Dual Plate Check Valve

About Dual Plate Check Valves

A check valve is used to automatically open when media flows and then close when fluids flow backward. A check valve is also referred to as a one-way valve, a non-return valve, or a clack valve. Check valves have the ability to pass fluid in a single direction. Safety applications rely on this feature along with the capability to prevent overflow.

The “slamming effect” is characteristic of check valves caused by a sudden stoppage of the pump that causes forward-moving fluid to flow backward rapidly. As the media flows backward, it becomes blocked as it makes contact with the check valve that needs to close. It is called a “slamming effect” because of the noise it makes.

Compared to other check valves, two types of valves close rapidly or slowly: dual plate check valves or swing check valves. Because of its low slamming effect, the dual plate type of check valves is more widely used in certain regions since they have a low slamming effect.

• With the halting of fluid reversal, check valves protect mechanical components in a piping system.
• Should a pipe break, a dual plate control valve prevents a major backflow. This mechanism also reduces energy consumption wastes by preventing backflow to a lower pressure.
• Wafer-type valves have excellent hydrodynamic properties.
• Being lighter in weight benefits installation, transport, and storage.
• Dual plate check valves are suitable for liquid, gas, and steam operations as with heating, air conditioning, and cooling systems.
• They are sometimes found in steam and condensate system applications such as water supply, or pipes for oil and natural gas.

Dual Plate Check Valve Specifications 

The dual check valve is one of many check valve types. When selecting a check valve for process flow control, it’s important to familiarize yourself with the specifications. This helps ensure you get the right one for the application.

• Size : 40mm-1200mm(1.5”~48”)
• Pressure testing as according to ISO 5208:
  • Seat testing : 11bar (160psi.)
  • Body testing : 15bar (220psi.)
• ANSI CLASS 150LB/ PN10
• End connections:
  • BS 10 TABLE “E”. ANSI 150LB, ISO-PN. JIS 10K
• Model No. CV-123A (wafer type)
  • Size: 1.5″-60″ (40mm-1500mm)
  • End Facing FF/RF/RTJ
• Model No. CV-123B (lugged type)
  • Size: 1.5″-36″ (40mm-900mm)
  • End Facing FF/RF
• Model No. CV-123C (flanged type)
  • Size: 1.5″-36″ (40mm-900mm)
  • End Facing FF/RF
• Pressure Rating
  • CL 125, CL 150, CL 300, CL 600
  • PN10, PN16, PN20, PN25, PN40, PN50
  • 5K, 10K, 20K
• Thickness: API 594, Maker Standard.
• Design: API 594, Maker Standard.
• Face to Face: API 594, API 6D, ISO 5752, EN 558-1
• Marking: MSS-SP 44
• Flanged Face Standard: MSS-SP 6, ASME B16.1, ASME B16.5, ISO 468
• Inspection Standard: API 598, ISO 5208.

Flow Behavior in Dynamic Piping Systems

Dual plate check valves support stable flow behavior in piping systems that experience changing velocities, pressure variations, or intermittent pump operation. Their spring-assisted disc movement helps maintain predictable closure timing, reducing the likelihood of sudden reversal or uncontrolled backflow. This behavior supports dynamic flow control in applications where pumps cycle frequently or where flow direction changes as part of normal operation. Consistent movement also helps maintain system balance by reducing hydraulic shock and supporting smoother transitions between flow states.

Disc Interaction and Closure Stability

The dual plate design relies on coordinated disc movement to support controlled closure. Balanced spring tension and guided disc travel help maintain alignment during operation, reducing wear and supporting long service intervals. This interaction supports controlled check valve closure in systems where rapid flow changes can influence valve behavior. Stable disc movement also helps maintain sealing performance across varied pressure ranges, supporting reliable operation in liquid, gas, and steam applications.

Hydrodynamic Efficiency in Process Applications

Hydrodynamic efficiency is important in systems where flow resistance influences overall performance. Dual plate check valves support efficient flow by minimizing obstruction and reducing turbulence as media passes through the valve body. This efficiency supports process flow optimization in heating, cooling, and industrial systems where energy use and pressure stability are important. Reduced resistance also supports smoother operation in pipelines that handle continuous or high-volume flow.

System Compatibility Factors

Facilities evaluating dual plate check valve compatibility often consider:

• Pressure class alignment
• End connection requirements
• Media type and flow characteristics
• Installation orientation

These factors help ensure the valve matches the piping system, flow conditions, and environmental requirements present in the application. Proper compatibility supports stable movement, predictable closure behavior, and long-term reliability.

Performance Behavior in High-Demand Systems

High-demand systems require check valves that maintain stable operation across extended service intervals. Dual plate designs support dependable performance through controlled disc movement, balanced spring tension, and efficient flow characteristics. This behavior helps maintain system protection in high-demand piping applications where flow reversal, pressure changes, or pump cycling influence overall performance. Stable operation also supports reduced maintenance requirements and predictable long-term behavior.

FAQs

How Does Disc Movement Influence Check Valve Performance?

Disc movement influences closure timing, sealing behavior, and overall flow stability. Balanced disc travel supports predictable operation across varied flow conditions.

What Factors Affect Hydrodynamic Efficiency in Dual Plate Check Valves?

Body geometry, disc profile, and internal flow path influence hydrodynamic efficiency. Reduced turbulence supports smoother flow and lower energy use.

Can Dual Plate Check Valves Be Installed in Different Orientations?

Yes. Many dual plate designs support vertical or horizontal installation, depending on the model and flow requirements.

Why Is Rapid Closure Important in Flow Reversal Conditions?

Rapid closure helps prevent backflow, hydraulic shock, and mechanical strain on connected components. Stable closure behavior supports reliable system protection.

Get more information here about the dual plate check valves (CV-122 and CV-123 series)