A double-flap check valve is a type of valve designed to allow fluids or gases to flow in only one direction. In this system, two flaps are positioned symmetrically and operate automatically to prevent backflow. When flow begins, the flaps open, and when the flow stops, they close automatically with the help of spring support, effectively blocking reverse flow.

Double-flap check valves are generally preferred for installation in horizontal pipelines. They are notable for their lightweight construction, low pressure drop, and compact design. Additionally, because the risk of water hammer is minimized in this type of valve, the connected system equipment is effectively protected from potential damage.

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Where Are Double Flap Check Valves Used?

They have a wide range of applications, making them an indispensable part of industrial systems. They are especially preferred in processes where backflow could pose a risk to system safety.

They are used in pump systems to prevent backpressure that may occur when the pump stops.
They are used in heating, ventilation, and air conditioning (HVAC) systems to control the flow.
In fire suppression systems, they prevent backflow of water, maintaining pressure balance.
In petroleum, gas, and chemical plants, the flow direction of fluids is controlled to protect other equipment in the system, such as valves and pumps.
In water treatment systems, backflow of water is prevented.

In this respect, double-disc check valves enhance system safety and support energy efficiency.

What Are the Technical Specifications?

Double-disc check valves are designed to enhance their structure, durability, and performance. Depending on the application, they can be manufactured using different material options.

Discs: Steel or bronze
Gasket: EPDM, NBR, or PTFE
Connection Type: Flanged or wafer type
Pressure Rating: PN10, PN16, ANSI 150
Operating Temperature: -10°C to +200°C
Installation Orientation: Horizontal or Vertical

Each product is put into service only after undergoing leak and backflow tests.

Why Are Double-Disc Check Valves Preferred?

In double-disc check valve systems, lower pressure loss is observed compared to conventional check valves, thereby improving system efficiency. Additionally, thanks to the spring-assisted mechanism, the discs close more quickly, reducing the risk of water hammer.

Thanks to its compact design, it can be easily installed in confined spaces, while maintenance requirements are kept to a minimum. All these advantages make double-disc check valves a popular choice for both new installations and upgrades to existing systems.