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Flanged Butterfly Valve Manufacturer
Flanged butterfly valve is a valve used to control the flow of fluid in a pipeline by rotating a disc (called a “butterfly”) to adjust the flow of fluid. It has flanges on both ends, allowing you to bolt the valve between two flanged pipe ends. Flanged butterfly valves are used in medium to high-pressure applications and are great for large flow systems.
Flanged butterfly valve works on a quarter-turn motion. When you turn the valve stem, the disc (butterfly) rotates around its axis to adjust the flow of fluid through the pipe. When the disc is parallel to the pipe, the valve is open, and fluid can flow through. When the disc is perpendicular to the pipe, the valve is closed, and the flow of fluid is stopped.
Open: Turn the valve stem, and the disc rotates to be parallel to the pipe, allowing fluid to flow.
Close: Turn the valve stem, and the disc rotates to be perpendicular to the pipe, stopping the flow of fluid.
Flanged butterfly valves can be operated manually, pneumatically, or electrically, depending on the application.
As a professional china butterfly valve manufacturer, judberd can manufacture concentric flanged butterfly valve, double eccentric butterfly valve, photos are as below
Flanged butterfly valve
Design conform to EN593
Concentric type
U type and normal length according to EN558-1
Material ductile iron
Disc ductile iron or steel
Sealing resilient seated
Operation lever, worm gear, Electric actuator, pneumatic actuator
Flanged butterfly valve
Design conform to EN593
Eccentric type
Series 14 is long structure ,series 13 is short structure
Material ductile iron
Disc ductile iron or steel
Sealing resilient seated
Operation lever, worm gear, Electric actuator, pneumatic actuator
Flanged butterfly valve advantage and application
Compared to a Wafer Butterfly Valve:
Connection: Flanged butterfly valves have flanges on both ends that allow you to bolt them directly between the flanges of the pipe. Wafer butterfly valves are sandwiched between the pipe flanges and don’t require additional flanges.
Application: Flanged butterfly valves are used in larger pipe systems and high-pressure applications to provide a more secure and leak-proof installation. Wafer valves are used in medium to low-pressure applications where ease of installation and cost are more important.
Compared to a Lug Butterfly Valve:
Connection: Lug butterfly valves have threaded holes on both ends, which allows you to install them between pipe sections without needing flanges on both sides, making maintenance easier. Flanged butterfly valves require flanges on both ends, providing a more robust, permanent installation.
Application: Lug valves are better for systems where you need to remove one side for maintenance without affecting the rest of the pipeline. Flanged butterfly valves are used for more secure, high-performance applications.
Compared to a Ball Valve:
Design and Operation: A ball valve uses a ball to control the flow, which provides better sealing. Flanged butterfly valves use a rotating disc to control the flow, making them simpler and more compact.
Application: Ball valves are better for applications where you need a tight seal and high pressure. Flanged butterfly valves are more cost-effective for larger flow systems where you need to control the flow, but you don’t need to seal as well.
Compared to a Gate Valve:
Control: Gate valves are used to fully open or fully close the flow, typically in high-pressure applications. They use a rising stem to move the gate up and down to block or allow the flow. Flanged butterfly valves allow you to control the flow more precisely because the disc rotates.
Size and Installation: Flanged butterfly valves are generally smaller and lighter than gate valves, which are larger and heavier, especially for large-diameter pipes.
Compared to a Globe Valve:
Flow Control: Globe valves are designed to control the flow precisely, giving you a throttling effect when you need it. Flanged butterfly valves can control the flow, but they’re not as precise and are used in applications where you need to be all the way open or all the way closed.
Size and Complexity: Globe valves are more complex and larger because of their internal structure, while flanged butterfly valves are simpler and smaller, making them great for large systems where space and ease of maintenance are important.
In short, flanged butterfly valves are known for their small size, cost-effectiveness, and ability to handle large flow systems. They’re great for medium to high-pressure applications and large pipelines where you need to install them easily, save weight, and save space. Compared to other valves like ball valves, gate valves, and globe valves, flanged butterfly valves are simpler, lighter, and control the flow well, but they may not seal or handle pressure as well as ball or gate valves.
Different structure, Different material flanged butterfly valve application
1, Water Supply Systems
Pressure Range: Typically low to medium pressure, ranging from 0.5 to 10 MPa (5 to 100 bar) depending on the system.
Valve Design: For most water supply systems, a centerline (single eccentric) butterfly valve is ideal because it’s simple and cost-effective. It provides a good seal for low to medium-pressure applications, making it suitable for most municipal water pipelines.
Materials:
Body: Ductile Iron (also known as nodular cast iron) is a good choice because it has good mechanical properties, is strong, and resists corrosion in water systems.
Stem: Stainless Steel (e.g., SS304 or SS316) is commonly used for the valve stem because it resists corrosion, especially when it’s in contact with water and other liquids.
Seal: EPDM (Ethylene Propylene Diene Monomer) is a good choice for water systems because it seals well, resists aging, and works well in both cold and warm water.
Valve Size: For standard water supply systems, centerline butterfly valves are fine. However, for larger systems with higher flow rates, you might consider a double-eccentric design (see below).
2, Large Diameter Pipes or High Flow Systems
Pressure Range: Similar to water systems, the pressure might still be low to medium (up to 10 MPa), but the flow rate will be higher because the pipe is bigger.
Valve Design: For large diameter valves or high flow systems, a double-eccentric butterfly valve is a good choice. The double-eccentric design reduces the friction between the seat and the disc, making the valve easier to operate and reducing the torque needed to open or close the valve. This is especially important for larger valves where high torque can make the valve hard to operate.
Materials:
Body: Ductile Iron is still a good choice for large-sized valves because it balances strength and weight, although in some cases, you might consider carbon steel or stainless steel for more durability and corrosion resistance.
Stem: Stainless Steel (typically SS304 or SS316) is still the preferred material for the stem because it resists corrosion and is reliable over the long term.
Seal: EPDM for water or NBR for oil-based applications. For larger systems or special environments, you might use metallic sealing (e.g., Stainless Steel seats) for high temperature or high-pressure situations.
3, Seawater or Coastal Environments
Pressure Range: Generally low to medium pressure (around 0.5 to 6 MPa depending on the location and application).
Valve Design: A triple-eccentric butterfly valve (also known as a concentric triple-offset valve) is a great choice for harsh environments like seawater applications. The triple-eccentric design ensures that the valve is less affected by temperature changes and provides superior performance when opening or closing the valve.
Materials:
Body: Ductile Iron with marine-grade coatings or Stainless Steel (especially SS316 or SS316L) for maximum corrosion resistance in salty environments.
Stem: Stainless Steel (preferably SS316) to resist corrosion from the salty seawater environment.
Seal: EPDM for cold water or NBR for oil-based fluids. In highly corrosive environments, you might use a rubber-lined valve with ceramic or PTFE lining.
4,Oil and Gas Systems
Pressure Range: Can be medium to high pressure (typically 5 MPa to 20 MPa or more).
Valve Design: In oil and gas systems, double-eccentric butterfly valves or triple-eccentric butterfly valves are preferred. These valves can handle higher pressures and make it easier to operate the valve because they require less torque.
Materials:
Body: Carbon Steel or Stainless Steel (often SS316 or SS304) for better strength and durability in oil and gas applications.
Stem: Stainless Steel (again, SS316 is a popular choice) because it resists corrosion and the high mechanical stresses found in the industry.
Seal: NBR (Nitrile Rubber) seals are commonly used in oil-based systems because they resist oils and petroleum products.
5, Chemical Processing
Pressure Range: Varies, but can often be high-pressure systems (up to 20 MPa or more depending on the application).
Valve Design: Double-eccentric or triple-eccentric butterfly valves are ideal for chemical processes because they minimize seat wear and provide excellent sealing properties even at high pressures or with corrosive media.
Materials:
Body: Stainless Steel (SS304 or SS316) for most chemical processes, although you might need specialized alloys (like Hastelloy or Inconel) for very aggressive chemicals.
Stem: Stainless Steel (typically SS316 or SS316L).
Seal: For aggressive chemicals, you might need PTFE (Polytetrafluoroethylene) or Viton seals because they resist chemical attack.
Summary of Selection:
For general water supply systems, use centerline butterfly valves made of ductile iron with an SS316 stem and EPDM seals for a reliable, cost-effective solution.
For large diameter or high flow systems, consider double-eccentric butterfly valves to reduce the torque needed and make the valve easier to operate.
In seawater or coastal environments, choose triple-eccentric butterfly valves with marine-grade stainless steel and EPDM or NBR seals for superior corrosion resistance.
For oil and gas or chemical processing, use double or triple-eccentric butterfly valves with stainless steel or carbon steel bodies and seals that are appropriate for the medium (e.g., NBR for oil, PTFE for chemicals).
Flanged butterfly valve for seawater
Size range and pressure for different materials flanged butterfly valves
- Ductile Iron (Nodular Cast Iron)
Size Range:
From DN50 (2 inches) to DN2000 (80 inches) or larger.
Ductile iron butterfly valves are available in sizes from small (DN50) to very large (DN2000), making them suitable for a wide range of pipeline applications.
Pressure Rating:
PN10, PN16, PN25, PN40 (Pressure Nominal ratings for 10 bar, 16 bar, 25 bar, and 40 bar).
PN10 or PN16 is commonly used for water supply or HVAC systems.
PN25 or PN40 may be required for higher pressure applications in more demanding industrial systems.
Applications:
Water treatment, wastewater systems, HVAC, and general industrial use.
Ductile iron provides a good balance of strength, weight, and corrosion resistance, making it suitable for general-purpose applications. - Cast Iron (Gray Cast Iron)
Size Range:
Typically from DN50 (2 inches) to DN1200 (48 inches).
Cast iron valves are available in medium to large sizes but are not suitable for very large diameter systems.
Pressure Rating:
PN10, PN16 (Pressure Nominal ratings for 10 bar, 16 bar).
Cast iron butterfly valves are limited to lower pressure ratings due to the material’s brittleness compared to ductile iron or steel.
Applications:
Low to medium-pressure applications, such as water distribution systems and certain low-pressure industrial applications.
Cast iron is commonly used for non-corrosive media and lower-pressure systems. - Stainless Steel (SS304, SS316)
Size Range:
From DN50 (2 inches) to DN3000 (120 inches) or more.
Stainless steel valves can be manufactured in a wide range of sizes, including larger sizes, particularly when corrosion resistance is required in harsh environments.
Pressure Rating:
PN16, PN25, PN40, PN63 (Pressure Nominal ratings for 16 bar, 25 bar, 40 bar, and 63 bar).
Stainless steel butterfly valves are available for medium and high-pressure applications, with PN25 to PN63 suitable for industrial and chemical processes, especially where higher corrosion resistance is needed.
Applications:
Food processing, chemical processing, pharmaceutical industries, marine, and seawater systems.
Stainless steel offers excellent corrosion resistance, making it ideal for applications with aggressive chemicals or saline environments. - Carbon Steel (CS)
Size Range:
From DN50 (2 inches) to DN2000 (80 inches) or larger.
Carbon steel butterfly valves can be made in a wide range of sizes, from small to very large, making them versatile for a variety of applications.
Pressure Rating:
PN16, PN25, PN40 (Pressure Nominal ratings for 16 bar, 25 bar, and 40 bar).
Carbon steel valves are commonly used for medium to high-pressure applications, but the maximum pressure rating will depend on the specific material grade and valve design.
Applications:
Oil and gas pipelines, industrial water systems, heating systems, and other general industrial applications.
Carbon steel is more affordable than stainless steel and is ideal for non-corrosive media, but it may require protective coatings or linings in corrosive environments.
Summary of Materials, Sizes, and Pressure Ratings:
| Material | Size Range | Pressure Ratings | Typical Applications |
|---|---|---|---|
| Ductile Iron | DN50 to DN2000 (2" to 80") | PN10, PN16, PN25, PN40 | Water treatment, HVAC, industrial systems, general pipelines. |
| Cast Iron | DN50 to DN1200 (2" to 48") | PN10, PN16 | Low to medium-pressure applications (water, non-corrosive). |
| Stainless Steel | DN50 to DN3000 (2" to 120") | PN16, PN25, PN40, PN63 | Food, chemical, pharmaceutical, marine, high-corrosion areas. |
| Carbon Steel | DN50 to DN2000 (2" to 80") | PN16, PN25, PN40 | Oil, gas, industrial water, general industrial use. |
Key Considerations:
Ductile iron is commonly used for general applications due to its good strength-to-weight ratio and cost-effectiveness.
Cast iron is suitable for low-pressure systems but should be avoided in high-stress environments due to its brittleness.
Stainless steel is the material of choice for highly corrosive environments or high-temperature systems, providing excellent durability and long service life.
Carbon steel is ideal for applications where corrosion resistance is not a major concern but strength and durability are required for heavy-duty systems.
Installation and Maintenance
Installation
Check the Valve and Piping:Before installing the flanged butterfly valve, inspect the valve and its components to ensure there are no damages, cracks, or deformations.
Make sure the flange size and bolt hole alignment of the valve match the pipe flanges.
Installation Location:The flanged butterfly valve should be installed in a straight section of the pipeline, either horizontally or vertically, depending on the application. Do not install it near elbows or areas with high-pressure fluctuations.
Seal Surface Check:Make sure the sealing surfaces of both the valve and pipe flanges are clean and free of debris, oil, or dirt. Clean them using a soft cloth or brush if necessary.
Flange Connection:Connect the flanged butterfly valve to the pipeline flanges using bolts. Make sure the valve is aligned correctly, and the flow direction is marked properly.
Tighten the bolts evenly to prevent any sealing issues from uneven pressure.
Sealing Material:If necessary, use a gasket (such as rubber or metal) between the valve and the pipe flange. Make sure the gasket material is compatible with the operating conditions, such as temperature and pressure.
Correct Orientation:Install the valve so that its flow direction aligns with the pipeline flow. Some valves have direction indicators; make sure to follow them during installation.
Valve Stem and Actuator:For valves with an actuator (electric or pneumatic), make sure the valve stem is properly connected to the actuator for smooth operation.
Special Installation Conditions:
Temperature and Pressure:Consider the valve’s rated pressure and temperature range, especially for high-pressure or high-temperature applications. Make sure the valve you choose meets these requirements.
Corrosive Media:For pipelines carrying corrosive media, use corrosion-resistant materials (like stainless steel or coated valves) and make sure the sealing materials are compatible with the fluid.
Vibration or Shock:If the system experiences significant vibration or shock, you may need to install vibration-dampening measures or choose valves designed to withstand such conditions.
How to Maintain and Inspect a Flanged Butterfly Valve:
Regular Seal Performance Check:Periodically check the sealing performance of the valve. Make sure there is no leakage when the valve is closed. If you find a leak, you may need to replace the gasket or repair the sealing surfaces.
Cleaning:Regularly clean the valve to remove dirt, grease, or other contaminants that could affect the valve’s operation. Use a soft cloth or brush to avoid damaging the sealing surfaces.
Lubrication:For manual valves, regularly lubricate the valve stem and sealing surfaces to reduce friction and ensure smooth operation.
For actuated valves, check the actuator’s lubrication and make sure it moves freely.
Check for Operational Smoothness:Periodically test the valve’s opening and closing functions to make sure it operates smoothly. If the valve is hard to operate, check for blockages, lack of lubrication, or mechanical issues.
Inspect Bolts and Connections:Regularly inspect the bolts and flange connections to make sure they are tight. After extended operation or system startup, bolts may loosen, causing leakage or valve instability.
Check for Leaks:During operation, inspect for leaks around the valve body and the sealing surfaces. If you find any leaks, address them promptly by tightening bolts or replacing seals.
Check Coatings:If the valve is coated for corrosion resistance, periodically inspect the coating for wear and tear. If it is damaged, reapply the coating to maintain the valve’s protective properties.
Monitor Temperature and Pressure:Make sure the valve is operating within its designed pressure and temperature limits. Exceeding these parameters can shorten the valve’s lifespan and lead to failure.
In Summary:
Proper installation and regular maintenance of a flanged butterfly valve are essential to ensuring its long-term and reliable performance. By checking the sealing integrity, smooth operation, and performing regular maintenance tasks such as lubrication, cleaning, and bolt inspection, you can minimize the risk of failure and extend the service life of the valve. Regularly monitoring operating conditions, especially temperature and pressure, will help ensure optimal performance.
Flanged Butterfly Valve for Underground Pipeline
Sometimes we need to install flanged butterfly valve underground, then we need extension spindle to extension the operation to ground, below is our flanged butterfly valve with extension spindle drawing
Horizontally Installed Butterfly Valves VS Vertically Installed Butterfly Valve
Butterfly valves can be installed horizontally and vertically
1、Horizontally installed valve shaft in the horizontal direction, the valve well width should be larger.
2、Vertically installed valve shaft in the vertical direction, the valve well will need to be very deep.
3、Horizontally installed butterfly valve is good choice for vertical arrangement of the height is restricted occasions. It can effectively avoid the high temperature radiation above the valve. The disadvantage is that it takes up a lot of space.
4、Vertically installed butterfly valve takes less space and is easy to install, the disadvantage is that if the pipeline is high it is not conducive to maintenance.
Concentric VS Double Eccentric
Concentric butterfly valve
1, The core of stem, disc and body is same
2, Sealing method is resilient seated, can’t be metal seated because valve body and valve disc have a large contact area. Because it is resilient seal, can’t used for high temperature fluid or gas
3,Connection ends can be wafer, lug, flange ,groove etc
4, Open and close resistance is large, the valve disc has a large contact area with the valve body, easy to wear, short service life.
Double Eccentric butterfly valve
1. The core of the stem is not same as the disc and body
2. Double eccentric butterfly valve can resilient seated or metal seated, metal seated type can be used for high temperature fluid or gas.
3.Connection ends is flanges
4. Compare to concentric butterfly valve ,the disc of double eccentric butterfly valve can separate with seat immediately once the disc is open,There is no significant friction between the valve disc and the body as in the concentric butterfly valve, thus reducing the opening torque and the wear on the sealing surfaces.
5, Double eccentric butterfly valve can’t afford higher pressure.
RFQ
How do I deal with leaks in a flanged butterfly valve?
Leaks in a flanged butterfly valve can be caused by several factors, including damaged seals, improper installation, or valve body defects. Here are some common steps to address the problem:
Check the sealing surfaces: Inspect the sealing surfaces for damage or contamination. Clean or replace the sealing gasket as needed.
Check the installation: Make sure the valve is installed according to the standards and that the bolts are tightened evenly to prevent improper installation that can cause leaks.
Check the connection between the valve body and the pipe: Ensure the valve body is correctly aligned with the pipeline and that there is no misalignment or uneven pressure.
Replace damaged parts: If the gasket or other sealing components are damaged, replace them immediately.
Re-adjust the valve: If the valve is not adjusted correctly, it may not seal properly. Make the necessary adjustments to ensure it operates correctly.
How do I choose the right sealing material for a flanged butterfly valve?
When selecting sealing materials, you need to consider factors such as the medium in the pipeline, the operating temperature, pressure, and environmental conditions. Common sealing materials include:
EPDM (Ethylene Propylene Diene Monomer): Suitable for water, steam, acidic and alkaline media. It has excellent UV resistance and aging performance, making it ideal for outdoor use.
NBR (Nitrile Rubber): Suitable for oil-based media, commonly used in oil and gas pipelines.
PTFE (Polytetrafluoroethylene): Has excellent chemical stability and is ideal for highly corrosive media such as acids, alkalis, and solvents.
FKM (Fluoroelastomer): Best for high-temperature applications or environments requiring chemical resistance, commonly used in the oil, gas, and chemical industries.
Metal seals: Used for high-temperature, high-pressure, or special environments where other materials might not perform well.
