Flanged Butterfly Valves

Flanged Butterfly Valves are engineered for robust, leak-proof performance in systems where a secure and rigid connection is essential. Designed to bolt directly between flanged pipework, these valves provide reliable isolation and throttling control in a wide variety of industries—from water treatment and HVAC to chemical, marine, and power generation.With a full-face flange connection, these valves offer greater structural stability and reduced risk of leakage, making them especially suitable for high-pressure and high-flow systems. Flanged butterfly valves are available in a range of materials including ductile iron, carbon steel, and stainless steel, and can be fitted with EPDM, NBR, Viton, Silicone, or PTFE seats to match specific media requirements.

Key Features

Key features and benefits.
1

Key Features

Flanged butterfly valves provide a robust and stable connection between pipeline sections, reducing the risk of misalignment or leakage. The full-face contact ensures even pressure distribution and a reliable seal, even under fluctuating pressures.
2

Key Features

Designed for both on/off isolation and throttling, these valves offer excellent flow modulation across a wide range of applications. Their quarter-turn operation allows for fast and efficient flow adjustment with minimal effort.
3

Key Features

Manufactured in materials like ductile iron, stainless steel, and carbon steel, flanged butterfly valves withstand harsh media and external conditions. With a wide range of seat and disc combinations, they are suitable for everything from clean water to aggressive chemicals.

How to Install a Flanged Butterfly Valve

1. Prepare the Valve and Pipeline

Before installation, inspect the butterfly valve to ensure it is clean, undamaged, and that the disc is properly centered within the body. Check that the pipe flanges are clean, aligned, and free from any debris, rust, or surface irregularities that could affect sealing. Confirm the valve's compatibility with the intended media, pressure rating, and temperature range to avoid operational issues later.

2. Position and Align the Valve

Carefully place the valve between the flanges, keeping the disc slightly open (around 10 degrees) to prevent damage to the seat during installation. Use suitable gaskets if required. Insert the flange bolts and hand-tighten them in a cross-pattern to hold the valve in place. At this stage, do not fully tighten the bolts—ensure that the valve is centered and that the disc can rotate without interference from the pipe flanges or gaskets.

3. Tighten and Commission

Once correct alignment is confirmed, tighten the bolts in a diagonal or star pattern to the manufacturer’s recommended torque values. Avoid over-tightening, as this may damage the valve body or deform the seat. Operate the valve manually or with an actuator to check for smooth, full-range movement and proper sealing. Gradually introduce system pressure and inspect for any leaks during startup, monitoring the valve during initial operation to confirm stability.

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Frequently Asked Questions

What is a flanged butterfly valve?

A flanged butterfly valve is a quarter-turn valve that mounts between two pipe flanges using bolts. It provides reliable shutoff or throttling control in medium to large pipeline systems.

What sizes are flanged butterfly valves available in?

Flanged butterfly valves typically range from 2 inches to 24 inches and beyond. Larger sizes are common in industrial and waterworks applications due to their strength and secure mounting.

What materials are used for flanged butterfly valves?

Common materials include ductile iron, carbon steel, stainless steel, and aluminium bronze for the body, with various seat and disc options to suit the media and operating conditions.

Are flanged butterfly valves suitable for high-pressure systems?

Yes. Flanged butterfly valves are ideal for higher pressure applications, especially when compared to wafer types, thanks to their full-face bolted connection which provides greater mechanical strength.

Can flanged butterfly valves be used for throttling?

Absolutely. These valves are suitable for both on/off isolation and flow regulation, offering good throttling characteristics in process systems.

What flange standards are supported?

Most flanged butterfly valves support ANSI 150, PN10, PN16, and JIS flange standards. Always verify flange compatibility with your pipeline before installation.

Do I need gaskets for installation?

Gaskets are generally recommended for flanged butterfly valves to ensure a proper seal between the valve and pipe flanges. Seat design may also influence gasket requirements.

How do I install a flanged butterfly valve?
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Can these valves be automated?

Yes. Flanged butterfly valves are commonly used with pneumatic or electric actuators for automated flow control, and often feature an ISO 5211 mounting pad for direct actuator installation.

What seat materials are available?

Seat options include EPDM, NBR, Viton, Silicone, and PTFE, depending on temperature range, media compatibility, and application requirements.

Are flanged butterfly valves bi-directional?

Most standard flanged butterfly valves are bi-directional, meaning they can be installed with flow in either direction. Always confirm with the manufacturer for critical applications.

What industries commonly use flanged butterfly valves?

They are widely used across water and wastewater, HVAC, power generation, chemical processing, marine, and general industrial sectors due to their strength, reliability, and ease of maintenance.

FAQ

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Flanged Butterfly Valves