API · ASME · DIN · EN standard industrial valves
Dual Plate Check Valves
Dual plate check valves carry two spring-loaded semicircular plates on a centre hinge, so the plates close over a short travel while flow is still decelerating — the usual answer where slam and water hammer must stay low in a compact wafer body. The range covers a wafer series at DN50 to DN900, Class 150 to Class 2500, with ductile iron, stainless and aluminium bronze discs, stainless spring and stem, and elastomer-to-stainless seats (EPDM, NBR, Viton, CF8, CF8M). Face-to-face follows API 594 / ASME B16.10 and testing runs to API 598. Selection turns on the wafer length against the mating flanges, seat material versus temperature and medium, and the spring characteristic against the expected reversal.
Part of the Check Valves family
Last updated: 2026-11
Family 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 |
| end connections | Wafer |
| operation | Self-acting (automatic) |
| temperature range | -196°C to 570°C |
| design standards | API 594 |
| testing standards | API 598 |
| face to face | API 594, ASME B16.10 |
| spring material | Stainless Steel |
| kDp product name | API 594 Dual Plate Check Valve |
| kDp type | Wafer Check Valve |
| kDp design standard | API 594 |
| kDp body material | ASTM A351 CF8M |
| kDp example size | 4 Inch, DN100 |
| kDp example pressure | Class 150 LB, PN20 |
| kDp end connection | Wafer Ends |
| kDp size range | NPS 2–60 Inch (DN50–DN1500) |
| kDp temperature range | -29°C to 595°C |
| kDp pressure range | Class 150–2500 (PN10–PN420) |
| kDp material options | ASTM A216 WCB, WCC, A217 WC6, WC9, C5, C12A, A352 LCB, LCC, A351 CF8, CF8M, CF3M, CF8C |
| kDp end connections | Wafer, Lug, Clamp, Flanged |
| kDp design manufacture standards | API 594, API 6D, JB/T 8937 |
| kDp face to face | API 594, API 6D, JB/T 8937, DIN 3202 |
| kDp flange standards | ANSI B16.5, DIN 2543–48, JB/T 9112–24 |
| kDp butt weld standard | ANSI B16.25 |
| kDp testing standards | API 598, DIN 3230, JB/T 9092 |
| kDp service media | Water, gas, oil, etc. |
| kDp disc open angle | Discs open 85° to ensure a low pressure drop |
| kDp sealing design | Zero Leakage Sealing Design with Soft Seated |
| kDp non slam design | Non Slam Design |
| kDp bubble tight | Bubble Tight Closed Off |
| kDp structure | unique center vertical pin shaft design |
| wDp example size | 6 Inch |
| wDp example pressure | Class 150 |
| wDp body bonnet material | ASTM A216 WCB |
| wDp end connection | Wafer |
| wDp design standard | ASME B16.34 |
| wDp face to face | ASME B16.10 |
| wDp testing standard | API 598 |
| lDp design standard | API 594 |
| lDp body material | ASTM A890 4A |
| lDp disc material | ASTM A890 4A |
| lDp spring material | nickel-chromium alloy X-750 |
| lDp example pressure | 150# |
| lDp example size | 30 Inch |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
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, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What standards govern the design and testing of dual plate check valves?
The published specification for this family lists API 594 as the design standards. Testing follows API 598.
What sizes and pressure ratings are available for dual plate check valves?
The published size range is DN50 to DN900, and the published pressure ratings are Class 150 to Class 2500. Availability of a specific size and rating is confirmed at quotation.
What materials are dual plate check valves available in?
The published specification lists body materials: Cast Iron, Ductile Iron, Cast Steel, Stainless Steel, Aluminium Bronze. Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do dual plate check valves cover?
The published working temperature range is -196°C to 570°C. For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What end connections do dual plate check valves support?
The published specification lists Wafer as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for dual plate check valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
Models & executions in this subtype
Model
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 clo
View specifications →Model
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 t
View specifications →Model
Rubber Lined Dual Plate Check Valves
Rubber lined dual plate check valves are the elastomer-sealed execution of the dual plate principle: two spring-assisted half plates close on an EPDM sealing su
View specifications →Model
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 sh
View specifications →Request a quote for dual plate check valves
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