Check Valves Β· Swing Check Valves
Duplex Swing Check Valves
Duplex swing check valves pair the self-acting swing-disc non-return principle with duplex stainless steel bodies, the material execution chosen where chloride-bearing or corrosive media would pit a standard WCB or CF8M body. The benchmark page covers DN40 to DN600 in PN16 to PN63 and Class 150 to Class 300, with flanged, socket-weld and butt-weld ends and manual, electric or pneumatic operation, plus a full PN16 dimension table.
Part of the Swing Check Valves family
Last updated: 2026-11
Specifications
| size range | DN40 to DN600 |
|---|---|
| pressure class | PN16 to PN63, Class 150 to Class 300 |
| body materials | Duplex Stainless Steel, Super Duplex Stainless Steel, Alloy 20, CN7M, nickel-molybdenum alloy, Carbon Steel, WC6 |
| disc materials | Duplex Stainless Steel, Super Duplex Stainless Steel, Alloy 20, CN7M, nickel-molybdenum alloy |
| end connections | Flanged, Socketweld, Buttweld |
| operation | Handwheel Operated, Electric Actuated, Pneumatic Actuated |
| design standards | ANSI B16.34, API 6D, DIN 3840, BS EN 1868 |
| testing standards | API598, API6D, DIN3230, BS EN 12569 |
| trim materials | SS304, SS316, SS304L, SS316L, 13%Cr.Steel, cobalt-chromium hardfacing alloy, nickel-molybdenum alloy, Duplex Stainless Steel |
| gland packing | Graphite, PTFE |
| face to face standards | ANSI B16.10, API 6D, DIN3202, BS EN558-1 |
| flange standards | ANSI B16.5, DIN 2543, BS EN 1092-1 |
| buttweld end standards | ANSI B16.25 |
Application & selection guidance
Select the duplex execution by medium corrosivity and chloride level first, then by class rating and end connection against the piping standard. Disc, trim and gland-packing materials are separately selectable, so specify trim hardness against the media solids, not just the body grade.
Frequently asked questions
When is a duplex swing check valve the right choice over CF8M?
When the medium combines corrosion duty with mechanical strength requirements - duplex bodies resist chloride pitting far better than CF8M while keeping higher yield strength. The benchmark page lists duplex, super duplex, Alloy 20, CN7M, nickel-molybdenum alloy, carbon steel and WC6 body options, so the media analysis should drive the material pick.
What sizes and pressure classes does this execution cover?
Nominal size DN40 to DN600 and nominal pressure PN16 to PN63 (Class 150 to Class 300) on the collected page, with a full PN16 face-to-face and height dimension table from DN40 to DN600.
Which standards govern the design and testing?
Design and manufacture to ANSI B16.34, API 6D, DIN 3840 and BS EN 1868; face-to-face to ANSI B16.10, API 6D, DIN3202 and BS EN558-1; flanges to ANSI B16.5, DIN 2543 and BS EN 1092-1; testing to API 598, API 6D, DIN 3230 and BS EN 12569.
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.
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