Butterfly check valves, also known as dual plate check valves , form a special group among non-return or check valves. These devices stop backflow in piping systems. They let fluid travel in just one direction and block any reverse movement on their own. The name "butterfly" comes from the valve's unique look. It has two half-circle plates or discs attached to a central hinge inside the valve body.

What are Butterfly Check Valves

Butterfly check valves have two half-circle plates fixed on a central hinge inside the pipeline. When fluid flows forward, pressure pushes the plates apart. They swing open and allow free passage. When flow stops or turns backward, the plates shut. Gravity, reverse pressure, or springs in some models help close them. This seals the line and stops backflow. The whole process works automatically using fluid forces alone. No outside power or hand operation is needed.

This setup creates a small structure with a very short face-to-face length. It sets the valve apart from usual swing check valves. Butterfly check valves usually give low pressure drop when open. They also react fast to flow shifts. These features make them useful in many situations.

Purpose and Role

Prevent Backflow

Protect Equipment

Enhance Safety & Purity

Industry Applications

Butterfly check valves work well in many different fields because they are dependable and flexible.

· Water and wastewater treatment plants use them in pumping stations. They stop treated water from flowing back into earlier steps.

· Power generation plants, even those dealing with steam in thermal and nuclear setups, count on them for proper flow direction.

· Chemical processing relies on butterfly check valves. They help keep reactions stable and avoid risky mixing.

· HVAC systems include them to make sure air and coolants move the right way.

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Advantages of Using Butterfly Check Valves

· The small dual-plate build gives shorter installation lengths than many other options. It fits well in tight spaces.

· Low pressure drop when open boosts energy savings in the system.

· Fast closing after flow reversal cuts down water hammer problems.

· Strong build with tough materials handles hard conditions. It needs very little upkeep.

Comparison with Other Types of Non-Return Valves

Butterfly check valves stand out for their small size and low pressure drop. This beats swing check valves, which have one swinging disc and medium-to-high pressure loss.

Lift check valves use a piston or ball that flow lifts up. They give medium pressure drop but close more slowly.

Ball check valves perform at a medium level in most ways. Yet they miss the fast response found in dual-plate types.

Butterfly check valves often win in fast response to reversal, low upkeep, and good value for many uses.

Important Factors to Consider When Choosing Butterfly Check Valves for Various Applications

· Fluid traits like type, temperature, corrosion level, and roughness decide the best materials. This choice helps the valve last longer.

· Pressure and temperature ranges in operation affect choices for body and seat materials. They make sure the valve stays strong.

· How tight the seal must be changes with the job. Resilient seats give steady sealing.

· Limited installation space points toward the small design of butterfly check valves.

· Flow details, such as speed, likely reversals, and allowed pressure drop, help pick the right model.

· Following industry standards and local rules makes sure the valve fits properly.

· Upkeep demands and full cost over time, including buying and servicing, play a role in choices.

· Buying from trusted manufacturers ensures steady quality and performance.

FAQ

Can butterfly check valves handle both liquids and gases?

Yes, their versatile design accommodates liquids, gases, and certain semi-liquids, depending on material selection and pressure ratings.

How do butterfly check valves reduce pressure drop?

The dual plates open fully parallel to flow, minimizing obstruction compared to single-disc or piston designs.

Are springs always present in butterfly check valves?

Not always; some rely on gravity and reverse pressure, while others include springs for faster or assisted closure in low-pressure or vertical installations.

Partner with FLUIDO for Your Valve Needs

As a professional manufacturer, supplier, and factory specializing in high-quality check valves, including dual plate and wafer types, FLUIDO offers reliable, certified solutions for industrial fluid control. Contact the team at info@fluidovalve.com to discuss specifications, request quotes, or explore OEM customization for projects requiring durable, efficient butterfly check valves. Reach out today to secure trusted supply and expert support for piping system requirements.