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Choosing The Right Butterfly Valve

Time: 23-June 2025 | Source: I-FLOW| Share

What Is a Butterfly Valve, and Why Use It
A butterfly valve is a type of quarter-turn valve that uses a rotating disc to regulate flow. Unlike gate or globe valves, it takes up very little space and opens/closes quickly. It’s ideal for large-diameter systems, tight spaces, or where cost and efficiency matter.
You’ll find butterfly valves in everything from HVAC systems and chemical lines to marine and wastewater pipelines.
What Are the Main Types of Butterfly Valves
Concentric (Rubber-Lined): Best for general-purpose use like water, air, or HVAC systems.
Double Offset (High-Performance): Great for moderate pressure/temperature systems such as chemical or food processing.
Triple Offset: Built for high-pressure, high-temperature environments—used in oil, gas, or steam pipelines.
Still not sure? Think about pressure, temperature, and media. These three will help narrow your choices quickly.
Wafer VS Lug: Which Body Style Is Better?
Wafer Butterfly Valve: Slim, economical, and ideal if you're installing between two flanges. Good for systems where you don’t need to isolate one side.
Lug Butterfly Valve: Has threaded bolt holes for bolting directly to flanges—perfect for dead-end service or systems that need one-side disconnection.
If cost is a concern and you don’t need isolation, go wafer. If you're after versatility and better pipeline access, go lug.

What Material Should I Choose
Media TypeSuggested Material
Clean waterCast iron + EPDM seat
Corrosive fluidsStainless steel + PTFE
SeawaterBronze or Duplex Stainless
Steam or OilMetal-seated triple offset
The disc, body, and seat material should all match your working fluid.
Manual or Automated
Use a manual lever or gear operator for simple or small-size installations.
Choose electric or pneumatic actuators for automation, remote control, or integration into process control systems.
Actuated valves are more expensive, but they bring efficiency and safety to large systems or hazardous media.
Any Tips for Sizing the Valve
Consider the flow rate and pressure drop across the valve.
If the valve is for throttling (partially open), look into double offset or triple offset designs for better performance and reduced wear.
Oversized valves can lead to poor control. Undersized valves can restrict flow. Always ask your valve supplier to help with CV calculation if needed.

When Should I Use a Butterfly Valve
①You need a compact, lightweight valve.
②You want quick shut-off and low torque operation.
③You’re handling large volumes at moderate pressure.
④You’re working within a budget and need a cost-effective solution.
They’re not ideal for very high-pressure or tight throttling at low openings. In those cases, a globe valve or triple offset butterfly may serve you better.
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