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Flanged Butterfly Valve Installation Instructions and Installation Precautions
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Flanged butterfly valves act as key parts in industrial piping setups. These valves have a small and neat design. This allows good flow control and very little pressure loss when completely open. The disc turns on a central shaft. It gives fast quarter-turn action. Flanged connections let workers bolt them tightly between pipe flanges. They work well in situations that need strong seals and simple maintenance access.

Table of Contents [Hide]
1 Flanged Butterfly Valve Introduction
2 Types of Flanged Butterfly Valves
3 Flanged Butterfly Valve Installation Steps
Installation Precautions
5 Conclusion
6 FAQS
7 Partner with FLUIDO as Your Reliable Butterfly Valve Manufacturer and Supplier

Flanged Butterfly Valve Introduction

When open, the disc lines up with the pipe opening. This creates low resistance to flow and saves energy. When closed, the disc presses tightly against the seat for a good shut-off.

Main structural parts include:

  • Body with built-in flanges at both ends for straight bolting.
  • Eccentric disc-shaft setup (single, double, or triple offset) to cut down wear and torque.
  • Anti-blowout stem features for added safety.
  • Bi-directional ability in many versions, with zero leakage in resilient-seated types.

Types of Flanged Butterfly Valves

Flanged butterfly valves classify primarily by sealing mechanism, eccentric structure, and material compatibility.

Soft Seal Flanged Butterfly Valve

Soft seal versions use resilient materials for the seat.

Common seat materials include EPDM, NBR, Viton, and PTFE. These provide excellent bubble-tight shutoff.

Applications dominate in water treatment, HVAC, and food processing where tight sealing outweighs high-temperature needs.

Hard Seal Flanged Butterfly Valve

Hard seal designs employ metal-to-metal or metal-to-composite sealing.

Seating involves stainless steel, cobalt alloys, or multi-layer composites. These withstand higher temperatures and pressures.

Advantages include extended service life and compatibility with aggressive media like steam or hydrocarbons.

Sealing may not achieve zero leakage in all conditions, making them ideal for flow regulation rather than strict isolation.

These perform well in chemical plants, power stations, and high-temperature water systems.

Double Flange Type Butterfly Valve

Double flange (or double flanged) butterfly valves feature flanges on both sides for direct bolting.

This configuration enhances structural integrity in larger sizes (DN50 to DN1200 or more). Pressure ratings commonly include PN10/PN16 or Class 150/300.

Designs often incorporate single, double, or triple offset geometries to reduce torque and improve sealing.

U Flange Type Butterfly Valve

U flange types butterfly valve offer a single-sided flange or specialized U-shaped connection for compact installations.

These provide easier alignment in tight spaces while maintaining flanged security.

They share similar material options and standards as double flange models.

High Performance and Triple Offset Flanged Butterfly Valves

Triple offset models feature a conical sealing surface, achieving metal-to-metal contact with minimal wear.

Applications extend to demanding environments like petrochemical refining and offshore platforms.

3

Flanged Butterfly Valve Installation Steps

Follow these steps in order for a safe and good installation.

Place the valve between the two pipe flanges. Line up the bolt holes exactly. Keep the disc a bit open (about 5-10%) to stop seat harm during setup.

Put bolts and nuts through the flange holes. Tighten them by hand at first. This holds everything and lets you fix the flange position for even touch.

If the flanges need welding to the pipe, do spot welds first with the valve there for correct alignment. Then take the valve out carefully.

Finish full welding of flanges to the pipe after taking it out. Let the welds cool all the way. This stops heat bending or harm to close parts.

Put the valve back in after cooling. Make sure enough space exists around the disc. It must turn fully without hitting anything. The pipe needs to leave room for the disc to open all the way.

Center the valve properly. Tighten bolts slowly in a crisscross or star shape. This spreads pressure evenly. Do not tighten too much. That can bend the seat or raise operating torque.

Open and close the valve several times from full shut to full open. Check for smooth and clear movement. Change bolt torque if needed. Then check again.

Installation Precautions

Following these points lowers chances of leaks, early wear, or breakdown.

  1. Always keep the valve closed while installing. This guards the sealing surface from dirt.
  2. Clean the pipeline very well before adding the valve. Remove bits that could scratch the seat.
  3. Line up flanges straight in the center. Poor alignment leads to uneven force and possible leaks.
  4. Tighten bolts in a diagonal order with a torque wrench. Follow maker-suggested values to avoid crushing the seat.
  5. Never put in the valve with the disc wide open. Pipe edges can cause damage.
  6. Do not weld flanges while the valve stays in place. Heat can harm rubber or polymer seats.
  7. For bi-directional valves, check flow direction if shown. Most resilient-seated ones manage flow both ways.
  8. In dead-end setups, place the inlet side toward the pressure side. Think about adding support downstream.
  9. Test actuators after installation. Adjust travel stops for complete open and close spots.
  10. Keep valves dry and safe in storage. Avoid outside conditions that bring rust or hard seals.

Other good habits from industry rules include using matching gaskets only when needed (for example, with thermoplastic flanges). Also support bigger valves to cut stress on joints.

Conclusion

Correct installation of flanged butterfly valves brings the best flow control, tight sealing, and system dependability in many industrial fields.

For high-quality flanged butterfly valves, including U-type and double flange designs in ductile iron, stainless steel, and various seat materials compliant with API, DIN, and ANSI standards, FLUIDO stands out as a trusted manufacturer, supplier, and factory.

FAQS

Can flanged butterfly valves be installed in any orientation?
What seat materials suit different media?
Why avoid overtightening bolts during installation?
How to ensure proper alignment during installation?

Partner with FLUIDO as Your Reliable Butterfly Valve Manufacturer and Supplier

As a leading manufacturer, supplier, and factory of premium flanged butterfly valves, FLUIDO offers customizable solutions, competitive pricing, and certified quality (ISO9001, CE). Contact the team today for quotes, technical support, or bulk orders. Reach out via email at info@fluidovalve.com, phone at +86 13210153062, or the website contact form to discuss project requirements and secure dependable valve supply for industrial pipelines.