Butterfly Valves Β· Wafer Butterfly Valves
SS316L Wafer Butterfly Valves
SS316L wafer butterfly valves are the low-carbon stainless execution of the wafer pattern: the valve clamps between flanges, giving a compact, light isolating and throttling valve for large diameters. The collected benchmark page covers DN50 to DN2000 at PN10 to PN40 and Class 150, with SS316L among body options, a broad disc material list from aluminium bronze to SS316, elastomer or PTFE seat linings, and lever, gear, electric or pneumatic operation to API 609.
Part of the Wafer Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN2000 |
|---|---|
| pressure class | PN10 to PN40, Class 150 |
| seat materials | EPDM, NBR, Viton, PTFE |
| disc materials | Aluminium Bronze, Carbon Steel, Cast Iron, Ductile Iron, SS304, SS316 |
| stem materials | SS410, SS420, SS416, SS304, SS316, nickel-copper alloy |
| body materials | SS316L, Carbon Steel, Cast Iron, Ductile Iron |
| end connections | Wafer |
| operation | Lever Operated, Gear Operated, Electric Actuated, Pneumatic Actuated |
| design standards | API 609 |
| testing standards | API 598 |
| face to face | API 609, MSS SP-67, MSS SP-68, BS EN1092 |
| packing materials | Graphite, PTFE |
| flange standards | ASME B16.5, DIN 2501 |
Application & selection guidance
Wafer pattern suits sandwich installation between standard flanges where lug or double-flanged bodies are not required (no dead-end service, no downstream piping disassembly under load). DN50 to DN2000 makes it a large-diameter workhorse; seat lining selection (EPDM, NBR, Viton, PTFE) follows the medium and temperature. Low-carbon SS316L body option is for welded installation where sensitization matters. Disc material is matched to the medium against the body β the benchmark lists six disc grades for exactly this reason.
Frequently asked questions
Wafer vs lug butterfly valve β which pattern do I need?
A wafer body is clamped between two flanges and is the lighter, cheaper pattern, but it cannot act as a line-stop: remove downstream flange bolts and the line loses its valve. A lug body has threaded lugs so each side can be disconnected independently β that is the pattern for dead-end service or maintenance isolation. Both share the same benchmark seat and operation options in SS316L execution; pick by installation need, not by price alone.
Which seat lining material should I choose?
The benchmark page lists EPDM, NBR, Viton and PTFE linings. EPDM is the default for water and steam-condensate service, NBR covers oils and hydrocarbons, Viton extends temperature and chemical resistance for aggressive media, and PTFE gives the widest chemical envelope at the cost of higher seating torque. Match the lining to the medium and temperature, and confirm the pairing at quotation β the wrong lining, not the body, is the usual failure point.
What information is needed to quote an SS316L wafer butterfly valve?
Provide nominal diameter (DN50 to DN2000), pressure rating (PN10 to PN40 or Class 150), body and disc material preference, seat lining against the medium, operation (lever, gear, electric or pneumatic), and the flange standard the valve will be clamped between. For actuated versions add the actuation supply and any fail-safe requirement.
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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