Check Valves · Dual Plate Check Valves
Dual Plate Wafer Check Valves
Dual plate wafer check valves are the compact, wafer-clamped execution of the dual plate principle: two spring-closed half discs swing on a centre hinge and close with short travel, so the valve checks fast with low slam tendency while taking up almost no face-to-face length. The benchmark page declares DN50 to DN900 at Class 150 to Class 2500, cast iron through stainless and aluminium bronze bodies, stainless spring and stem, and elastomer or metal seat compounds (EPDM, NBR, VITON, CF8, CF8M).
Part of the Dual Plate Check Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN900 |
|---|---|
| pressure class | Class 150 to Class 2500 |
| body materials | Cast Iron, Ductile Iron, Cast Steel, Stainless Steel, Aluminium Bronze |
| disc materials | Ductile Iron, Stainless Steel, Aluminium Bronze |
| seat materials | EPDM, NBR, VITON, CF8, CF8M |
| temperature range | -40°C to +230°C |
| testing standards | API 598 |
| face to face | API 594, ASME B16.10 |
| spring materials | Stainless Steel |
| stem materials | Stainless Steel |
| flange standards | ASME B16.10 |
Application & selection guidance
Select the wafer execution where line length and weight matter - pump discharges and retrofits between existing flanges - and the dual plate closes fast enough to limit surge without a dedicated non slam device. Size inside DN50 to DN900 against the line class up to Class 2500, pick the seat compound for the medium and temperature (elastomers for water and general duty; confirm metal-seated options for hot or abrasive service), and match the face-to-face to API 594 so the clamp length fits the mating flanges.
Frequently asked questions
Dual plate wafer check vs conventional swing check - when does the wafer execution win?
The wafer body clamps between flanges with a very short face-to-face (API 594), cutting weight and space, and the twin spring-assisted plates close with short travel so slam and surge are reduced. Conventional swing checks remain simpler and cheaper where space is not constrained. Choose by the space, weight and surge limits of the installation rather than by habit.
Which seat compound should I pick?
The benchmark page lists EPDM, NBR and VITON elastomer seats alongside CF8 and CF8M metal seat options. EPDM suits water and most neutral media, NBR covers oils, VITON extends the temperature and chemical window, and the metal options take hot or abrasive service. Confirm the medium and temperature before fixing the compound.
What information is needed to quote a dual plate wafer check valve?
Nominal size within DN50 to DN900, pressure class up to Class 2500, body preference from the declared range (cast iron, ductile iron, cast steel, stainless steel, aluminium bronze), seat compound, and the mating flange standard. Those points define the execution and clamp length for a quotation-ready inquiry.
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.
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