Check Valves Β· Dual Plate Check Valves
Dual Plate Lug Check Valves
Dual plate lug check valves are the lug-body execution of the dual plate principle: two spring-assisted half discs close with short travel for low slam, while the lugged body bolts between flanges and holds in the line even with one side removed, which the wafer execution cannot do. The benchmark page declares DN50 to DN900 at Class 150 to Class 2500, API 594 face-to-face, and testing to API 598.
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 |
| 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 lug execution where the valve must stay bolted in the line for upstream isolation or maintenance - pump discharges, service tee-offs and dead-end lines - and the wafer clamp is not acceptable. Size inside DN50 to DN900 against the line class up to Class 2500, pick the seat compound (EPDM, NBR, VITON elastomers or CF8/CF8M metal) for the medium and temperature, and match the face-to-face to API 594.
Frequently asked questions
Lug vs wafer dual plate check valve - when is the lug body required?
Both executions share the same fast-closing dual plate principle. The lug body adds threaded bolt bosses, so the valve can hold in the line with one flange dropped for work on the other side - required at pump discharges and dead-end service. The benchmark page keeps the same DN50 to DN900 and Class 150 to Class 2500 envelope as the wafer execution, with API 594 face-to-face.
Which seat compound should I choose?
The benchmark page lists EPDM, NBR and VITON elastomer seats alongside CF8 and CF8M metal seats. EPDM suits water and neutral media, NBR covers oils, VITON widens the temperature and chemical window, and the metal options take hot or abrasive duty. Confirm the medium and temperature before fixing the compound.
What information is needed to quote a dual plate lug check valve?
Nominal size within DN50 to DN900, pressure class up to Class 2500, body material preference (cast iron, ductile iron, cast steel, stainless steel or aluminium bronze), seat compound, and the mating flange standard. Those points define the execution for a quotation-ready inquiry.
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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