Flanged Butterfly Valve
Your Professional Flanged Butterfly Valve Supplier!
Tianjin Liangfa Technology Co., Ltd. is located in Tianjin City, which enjoys the reputation of “China’ s hometown of butterfly valves”. It is a large-scale valve manufacturing company integrating R&D, production and sales.
Why Choose Us
Strict Production Control
Our products are manufactured to very high standards. The products have passed ISO9001: 2000 international quality management system certification, ISO 14001: 2004 environmental management system certification, and GB/T 28001-2001 occupational health and safety management system certification.
Full Support
Possess all kinds of excellent large and medium-sized main production equipment and main inspection and testing equipment and instruments. To ensure that you don’t have any concerns, we offer comprehensive technical services including pre-sales, manufacturing, and post-sales care.
Rich experience
Deeply plowing the valve industry for more than 20 years, we are dedicated to strict quality control and attentive customer service, our experienced staff is always available to discuss your requirements and ensure complete customer satisfaction.
Wide Product Range
Our company provides an extensive selection of valve products. Our product includes butterfly valves, high-temperature and high-pressure valves, gate valves, check valves, globe valves, regulating valves, ball valves, water supply and drainage valves, marine valves, API valves, and more, addressing various fluid flow control needs.
Flanged butterfly valve refers to a butterfly valve with two flanges. It is one of the most frequently used valve types in industrial systems. It is small in size and light in weight, and can be made into a large diameter. Flange butterfly valves are suitable for industries such as water supply and drainage, sewage, food, heating, gas, ships, hydropower, metallurgy, energy systems and textiles with temperatures ≤120°C or ≤150°C and nominal pressures ≤1.6MPa. They are especially suitable for two-way sealing and in situations where the valve body is prone to rust, it is used as a flow regulating and intercepting medium.
Advantages of Flanged Butterfly Valve
Lightweight and Compact
Flanged butterfly valves are great for multiple applications because they are very lightweight and provide reasonable flow control in a compact design. You will generally want to use a metal-seated valve for more extreme fluid processing, while a flat face flanged butterfly valve is best for applications with low pressures and temperatures. The flanges take up little space but offers enough strength for most pump systems.
Simple Construction
Flanged butterfly valves are very simple in design and have minimal maintenance requirements. They are easy to install and operate. They do not require much torque to operate and can be automated for energy-efficient operation.
Easy Operation
The 90-degree turning radius allows for quick sealing upon actuation, which provides more accurate flow control with minimal effort to turn the valve on and off. Different flange butterfly valves are to consider, including flat face butterfly valve, raised face flange butterfly valve and ring type joint flange butterfly valve. The pressure will usually determine which type you need. The higher the offset, the more pressure the valve can handle.
Pressure Control
In addition to precision flow control, butterfly valves are excellent for pressure control. They experience minimal pressure drop during operation before the fluids recover energy quickly after leaving the valve. This keeps the pump system running efficiently with consistent fluid pressures.
Flat Face (FF) Flanges: Fancy a connection that’s simple yet effective? The flat face flange might be the perfect match. In a flat-face flange, the surface of the flange is flat, providing an even sealing surface. Flat face flanges prefer to mingle with their mirror images. In simple terms, these flanges are ideally paired with another flat face flange for perfect alignment and a tight seal. They shine brightest in low-pressure applications where a robust seal is not deemed mandatory.
Raised Face (RF) Flanges: If you’re seeking a bit more fortitude in your connection, raised face flanges bear the flag. As the name implies, these flanges sport a small elevation around the bore. This raised ‘lip’ interfaces beautifully with a compatible gasket and the face of a counterpart flange creates a secure seal. This ‘raised face’ provides a more robust connection, making it the go-to for high-pressure operations.
Ring Type Joint (RTJ) Flanges: Now, for the most demanding scenarios incorporating extremely high pressure or high temperature, the ring type joint flanges will not disappoint you. This flange connection carries a circular groove where a metal ring gasket sits to provide a high-integrity, high-pressure seal. This powerful connection type is indeed a force to be reckoned with.
Components of Flanged Butterfly Valves
Body
The body of a flanged butterfly valve is the main structure that houses all the other components. It is designed to provide a reliable and leak-proof seal between the valve and the pipeline. Flanged butterfly valves can have a variety of body materials such as cast iron, stainless steel, or PVC.
Disc
The disc is a circular plate that is positioned in the center of the body. It is designed to rotate inside the body and control the flow of fluids through the valve. The disc can be made from a variety of materials such as stainless steel, aluminum, or plastic.
Stem
The stem is a long, narrow rod that connects to the center of the disc and extends outside the valve body. The stem is used to rotate the disc when the valve is opened or closed. The stem can be operated manually or automatically using an actuator.
Seat
The seat is a ring-shaped component that is located on the inside of the valve body around the disc. It is designed to provide a tight seal when the valve is closed and prevent any fluid from leaking through the valve.
Flange
Flanges are the external connections on the valve body that allow the valve to be bolted to the pipeline. They provide a secure and leak-tight connection between the valve and the pipeline.
Actuator
The actuator is an external device that is used to control the position of the valve. It can be a manual lever or wheel, or it can be an automatic device such as an electric or pneumatic actuator. The actuator is used to rotate the stem and control the opening and closing of the disc.
Bearing and bushing
Bearings and bushings are essential mechanical components that facilitate smooth, efficient motion by reducing friction and wear between moving parts in a wide array of machinery and equipment. These components support and guide rotating or sliding elements, such as shafts, gears, and wheels, enabling accurate positioning and improving overall performance and lifespan of the system.
Water treatment plants
Flanged butterfly valves are commonly used in water treatment plants to control the flow of water in the treatment process. The valve is used to regulate the flow of chemicals like chlorine, which the plant needs to treat the water.
HVAC systems
Flanged butterfly valves are used in heating, ventilation and air conditioning (HVAC) systems to regulate the flow of air and water. The valve regulates the temperature in the system and controls the flow of air or water to maintain the desired temperature level.
Process industries
Butterfly valves are frequently used in chemical, petrochemical, and pharmaceutical industries to control the flow of liquids and gases. It is made up of corrosion-resistant materials that can withstand highly corrosive substances.
Food industry
In the food industry, flanged butterfly valves are used in various operations, including controlling the flow of liquids or gases, controlling temperature and pressure levels during processing and preventing product contamination.
Marine and shipbuilding industries
Flanged butterfly valves are used in the marine and shipbuilding industries to control the flow of fluids and gases within the ship. It helps to prevent the leakage of fluids or gases and regulates fluid pressure during operation.
Flanged Valves vs Threaded Valves
Flanged valve
Overview
Flanged valves have flanges on both ends that connect two materials through an external or internal lip. A gasket can be added between the two materials to prevent leakage. They come in many types such as flat face (FF) flange and raised face (RF) flange.
Widely used in oil and gas, chemical processing, power generation, water treatment and other industries.
Complying with industry standards such as ANSI/ASME B16.5, DIN 1092-1/ISO 7005 and SAE J518, flange grades such as Class 150, Class 300 and Class 600.
Advantages
Versatility: Flanged valves are compatible with different pipe sizes and materials including steel, cast iron and PVC for chemical fluids.
Easy Removal: Unlike threaded valves, they can be removed from the system without disturbing other components.
Strength and durability: Flange connections have good connection strength and can be used in high-pressure and high-temperature scenarios.
limit
Cost: The installation of a flanged valve is more expensive due to the need for bolt tightening and gasket replacement.
Dimensions: Flange connections are generally bulkier than threaded valves and not suitable for space-constrained applications. But they are relatively small in applications with high-pressure requirements.
Overview
Threaded valves, also known as screwed valves, have threaded ends that connect directly to compatible pipes or fittings.
Thread standards include BSP, NP and UTS. They commonly used in piping systems, small industrial processes and residential applications.
Advantage
Simple Operation: They easy to install or replace, no additional tools required, no bolts to tighten.
Compact: Threaded valves are lighter, more space-saving, suitable for small spaces.
Cost Effective: They have lower costs since there are no multiple parts and flange configurations.
limit
Limited Stress Tolerance: Threaded valves are less capable of handling high pressures and temperatures than other connection types.
Corrosion Problem: Threaded connections are more susceptible to corrosion, potentially weakening the connection.
Potential Leaks: Over time, wear or looseness of threaded valves can cause leaks, requiring proper installation and maintenance.
Installation of Flanged Butterfly Valve
Choose a suitable location in the pipeline to install the flanged butterfly valve. Ensure that the valve is easily accessible for operation, maintenance and inspection.
Clean the flange surfaces on both sides of the pipeline thoroughly. Check the flange surface for any irregularities, such as pits or foreign matter. Remove any debris or contaminants to ensure a proper sealing surface.
Align the flange plate or flange sleeve of the flanged butterfly valve with the corresponding pipe flange surface. Insert the bolts through the bolt holes and secure the two flanges together. Gradually tighten the bolts in a diagonal pattern to ensure even pressure distribution and a tight seal.
Once the flanged butterfly valve is installed and the flanges are securely connected, perform a visual inspection to ensure proper alignment. Operate the valve to check if it moves freely without any obstructions or sticking points. Remember to recheck the valve cover or bonnet to ensure it is tightly fastened and there are no signs of leakage.
After the installation is complete, conduct a trial run of the flanged butterfly valve. Open and close the valve multiple times to verify its smooth operation. Monitor the system for any signs of leakage or abnormal behavior. If any issues are detected, such as leakage or valve sticking, promptly address them by adjusting or repairing the valve.
Certifications
Our Factory
The company occupies a total area of more than 3,000 square meters. There are more than 50 employees, and all kinds of excellent large and medium-sized main production equipment as well as main inspection and testing equipment and instruments.
Ultimate FAQ Guide to Flanged Butterfly Valve
Q: What is a flanged butterfly valve?
Q: How does a flanged butterfly valve work?
Q: What are the main components of a flanged butterfly valve?
Q: What are the advantages of using a flanged butterfly valve over other types of valves?
Q: Can flanged butterfly valves be used for both on/off and throttling applications?
Q: What are the different types of seat materials used in flanged butterfly valves?
Q: What materials are used for the butterfly disc/plate?
Q: How is the disc connected to the central shaft?
Q: What is the role of the actuator/handle?
Q: What is the function of sealing elements in a flanged butterfly valve?
Q: How are flanged butterfly valves connected to pipelines?
Q: What industries commonly use flanged butterfly valves?
What is the typical pressure rating of flanged butterfly valves?
The pressure rating of flanged butterfly valves varies depending on the valve size, materials, and design standards. Common pressure ratings range from PN6 (Class 150) to PN40 (Class 600), although higher pressure ratings are available for specialized applications.
Q: Can flanged butterfly valves be used for both horizontal and vertical pipe orientations?
Q: Are flanged butterfly valves suitable for applications requiring low flow rates?
Q: Do flanged butterfly valves require regular maintenance?
Q: Can flanged butterfly valves be used in hazardous or explosive environments?
Q: Can flanged butterfly valves be used for underground applications?
Q: Can flanged butterfly valves be used for bi-directional flow control?
Q: Are flanged butterfly valves suitable for high-temperature applications?
Q: What makes flanged butterfly valves versatile for industrial applications?