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Double Flange VS Single Flange Butterfly Valves

Time: 16-January 2025 | Source: I-FLOW| Share

At first glance, double flange and single flange butterfly valves may look similar—but their installation and usage tell a very different story.

Double Flange Butterfly Valve: Built for Strength

A double flange butterfly valve bolts directly to pipe flanges on both sides. This creates a strong, stable connection that’s ideal for large pipes and heavy-duty systems.

Why choose it?

  • Excellent pipe alignment

  • High structural strength

  • Reliable performance in large systems


Single Flange Butterfly Valve: Designed for Flexibility

Single flange (lug-type) butterfly valves use threaded lugs instead of full flanges. This design makes maintenance easier, especially when you need to isolate part of a pipeline without shutting down the entire system.

Why choose it?

  • Allows end-of-line service

  • Saves space and installation time

  • Ideal for HVAC and fire protection systems


Which One Should You Choose

If your system involves large pipe sizes and high mechanical stress, a double flange butterfly valve is the safer choice.
If easy maintenance and compact installation matter more, a single flange butterfly valve offers greater flexibility.

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