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What is a Butterfly Valve:
Butterfly valve is a type of valve that uses a disc type opening and closing element to rotate back and forth about 90 ° to open, close, and regulate the fluid channel.
Butterfly valves not only have simple structure, small volume, light weight, low material consumption, small installation size, but also small driving torque, easy and fast operation. They can also have good flow regulation function and closing sealing characteristics at the same time, making them one of the fastest developing valve varieties in the past decade. Especially in industrialized countries such as the United States, Japan, Germany, France, and Italy, butterfly valves are widely used. The variety and quantity of their use are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics, and one valve multifunctionality. Their reliability and other performance indicators have reached a high level, and they have partially replaced globe valves, gate valves, and ball valves. With the advancement of butterfly valve technology, butterfly valves will become the dominant form of valves in the foreseeable short term, especially in the fields of large and medium caliber, medium and low pressure applications.
The original butterfly valve was a simple and loosely closed baffle valve, usually used as a flow control valve and damping valve in water pipeline systems.
With the application of synthetic rubber for chemical corrosion prevention in butterfly valves, the performance of butterfly valves has been improved. Due to its characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, and low cost, synthetic rubber can be selected with different performance according to different usage requirements to meet the operating conditions of butterfly valves. Therefore, it is widely used in the manufacturing of lining and elastic valve seats for butterfly valves.
Due to the strong corrosion resistance, stable performance, low aging resistance, low friction coefficient, easy forming, and stable size of polytetrafluoroethylene (PTFE), and the ability to improve its comprehensive performance by filling and adding appropriate materials, a butterfly valve sealing material with better strength and lower friction coefficient can be obtained, overcoming some limitations of synthetic rubber. Therefore, polymer polymer materials represented by PTFE and their filling modified materials have been widely used in butterfly valves, further improving the performance of butterfly valves. A wider temperature and pressure range, longer sealing performance, and service life butterfly valves have emerged.
In order to meet the requirements of industrial applications such as high and low temperatures, strong erosion, and long service life, metal sealed butterfly valves have made great progress in the past decade. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high-strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperatures, strong erosion, and long service life, with the emergence of large diameter (9750mm) and high pressure (2.2kN/cm) ²)、 The butterfly valve with a wide temperature range (-102~606 ℃) has taken the technology of butterfly valves to a new level.
Due to the application of computer-aided design (CAD), computer-aided manufacturing (CAM), and flexible manufacturing systems (FMS) in the valve industry, the design and manufacturing of butterfly valves have reached a new level. Not only has it comprehensively innovated the design and calculation methods of valves, reduced the heavy and repetitive routine design work of professional technicians, and provided them with more energy to improve the technical performance of products and research and development of new products, shortening the cycle and increasing labor productivity. Especially in the field of metal sealed butterfly valves, due to the application of CAD/CAM, a three-dimensional sealing pair designed by CAD and manufactured by CAM CNC machining has emerged, which ensures that the sealing surface of the valve is free from any compression, abrasion, or wear during the opening and closing process, thereby improving the sealing performance and service life of the butterfly valve by an order of magnitude.
Butterfly valves have a small flow resistance when fully opened, and can perform sensitive flow control when opened between approximately 15 ° to 70 °. Therefore, butterfly valves are widely used in the field of large-diameter regulation and will gradually become the dominant valve type.
Due to the wiping nature of the butterfly valve plate, most butterfly valves can be used for media with suspended solid particles, and can also be used for powder and granular media depending on the strength of the sealing element.
Classification of Butterfly Valves:
1) Classified by structural type: center sealed butterfly valve, single eccentric sealed butterfly valve, double eccentric sealed butterfly valve, and triple eccentric sealed butterfly valve.
2) Classified by sealing surface material:
① Soft sealed butterfly valves have two types of sealing pairs: non-metallic soft materials for non-metallic soft materials and metallic hard materials for non-metallic soft materials.
② Metal hard sealed butterfly valve, its sealing pair is composed of metal hard material to metal hard material.
3) Classified by sealing form:
① Forced sealing butterfly valves are also divided into elastic sealing butterfly valves. The sealing pressure is generated by the compression of the valve seat by the valve plate when the valve is closed, resulting in the elasticity of the valve seat or valve plate; External torque sealing butterfly valve, the sealing pressure is generated by the torque applied to the valve shaft.
② Pressure filled sealing butterfly valve, the sealing specific pressure is generated by the pressure filling of the elastic sealing element on the valve seat or valve plate Automatic sealing butterfly valve, the sealing pressure is automatically generated by the medium pressure.
4) Classified by work pressure:
① Vacuum butterfly valve, a butterfly valve with a working pressure lower than standard atmospheric pressure.
② Low pressure butterfly valve, butterfly valve with nominal pressure ≤ PN16.
③ Medium pressure butterfly valve, a butterfly valve with a nominal pressure of PN25~PN63.
④ High pressure butterfly valve. Butterfly valves with nominal pressures ranging from PN100 to PN800.
5) Classified by working temperature:
① High temperature butterfly valve, butterfly valve with t>450 ℃.
② Medium temperature butterfly valve, butterfly valve with 120 ℃<t ≤ 450 ℃.
③ Butterfly valves at room temperature.
④ Low temperature butterfly valve, butterfly valve with -100 ℃<t<-29 ℃.
⑤ Ultra low temperature butterfly valve, butterfly valve with t ≤ -100 ℃.
6) According to the connection method, it is divided into clamp type butterfly valve, flange type butterfly valve, ear type butterfly valve, and welding type butterfly valve.
Applicable occasions for butterfly valves:
Butterfly valves are suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, which is about three times that of gate valves, when selecting a butterfly valve, the impact of pressure loss on the pipeline system should be fully considered, and the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closed should also be considered. In addition, it is necessary to consider the limitations of the working temperature that the elastic valve seat material can withstand at high temperatures.
The structural length and overall height of butterfly valves are small, with fast opening and closing speeds, and good fluid control characteristics. The structural principle of butterfly valves is most suitable for making large-diameter valves. When using butterfly valves for flow control, the most important thing is to choose the correct size and type of butterfly valve so that it can work properly and effectively. Usually, in throttling, regulating control, and mud media, short structural length and fast opening and closing speed (1/4r) are required. Low pressure cutoff (small pressure difference), it is recommended to use butterfly valves.
Butterfly valves can be used in channels with dual adjustment, contraction, low noise, cavitation and gasification phenomena, small leakage into the atmosphere, and corrosive media. When using butterfly valves under special operating conditions such as throttling adjustment, strict sealing requirements, severe wear, low temperature (deep cold), etc., special three eccentric or double eccentric butterfly valves with specially designed metal sealing belt adjustment devices need to be used.
The midline butterfly valve is suitable for fresh water, sewage, seawater, saline water, steam, natural gas, food, medicine, oil, and various acid-base and other pipelines that require complete sealing, zero gas leakage during gas testing, high service life requirements, and operating temperatures between -10~150 ℃.
Soft sealed eccentric butterfly valves are suitable for bi-directional opening and closing and adjustment of ventilation and dust removal pipelines, and are widely used in gas pipelines and waterways in metallurgical, light industry, power, petrochemical systems, etc. Metal to metal wire sealed double eccentric butterfly valves are suitable for urban heating, steam supply, water supply, gas, oil, acid-base and other pipelines as regulating and shut-off devices.
Metal to metal face sealed triple eccentric butterfly valves are not only used as program control valves for large pressure swing adsorption (PSA) gas separation devices, but also widely used in fields such as petroleum, petrochemical, chemical, metallurgical, and electric power. They are good substitutes for gate valves, globe valves, and so on.
Butterfly Valves Advantages:
Quick and easy operation with a simple quarter-turn mechanism.
Compact design, making them suitable for installations with space constraints.
Resilient seat materials provide a tight seal, minimizing the risk of leakage.
Suitable for both on/off and throttling applications.
Butterfly Valve Applications:
Wafer Concentric Line Resilient Butterfly Valves find applications in a variety of industries and fluid-handling systems where reliable flow control is essential. Here are some common application scenarios: HVAC Systems:Used in heating, ventilation, and air conditioning (HVAC) systems for regulating the flow of water, air, or other fluids.
Water Treatment Plants: Employed in water treatment facilities to control the flow of water, chemicals, or other liquids in different stages of the treatment process.
Chemical Processing: Suitable for use in chemical processing plants to control the flow of various chemicals and corrosive substances.
Power Generation: Found in power plants to regulate the flow of water or other fluids in cooling systems, boiler feedwater systems, and other processes.
Petrochemical Industry: Used in the petrochemical industry for controlling the flow of oil, gas, and various petrochemical products.
Food and Beverage Industry: Applied in food and beverage processing plants to regulate the flow of liquids, including water, juices, and other ingredients.
Wastewater Treatment: Found in wastewater treatment plants for managing the flow of wastewater and treatment chemicals.
Marine and Shipbuilding: Utilized in marine applications, such as shipbuilding, to control the flow of water and other fluids in piping systems.
Mining Industry: Used in mining operations for controlling the flow of water, slurry, and other fluids in mining processes.
General Industrial Applications: Applied in various industrial processes where fluid flow control is necessary, such as in manufacturing plants and factories.
Fire Protection Systems: Found in fire protection systems to regulate water flow in sprinkler systems and fire hydrants.
Oil and Gas Pipelines: Employed in oil and gas pipelines for flow control, especially in situations where a compact design and ease of installation are essential.
Pulp and Paper Industry: Used in pulp and paper mills for controlling the flow of water, chemicals, and pulp slurries.
Pharmaceutical Industry: Applied in pharmaceutical manufacturing for controlling the flow of liquids in production processes.
Mining Industry: Utilized in mining operations for controlling the flow of water, slurry, and other fluids in mining processes
Butterfly Valves Technical Details:
Materials: The valve body is typically made from materials like carbon steel (WCB), stainless steel (CF8, CF3), or other special alloys depending on the specific application requirements.
Size and Pressure Ratings: The valve comes in various sizes, ranging from 1" to 10".
Pressure ratings can vary, with common ranges being 150LB–600LB or PN10–PN64, indicating the maximum pressure the valve can handle.
Standards: The valve is designed and manufactured according to industry standards such as API 6D, API 608, ASME B16.34, ISO 17292, and BS5351.
Face-to-Face Dimensions: The face-to-face dimensions conform to standards like ASME B16.10, BS 558, BS12982, and ISO 5752.
Testing Standards: The valve undergoes testing according to API598, API 6D, BS12569 for pressure testing and API 6FA, API 607 for fire safety testing.
Operator Options: The valve can be operated manually using a handwheel or by using automated methods such as worm gears, electric actuators, pneumatic actuators, or hydraulic actuators.
Shut-off Class: It meets shut-off standards like API 598 (zero leakage) and API 6D.
What is a Butterfly Valve:
Butterfly valve is a type of valve that uses a disc type opening and closing element to rotate back and forth about 90 ° to open, close, and regulate the fluid channel.
Butterfly valves not only have simple structure, small volume, light weight, low material consumption, small installation size, but also small driving torque, easy and fast operation. They can also have good flow regulation function and closing sealing characteristics at the same time, making them one of the fastest developing valve varieties in the past decade. Especially in industrialized countries such as the United States, Japan, Germany, France, and Italy, butterfly valves are widely used. The variety and quantity of their use are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics, and one valve multifunctionality. Their reliability and other performance indicators have reached a high level, and they have partially replaced globe valves, gate valves, and ball valves. With the advancement of butterfly valve technology, butterfly valves will become the dominant form of valves in the foreseeable short term, especially in the fields of large and medium caliber, medium and low pressure applications.
The original butterfly valve was a simple and loosely closed baffle valve, usually used as a flow control valve and damping valve in water pipeline systems.
With the application of synthetic rubber for chemical corrosion prevention in butterfly valves, the performance of butterfly valves has been improved. Due to its characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, and low cost, synthetic rubber can be selected with different performance according to different usage requirements to meet the operating conditions of butterfly valves. Therefore, it is widely used in the manufacturing of lining and elastic valve seats for butterfly valves.
Due to the strong corrosion resistance, stable performance, low aging resistance, low friction coefficient, easy forming, and stable size of polytetrafluoroethylene (PTFE), and the ability to improve its comprehensive performance by filling and adding appropriate materials, a butterfly valve sealing material with better strength and lower friction coefficient can be obtained, overcoming some limitations of synthetic rubber. Therefore, polymer polymer materials represented by PTFE and their filling modified materials have been widely used in butterfly valves, further improving the performance of butterfly valves. A wider temperature and pressure range, longer sealing performance, and service life butterfly valves have emerged.
In order to meet the requirements of industrial applications such as high and low temperatures, strong erosion, and long service life, metal sealed butterfly valves have made great progress in the past decade. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high-strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperatures, strong erosion, and long service life, with the emergence of large diameter (9750mm) and high pressure (2.2kN/cm) ²)、 The butterfly valve with a wide temperature range (-102~606 ℃) has taken the technology of butterfly valves to a new level.
Due to the application of computer-aided design (CAD), computer-aided manufacturing (CAM), and flexible manufacturing systems (FMS) in the valve industry, the design and manufacturing of butterfly valves have reached a new level. Not only has it comprehensively innovated the design and calculation methods of valves, reduced the heavy and repetitive routine design work of professional technicians, and provided them with more energy to improve the technical performance of products and research and development of new products, shortening the cycle and increasing labor productivity. Especially in the field of metal sealed butterfly valves, due to the application of CAD/CAM, a three-dimensional sealing pair designed by CAD and manufactured by CAM CNC machining has emerged, which ensures that the sealing surface of the valve is free from any compression, abrasion, or wear during the opening and closing process, thereby improving the sealing performance and service life of the butterfly valve by an order of magnitude.
Butterfly valves have a small flow resistance when fully opened, and can perform sensitive flow control when opened between approximately 15 ° to 70 °. Therefore, butterfly valves are widely used in the field of large-diameter regulation and will gradually become the dominant valve type.
Due to the wiping nature of the butterfly valve plate, most butterfly valves can be used for media with suspended solid particles, and can also be used for powder and granular media depending on the strength of the sealing element.
Classification of Butterfly Valves:
1) Classified by structural type: center sealed butterfly valve, single eccentric sealed butterfly valve, double eccentric sealed butterfly valve, and triple eccentric sealed butterfly valve.
2) Classified by sealing surface material:
① Soft sealed butterfly valves have two types of sealing pairs: non-metallic soft materials for non-metallic soft materials and metallic hard materials for non-metallic soft materials.
② Metal hard sealed butterfly valve, its sealing pair is composed of metal hard material to metal hard material.
3) Classified by sealing form:
① Forced sealing butterfly valves are also divided into elastic sealing butterfly valves. The sealing pressure is generated by the compression of the valve seat by the valve plate when the valve is closed, resulting in the elasticity of the valve seat or valve plate; External torque sealing butterfly valve, the sealing pressure is generated by the torque applied to the valve shaft.
② Pressure filled sealing butterfly valve, the sealing specific pressure is generated by the pressure filling of the elastic sealing element on the valve seat or valve plate Automatic sealing butterfly valve, the sealing pressure is automatically generated by the medium pressure.
4) Classified by work pressure:
① Vacuum butterfly valve, a butterfly valve with a working pressure lower than standard atmospheric pressure.
② Low pressure butterfly valve, butterfly valve with nominal pressure ≤ PN16.
③ Medium pressure butterfly valve, a butterfly valve with a nominal pressure of PN25~PN63.
④ High pressure butterfly valve. Butterfly valves with nominal pressures ranging from PN100 to PN800.
5) Classified by working temperature:
① High temperature butterfly valve, butterfly valve with t>450 ℃.
② Medium temperature butterfly valve, butterfly valve with 120 ℃<t ≤ 450 ℃.
③ Butterfly valves at room temperature.
④ Low temperature butterfly valve, butterfly valve with -100 ℃<t<-29 ℃.
⑤ Ultra low temperature butterfly valve, butterfly valve with t ≤ -100 ℃.
6) According to the connection method, it is divided into clamp type butterfly valve, flange type butterfly valve, ear type butterfly valve, and welding type butterfly valve.
Applicable occasions for butterfly valves:
Butterfly valves are suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, which is about three times that of gate valves, when selecting a butterfly valve, the impact of pressure loss on the pipeline system should be fully considered, and the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closed should also be considered. In addition, it is necessary to consider the limitations of the working temperature that the elastic valve seat material can withstand at high temperatures.
The structural length and overall height of butterfly valves are small, with fast opening and closing speeds, and good fluid control characteristics. The structural principle of butterfly valves is most suitable for making large-diameter valves. When using butterfly valves for flow control, the most important thing is to choose the correct size and type of butterfly valve so that it can work properly and effectively. Usually, in throttling, regulating control, and mud media, short structural length and fast opening and closing speed (1/4r) are required. Low pressure cutoff (small pressure difference), it is recommended to use butterfly valves.
Butterfly valves can be used in channels with dual adjustment, contraction, low noise, cavitation and gasification phenomena, small leakage into the atmosphere, and corrosive media. When using butterfly valves under special operating conditions such as throttling adjustment, strict sealing requirements, severe wear, low temperature (deep cold), etc., special three eccentric or double eccentric butterfly valves with specially designed metal sealing belt adjustment devices need to be used.
The midline butterfly valve is suitable for fresh water, sewage, seawater, saline water, steam, natural gas, food, medicine, oil, and various acid-base and other pipelines that require complete sealing, zero gas leakage during gas testing, high service life requirements, and operating temperatures between -10~150 ℃.
Soft sealed eccentric butterfly valves are suitable for bi-directional opening and closing and adjustment of ventilation and dust removal pipelines, and are widely used in gas pipelines and waterways in metallurgical, light industry, power, petrochemical systems, etc. Metal to metal wire sealed double eccentric butterfly valves are suitable for urban heating, steam supply, water supply, gas, oil, acid-base and other pipelines as regulating and shut-off devices.
Metal to metal face sealed triple eccentric butterfly valves are not only used as program control valves for large pressure swing adsorption (PSA) gas separation devices, but also widely used in fields such as petroleum, petrochemical, chemical, metallurgical, and electric power. They are good substitutes for gate valves, globe valves, and so on.
Butterfly Valves Advantages:
Quick and easy operation with a simple quarter-turn mechanism.
Compact design, making them suitable for installations with space constraints.
Resilient seat materials provide a tight seal, minimizing the risk of leakage.
Suitable for both on/off and throttling applications.
Butterfly Valve Applications:
Wafer Concentric Line Resilient Butterfly Valves find applications in a variety of industries and fluid-handling systems where reliable flow control is essential. Here are some common application scenarios: HVAC Systems:Used in heating, ventilation, and air conditioning (HVAC) systems for regulating the flow of water, air, or other fluids.
Water Treatment Plants: Employed in water treatment facilities to control the flow of water, chemicals, or other liquids in different stages of the treatment process.
Chemical Processing: Suitable for use in chemical processing plants to control the flow of various chemicals and corrosive substances.
Power Generation: Found in power plants to regulate the flow of water or other fluids in cooling systems, boiler feedwater systems, and other processes.
Petrochemical Industry: Used in the petrochemical industry for controlling the flow of oil, gas, and various petrochemical products.
Food and Beverage Industry: Applied in food and beverage processing plants to regulate the flow of liquids, including water, juices, and other ingredients.
Wastewater Treatment: Found in wastewater treatment plants for managing the flow of wastewater and treatment chemicals.
Marine and Shipbuilding: Utilized in marine applications, such as shipbuilding, to control the flow of water and other fluids in piping systems.
Mining Industry: Used in mining operations for controlling the flow of water, slurry, and other fluids in mining processes.
General Industrial Applications: Applied in various industrial processes where fluid flow control is necessary, such as in manufacturing plants and factories.
Fire Protection Systems: Found in fire protection systems to regulate water flow in sprinkler systems and fire hydrants.
Oil and Gas Pipelines: Employed in oil and gas pipelines for flow control, especially in situations where a compact design and ease of installation are essential.
Pulp and Paper Industry: Used in pulp and paper mills for controlling the flow of water, chemicals, and pulp slurries.
Pharmaceutical Industry: Applied in pharmaceutical manufacturing for controlling the flow of liquids in production processes.
Mining Industry: Utilized in mining operations for controlling the flow of water, slurry, and other fluids in mining processes
Butterfly Valves Technical Details:
Materials: The valve body is typically made from materials like carbon steel (WCB), stainless steel (CF8, CF3), or other special alloys depending on the specific application requirements.
Size and Pressure Ratings: The valve comes in various sizes, ranging from 1" to 10".
Pressure ratings can vary, with common ranges being 150LB–600LB or PN10–PN64, indicating the maximum pressure the valve can handle.
Standards: The valve is designed and manufactured according to industry standards such as API 6D, API 608, ASME B16.34, ISO 17292, and BS5351.
Face-to-Face Dimensions: The face-to-face dimensions conform to standards like ASME B16.10, BS 558, BS12982, and ISO 5752.
Testing Standards: The valve undergoes testing according to API598, API 6D, BS12569 for pressure testing and API 6FA, API 607 for fire safety testing.
Operator Options: The valve can be operated manually using a handwheel or by using automated methods such as worm gears, electric actuators, pneumatic actuators, or hydraulic actuators.
Shut-off Class: It meets shut-off standards like API 598 (zero leakage) and API 6D.
