASME B16.5: Class 150 to Class 2500, JIS: 10K to 20K, DIN: PN10 to PN40 |
Application & selection guidance
Use this execution when the line material is duplex and a wafer sandwich body keeps weight and face-to-face down. Seat elastomer follows the medium (EPDM, NBR or Viton per the page); wafer ends mean both pipe sides clamp the body, so the flange ratings to ASME B16.5 / JIS / DIN on the page must match the mating flanges.
Frequently asked questions
Why duplex material for a wafer butterfly valve?
Wafer bodies sit inside the pipeline and see the medium continuously; in seawater, brine and chloride-bearing chemical duty a duplex 4A/5A or super-duplex body resists the pitting that attacks ductile iron and standard CF8M. The page also lists nickel-molybdenum alloy, nickel-copper alloy, nickel-chromium alloy, iron-nickel-chromium alloy, titanium and bronze body options.
What sizes and pressure classes does the page cover?
DN50 to DN200 at Class 150 to Class 600 (PN10 to PN40), wafer end connection, manual/lever/electric/pneumatic operation, with a full DN50-DN200 wafer dimension table.
Which seat should I pick?
EPDM, NBR or Viton per the specification block - EPDM for water duty, NBR for oils, Viton for chemicals and higher temperature. The page lists all three as options on the same body; confirm the exact seat-versus-temperature pairing at quotation.
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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