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What is Centre-pivoted Butterfly Valve
A centre-pivoted butterfly valve is a type of rotary valve used to control the flow of fluids through a pipe. It consists of a circular disc mounted on a rod that extends through the center of the valve body. This rod allows the disc to rotate around its axis within the body of the valve.The operation of a centre-pivoted butterfly valve is straightforward. When the disc is rotated to a position perpendicular to the flow (typically 90 degrees from the fully closed position), the valve is fully open, allowing maximum flow through the pipe. Conversely, when the disc is rotated to align with the flow path (0 degrees), the valve is closed, preventing fluid passage. Intermediate positions of the disc result in intermediate flow rates.
Rich experience
The company' s founder team graduated from mechanical and electrical automation majors and has been engaged in the valve industry for more than 20 years. It is committed to providing customers with a complete set of fluid control solutions. It is a company integrating scientific research and development, A large-scale valve enterprise integrating testing and testing, manufacturing and sales.
Wide product range
The company mainly produces API 6D pipeline ball valves, gate valves, globe valves, check valves, plug valves and API 609 series butterfly valves in 6 categories, with more than 1,000 specifications and varieties. Products widely cover petrochemical, coal chemical, nuclear power, LNG, marine, aerospace, metallurgy, papermaking and other industries.
Complete qualifications
The company has a complete international standardized management system, adopts the world's top precision casting technology and modern intelligent electronic detection system, and uses advanced SAP resource management, strip storage management system and ERP system to effectively manage the factory.
High standard products
After years of hard work and development, it has become a key backbone enterprise in the valve industry. It specializes in improving the innovation and manufacturing capabilities of special valves in harsh industrial environments. High-quality products and fast after-sales service have won praise and trust from customers at home and abroad.
Lightweight and Compact
Centre-pivoted butterfly valve are great for several 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 soft-seated butterfly valve is best for applications with low pressures and temperatures. The butterfly disc takes up little space but offers enough strength for most pump systems.
Simple and Cost Effective
Centre-pivoted butterfly valve are very simple in design and have minimal maintenance requirements. They are easy to install and operate. Plus, they are typically much less expensive than a ball valve of the same size. They do not require much torque to operate effectively and can be automated for energy-efficient operation.
Quick and Efficient
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 Centre-pivoted butterfly valve are to consider, including zero-offset, double-offset, and triple-offset. 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, Centre-pivoted butterfly valve 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.
How to Choose Centre-pivoted Butterfly Valve
Material: Take into account the operating environment, design life, and the nature of the media being handled. Consider factors such as temperature, pressure, corrosiveness, and the cost and availability of the candidate materials. Common choices include: carbon steel, stainless steel, PVC (polyvinyl chloride), and CPVC (chlorinated polyvinyl chloride).
Valve Sizing: When determining valve size, consider the specific gravity and viscosity of the fluid; inlet and outlet pressures; maximum capacity; and maximum pressure drop.
Seat Type: Resilient seats, constructed from elastomeric materials like Buna-N®, EPDM (ethylene propylene diene monomer), and Viton®, provide excellent sealing performance. On the other hand, metal seats, typically composed of stainless steel or other alloys, are preferable in high-pressure and high-temperature applications.
Disk Type: Concentric disks work well in low-pressure settings, whereas eccentric disks (double or triple offset) are more appropriate for high-pressure environments, offering enhanced control and sealing performance.
Actuator Type: Choose from three primary actuator types: electric, manual, and pneumatic. Manual actuators are operated by hand and offer simplicity. Electric and pneumatic actuators, on the other hand, provide automation, which can be especially beneficial for large or remote systems requiring frequent, accurate flow rate adjustment, enhancing control in valve operation.
Speed of Actuators: Fast-acting actuators are ideal for quick isolation or opening while slow-acting actuators are suitable for controlled, gradual adjustments.
Fluids: The nature of the moving liquid or gas plays a crucial role in determining the appropriate valve type and disk material. For gas systems, valves should be sealed tightly to meet leak rate requirements. For slurry applications, especially ones that contain abrasive particles, considerations include preventing premature wear on rubber seats, addressing obstructed orifices created by the disk, and avoiding issues like disk jamming or material entrapment between the disk and seat. These more than affect fluid flow efficiency, causing the valve not to be able to open, close, or maintain a desired flow rate.
Simple Design
The design of a centre-pivoted butterfly valve is relatively simple compared to other types of valves, which makes it easy to install, operate, and maintain.The valve operates with a quarter turn of the handle or actuator from the fully closed to the fully open position, allowing for quick and efficient control of flow.
Lightweight and Cost-Effective
Due to their simplicity and minimal material requirements, centre-pivoted butterfly valves are typically lighter and more cost-effective than other valves, such as ball valves or gate valves.
Compact Size
These valves have a compact design, which makes them suitable for applications where space is limited.Unlike traditional butterfly valves, centre-pivoted designs offer better flow control characteristics. They can be used for throttling applications, where precise control of flow rate is required.
Low Torque Requirement
The centre-pivoted design reduces the torque required to operate the valve, which can extend the life of actuators and reduce operational costs.The symmetrical design ensures even load distribution on the seating surfaces, reducing wear and tear, and extending the service life of the valve.
Water and Wastewater Treatment: These valves are commonly used to control the flow of water in treatment plants, including the intake, distribution, and outflow of water. They are also used in sewage systems for controlling the flow of wastewater.
HVAC Systems: Centre-pivoted butterfly valves are used in heating, ventilation, and air conditioning systems to regulate airflow through ductwork.
Chemical Processing: In chemical plants, these valves are employed for the control of corrosive and abrasive fluids. They can handle a wide range of temperatures and pressures.
Power Generation: In power plants, centre-pivoted butterfly valves are used for the control of fuel gas, water, and slurries. Their quick-closing capability makes them suitable for emergency shutdown scenarios.
Mining and Mineral Processing: These valves are used in mining operations for controlling the flow of slurries and other viscous substances.
Oil and Gas Industry: Centre-pivoted butterfly valves are used in pipelines for the control of crude oil, natural gas, and refined products. They are often designed to meet stringent API standards for the oil and gas sector.
Pulp and Paper Manufacturing: In the paper industry, these valves are utilized for controlling the flow of pulp and other process fluids.
Food and Beverage Industry: Centre-pivoted butterfly valves are used in the food and beverage industry for controlling the flow of liquids and sometimes solids, where they must comply with hygienic standards.
Pharmaceutical Manufacturing: In pharmaceutical applications, valves must be easy to sterilize and meet strict sanitary requirements, which centre-pivoted butterfly valves can often provide.
Marine and Shipbuilding: These valves are used on ships and offshore platforms for the control of various fluids, including ballast water, potable water, and fuel.
Stainless Steel: Stainless steel is a steel alloy that contains higher chromium content (10.5-30%), and trace amounts of nickel and molybdenum. Stainless steel is known for its high strength and toughness and corrosion and weather resistance. The corrosion resistance is attributed to its chromium content: a thin, inert chromium oxide layer is formed to prevent oxygen diffusion into the bulk of the material. When the surface is damaged or scratched, the chromium oxide layer reforms with the help of oxygen. This self-healing property disables rust formation.
Carbon Steel: Carbon steel is a steel alloy that has a higher carbon content of up to 2.5%. It has good mechanical properties and can be used for applications in which there are no special requirements. The common carbon steel grades available for butterfly valves are ASTM A216 WCB (Welded Cast B-grade) and LCC (Low Carbon Content). WCB grade is used for high-temperature applications while the LCC is used at low temperatures. The valve body and disc of the butterfly valves are produced by a sand-casting process.
Hastelloy: Hastelloy is an alloy composed of nickel, chromium, and molybdenum; it was the first alloy formulated by Haynes International, Inc. It also has high strength, which is maintained at high temperatures, and it has excellent resistance to corrosion, cracking, and oxidizing and reducing agents. They are used to handle nitric, hydrochloric, and sulfuric acids at moderate temperatures.
Brass: Brass is an alloy of copper and zinc. It is a tough and durable material and can also withstand high temperatures. It is valued for its corrosion and biofouling properties, as well as for its anti-microbial properties that inhibit the growth of microbes and biofilms on its surface.
Nickel Alloys: Nickel alloys are also known for their resistance to corrosion, harsh environments, and high temperatures. They have better performance than stainless steel in highly corrosive environments. However, nickel butterfly valves have high density and are more expensive.
Titanium Alloys: Titanium alloys have a high strength-to-weight ratio. They are also known for corrosion and biofouling resistance and can be used in seawater environments and water treatment since they are non-toxic. However, titanium butterfly valves are also expensive.
Nickel Aluminum Bronze: Nickel Aluminum Bronze is a copper-based alloy that contains 10% aluminum, 5% nickel, and 5% iron. It is also known for its corrosion, antimicrobial, and biofouling properties. Nickel Aluminum Bronze butterfly valves are also used in seawater environments (e.g., offshore piping), water purification, and wastewater treatment.
A centre-pivoted butterfly valvee body can be made of cast iron, ductile iron, aluminum, carbon steel, stainless steel and exotic metals. Butterfly valves are available in wafer and lug style. Wafer style valves are installed “sandwiched” between pipe flanges. This style of valve is easier to replace or install. However, replacing a wafer valve requires the conveying line to be drained. Once the valve is removed, there is nothing to seal material either upstream or downstream from the removal point.
Resilient seated valves are the most commonly used types. The interior of the valve body is lined with an elastomer seat. Seats may be made of EPDM, buna, viton, Teflon, natural rubber, carbox, chlorbutyl, white buna, or white neoprene as well as other materials. Choice of seat material depends on temperatures, pressures and material handled.The seats of some inexpensive butterfly valves are typically molded into the body and cannot be repaired or replaced. Precision butterfly valves typically contain removable seats that are repairable or replaceable.
The valve disc (controlled by the actuator) regulates the flow of material within the conveying line. Disc materials are available to meet a variety of application demands: stainless steel, aluminum/bronze, ductile iron, ductile/epoxy coated, ductile/nickel plated, ductile/nylon II coated as well as others. As the disc is directly in the material flow stream, care must be taken in specifying the proper material of construction and disc shape. Some discs are designed to allow increased flow patterns through the piping.
The stem passes through the center of the valve, attaches to the actuator, and positions the disc for material flow control and shut off. Depending on the application and valve size, stems may be one or two-piece construction. Typical materials of construction include carbon steel and different grades of stainless steel.
A variety of actuators are available for Centre-pivoted butterfly valve: manual handle, gear, pneumatic, electric and electro-hydraulic. Also, actuators that may be enclosed in special housings and buried are available for certain underground applications.
Regular Inspections: Conduct regular visual inspections of the valve to check for any signs of damage, corrosion, or leaks. Pay special attention to the body, disc, stem, and seals.Operate the valve through its full range several times to ensure smooth movement and proper function. Listen for unusual sounds that might indicate internal issues.
Cleaning: Keep the valve and surrounding area clean to prevent dirt and debris from entering the valve mechanism. Use appropriate cleaning agents based on the material of construction and the service fluid.When shutting down the valve for maintenance, follow proper shutdown procedures to avoid damage to the valve or the connected piping.
Lubrication: Apply lubricant to the moving parts of the valve, such as the stem, gearbox (if applicable), and actuator, to reduce friction and wear. Ensure you use a lubricant compatible with the service environment and materials.
Seal Replacement: Inspect the seals regularly and replace them as necessary. Worn seals can lead to leaks and reduced performance. Consider using high-quality seals that match the operating temperature and pressure of the system.Perform periodic pressure tests to check for leaks under operating conditions. This can help identify potential issues before they cause significant problems.
Actuator Calibration: If the valve is equipped with an actuator, calibrate it according to the manufacturer's recommendations to ensure accurate positioning and operation.Keep a supply of common spare parts on hand, such as O-rings, washers, and lubricants, to facilitate quick replacements and repairs.
SUNAY is a professional manufacturer of valves. Headquartered in Anfeng Industrial Zone, Yongjia, Zhejiang. The company was established in 2010 with a registered capital of 10.8 million yuan and has three holding manufacturing companies. The company's founder team graduated from mechanical and electrical automation majors and has been engaged in the valve industry for more than 20 years. After years of hard work and development, it has become a key backbone enterprise in the valve industry. It specializes in improving the innovation and manufacturing capabilities of special valves in harsh industrial environments. It is committed to providing customers with a complete set of fluid control solutions. It is a company integrating scientific research and development, A large-scale valve enterprise integrating testing and testing, manufacturing and sales.The company mainly produces API 6D pipeline ball valves, gate valves, globe valves, check valves, plug valves and API 609 series butterfly valves in 6 categories, with more than 1,000 specifications and varieties.
We're well-known as one of the leading centre-pivoted butterfly valve manufacturers and suppliers in China. We warmly welcome you to buy or wholesale customized centre-pivoted butterfly valve at competitive price from our factory. Contact us for more details.
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