Check Valves Β· Dual Plate Check Valves
Butterfly Type Check Valves
Butterfly type check valves are the compact wafer dual-plate execution: two half-disc plates snap shut across the flow path, giving non-return duty in a body short enough to sandwich between flanges. The benchmark execution spans 2 to 24 inch (DN50 to DN600) at PN10/16 and Class 125, with body options in A105, 304 and 316, stainless steel seal and stainless 304 stem, rated -20 to 200 C for water, waste water and oil.
Part of the Dual Plate Check Valves family
Last updated: 2026-11
Specifications
| size range | 2 to 24 inch (DN50 to DN600) |
|---|---|
| pressure class | PN10/16, Class 125 |
| body materials | A105, 304, 316 |
| temperature range | -20 to 200 C |
| design standards | DIN 2501 PN6/10/16, BS 5155 |
| seal materials | Stainless Steel |
| stem materials | Stainless Steel 304 |
| medium | Water, Waste Water, Oil |
Application & selection guidance
Choose the butterfly-type form where face-to-face length and weight matter - wafer dual-plate bodies fit between standard flanges with no extra room. Pick the body material (A105 for hydrocarbon service, 304 or 316 where corrosion resistance governs) against the medium, set PN10/16 or Class 125 to the line rating, and confirm the -20 to 200 C window.
Frequently asked questions
Is a butterfly type check valve the same as a butterfly valve?
No - only the disc motion is similar. A butterfly type check valve is a non-return device: its plates are closed by springs and opened by flow, and the body is wafer-short for sandwich mounting. The benchmark execution covers 2 to 24 inch at PN10/16 and Class 125.
Which body material should I pick?
The benchmark page lists A105, 304 and 316 bodies. A105 forged carbon steel suits hydrocarbon and higher-pressure duty; 304 and 316 stainless serve corrosive water duties. Match the choice to the medium and temperature within the -20 to 200 C range.
What information is needed to quote one?
Nominal size within 2 to 24 inch (DN50 to DN600), line rating (PN10/16 or Class 125), body material preference and the medium. Those four points fix the wafer execution in one pass.
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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