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API Duo Plate Check Valve
API Duo Plate Check Valve

API Duo Plate Check Valve


Design: API594

Face to Face: API594

Testing Standard: API 598.


Dual Plate Check Valve

A Double Plate Check Valve is a type of non-return valve that is designed to prevent backflow in pipelines. It is sometimes referred to as a Dual Plate Check Valve or Duo Check Valve.

The valve consists of two spring-loaded plates that are hinged on a central pin. When there is flow in the forward direction, the plates are pushed open, allowing fluid to pass through. When the flow decreases or stops, the plates are closed by torsion spring action, preventing reverse flow.

Compared to traditional swing check valves and lift check valves, Double Plate Check Valves are generally stronger, lighter in weight, and smaller in size. They also offer the benefits of no water hammer and non-slam simultaneously, making them an efficient and effective choice for many applications.

Double Plate Check Valves are commonly used in industries such as oil and gas, water treatment, chemical processing, and power generation. They are available in a variety of materials, sizes, and designs to suit different pipeline applications.


TypeDual plate check valve
FunctionUsed to prevent backflow in piping systems
Body materialCast iron, carbon steel, stainless steel, other alloys
Disc materialStainless steel, other alloys
Stem materialStainless steel, other alloys
Seat materialEPDM, NBR, Viton, PTFE, metal-to-metal
Size range1 inch to 60 inches
Pressure ratingANSI class 150 to 2500, PN 10 to PN 420, JIS 10K to JIS 63K
Temperature range-196°C to +815°C (-321°F to +1500°F)
End connectionsWafer, flanged
Face to FaceAccording to API 594 or DIN EN 558-1 standards
InstallationHorizontal or vertical
MaintenanceMinimal maintenance required
AdvantagesCompact design, low pressure drop, quick response, low cost
ApplicationsChemical, oil and gas, power generation, water treatment, etc.

API Cast Steel Duo Plate Check Valve

API Cast Steel Duo Plate Check Valve


Light Weight thus easier handling and self supporting.

Light-weight discs for fast closing without backflow 
Shock bumpers- extended cycle life of valve trim with minimal wear under the most severe services .

More compact & Structurally sound design.

Same valve can be installed horizontally or vertically.

Only Dual Plate Check Valve which can be installed for flow upside down due to spring assisted closure.

Low Pressure Drop and reduced Energy Loss irrespective of Pressure Ratings.

Lifting rings from DN 200

Please contact us for technical sheet and quotation !

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