Les vannes papillon sont un type courant de vanne utilisé dans une variété d'applications et de processus industriels. Ils présentent une conception simple mais efficace qui permet une opération d'ouverture-fermeture facile et un excellent contrôle du débit. This blog post will cover the key things to know about butterfly valves, y compris:
• What is a butterfly valve and how does it work?
• Different types of butterfly valves
• Common applications
• Key features to consider when purchasing
• Tips for proper installation and usage
What is a Butterfly Valve?
A butterfly valve consists of a circular disc (known as the “disque” or “papillon”) that rotates within the valve body to either allow fluid to pass or block flow. As the disc turns, it moves from a parallel position (fully open) to a perpendicular position (fully closed).
This creates a very simple and versatile valve suitable for a wide range of applications. Some key advantages of butterfly valves include:
• Simple and robust design
• Low maintenance
• Wide selection of sizes and pressure ratings
• Compact size
• Relatively inexpensive
• Easy open-close operation
Types Of Butterfly Valves
There are several common types of butterfly valves based on installation, connection types and material composition:
• Lug type – Features mounting lugs on the valve body for attachment to mating flanges or brackets.
• Wafer type – Sit between two mating flanges and do not have their own end connections.
• Double flange butterfly valve – Have a flange connection on both sides to install in-line between pipe sections.
• Single flanged – Have a flange connection on one side and another end connection type on the other side.
• Grooved end – Utilize grooved connections rather than flanges for installation.
• Resilient seated – Have an elastomer seal attached to the disc edge for a better shut-off.
• High-performance – Feature a metal-to-metal or balanced stem seal design for maximum efficiency.
• LT butterfly valves – are designed to operate in lower temperature applications.
Common Applications For Butterfly Valves
Some of the most common applications for butterfly valves include:
• Water and wastewater transmission – Large diameter butterfly valves are often utilized in water pipes and mains.
• Centrales électriques – Used in circulating water, condenser water and steam systems.
• Oil and gas pipelines – Double-flanged valves are ideal for in-line installation in pipelines.
• Pulp and paper processing – Found in digesters, stock lines, white and black liquor systems.
• Applications marines – Saltwater-resistant valves withstand conditions on boats and ships.
• Chemical processing – Chemical-compatible valves are utilized throughout chemical plants.
• HVAC systems – Butterfly valves regulate air and water flow in commercial and industrial HVAC.
Key Features To Consider
When purchasing butterfly valves, be sure to confirm the following:
• Pressure rating – Suitable for the maximum pressure of your system or process. Higher ratings mean wider safety margins.
• Temperature rating – Rated for the full temperature range of your application. Most standard butterfly valves operate from -100°F to 300°F.
• Disc material – Common options include stainless steel, aluminum-bronze, fonte ductile, etc.. Choose based on your media compatibility needs.
• Seat material – Caoutchouc, Teflon, and other elastomers provide resistant sealing for different fluids.
• Actuator – Électrique, pneumatic or manual depending on your preferred open-close mechanism.
• Connection type – Flanges, threads or grooves that match your existing pipes.
• GGG50 butterfly valve – If replacing an existing butterfly valve, ensure the new one has the same dimensions.
• Certification – Valves certified for particular industries have passed stringent safety and performance testing.
Proper Installation And Usage
Some tips for working with butterfly valves:
• Ensure proper alignment of the valve within the pipeline to avoid stresses on valve body.
• Lubricate the stem, bearings and seating surfaces according to manufacturer’s guidelines.
• Gradually open and close the valve to allow the fluid to pass smoothly and avoid pressure spikes.
• Exercise the valve periodically if it remains inactive for long periods. This keeps seals and O-rings from sticking.
• Clear debris from valve and actuator before operation.
• Remplacer les joints, gaskets, bearings and O-rings regularly according to maintenance schedule.