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HD-BVS012
HAIDE
848130
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Structural composition：
Butterfly valves are mainly composed of the following parts:
Valve body: It is the main body of a butterfly valve, usually a circular or elliptical structure, used to accommodate the butterfly plate and sealing components. The materials of valve bodies are diverse, commonly including cast iron, cast steel, stainless steel, etc. Choose the appropriate material according to different working conditions and media.
Butterfly plate: It is the core component of a butterfly valve, shaped like butterfly wings, usually a circular or elliptical thin plate, connected to the driving device through the valve stem. The rotation angle of the butterfly plate determines the opening of the valve, thereby controlling the flow rate of the fluid. The material of the butterfly plate is generally matched with the valve body material to ensure strength and corrosion resistance.
Valve stem: used to connect the butterfly plate and the driving device, transmit driving force, and enable the butterfly plate to rotate around the axis of the valve stem. The strength and stiffness of the valve stem are crucial for the performance of butterfly valves, and high-strength steel is usually used for manufacturing.
Sealing device: including sealing rings and gaskets, used to prevent fluid leakage. The sealing ring is generally installed on the edge of the butterfly plate or the sealing surface of the valve body. Common sealing materials include rubber, polytetrafluoroethylene (PTFE), etc. There are two types of sealing forms: soft sealing and hard sealing. Soft sealing is suitable for working conditions with lower pressure and temperature, and has better sealing performance; Hard sealing is suitable for high-temperature and high-pressure working conditions, usually using metal sealing surfaces.
Drive device: used to drive the rotation of the butterfly plate. Common drive methods include manual, electric, pneumatic, and hydraulic. The manual drive device is usually a handle or handwheel, which is easy to operate and suitable for small caliber butterfly valves or infrequent operations; Electric, pneumatic, and hydraulic drive devices are suitable for large-diameter butterfly valves or situations that require remote control, and can achieve fast switching and precise adjustment.
Working principle：
The working principle of butterfly valve is to control the flow of fluid by rotating the butterfly plate. When the butterfly plate rotates parallel to the valve body flow channel, the valve is fully open and fluid can freely pass through; When the butterfly plate rotates perpendicular to the valve body flow channel, the valve is fully closed and the fluid is completely cut off. The rotation angle of the butterfly plate is proportional to the opening of the valve, and controlling the fluid flow can be achieved by adjusting the rotation angle of the butterfly plate.
The fluid resistance of butterfly valves is relatively small. When the butterfly plate is fully open, the flow of fluid in the valve body is almost unobstructed, and the pressure loss is small. This is because the butterfly plate is basically parallel to the valve body flow channel when fully opened, and the fluid channel is unobstructed. When the butterfly valve is in a semi open state, fluid flows through the gap between the butterfly valve and the valve body, generating a certain resistance. However, compared to other valve types, the resistance of butterfly valves is still relatively small.
Advantages：
Simple structure: The butterfly valve has a relatively simple structure, mainly composed of a valve body, butterfly plate, valve stem, and sealing device, with a small number of components, making it easy to manufacture and maintain.
Small size and light weight: Compared with other valves of the same diameter, butterfly valves have a smaller volume and weight, are easy to install and transport, and are particularly suitable for large-diameter pipeline systems.
Easy to operate: The butterfly valve has a simple opening and closing operation, which can be achieved by simply rotating the butterfly plate. The operating torque is small, and manual operation is relatively effortless. In addition, butterfly valves can be equipped with electric, pneumatic, or hydraulic drive devices to achieve remote control and automated operation.
Good sealing performance: Butterfly valves come in various sealing forms. Soft sealed butterfly valves can achieve good sealing performance under low pressure, while hard sealed butterfly valves are suitable for high temperature and high pressure conditions, meeting the sealing requirements of different media and working conditions.
Good regulation performance: Butterfly valves can control fluid flow by adjusting the rotation angle of the butterfly plate, with a wide regulation range, suitable for situations that require precise flow regulation.
Wide applicability: Butterfly valves are suitable for various media, including water, steam, gas, oil, etc. They have a wide range of working pressure and temperature, and can meet the application needs of different industrial fields.
Disadvantages：
Relatively poor sealing reliability: Although the sealing performance of butterfly valves can meet the requirements to a certain extent, the sealing reliability may be affected under high pressure, high temperature, or highly corrosive working conditions. For example, in high-pressure steam systems, the sealing surface of butterfly valves may deform due to high temperature and pressure, leading to seal failure.
Limited adjustment accuracy: The adjustment accuracy of butterfly valves is relatively low compared to other valves (such as regulating valves), especially when approaching the fully open or fully closed position, the sensitivity of flow regulation is poor. This is because the relationship between the rotation angle of the butterfly valve and the flow rate is not non-linear, and the sealing structure of the butterfly valve has certain limitations on the accuracy of flow regulation.
Corrosion resistance is limited: The corrosion resistance of butterfly valves mainly depends on their materials and sealing materials. For some highly corrosive media, such as concentrated acid, concentrated alkali, etc., the material and sealing material of butterfly valves need to be specially selected, otherwise it may affect the service life and performance of the valve due to corrosion.
Not suitable for high-precision control applications: The structural characteristics of butterfly valves determine that they have certain limitations in high-precision flow control and pressure control, and are usually not suitable for applications that require extremely high control accuracy, such as key process control in industries such as fine chemicals and pharmaceuticals.
Key selection points：
Medium characteristics: Select appropriate butterfly valve materials and sealing materials based on the properties of the conveying medium, such as temperature, pressure, corrosiveness, abrasion, etc. For example, for high-temperature media, high-temperature resistant valve body materials and sealing materials should be selected; For corrosive media, corrosion-resistant materials such as stainless steel, alloy steel, etc. should be selected.
Working pressure and temperature: Select the nominal pressure and working temperature range of the butterfly valve according to the pressure and temperature requirements of the pipeline system. The nominal pressure of butterfly valves usually comes in various specifications such as 0.6MPa, 1.0MPa, 1.6MPa, etc., and the working temperature range varies from room temperature to high temperature (such as above 300 ℃).
Diameter size: Select the appropriate butterfly valve diameter based on the flow requirements of the pipeline system and the diameter of the pipeline. The diameter range of butterfly valves is wide, from DN50 to DN3000 or even larger. The diameter of butterfly valves should be determined based on actual flow rate and velocity calculations.
Drive mode: Select the appropriate drive mode based on operating frequency, control requirements, and installation environment. Manual drive is suitable for small diameter butterfly valves or situations where operation is infrequent; Electric, pneumatic, and hydraulic drives are suitable for large-diameter butterfly valves or applications that require remote control.
Sealing requirements: Choose soft seal or hard seal butterfly valves based on the sealing performance requirements of the working conditions. Soft sealed butterfly valves are suitable for working conditions with low pressure, room temperature, and clean media, and have good sealing performance; Hard sealed butterfly valves are suitable for working conditions with high temperature, high pressure, and particulate media, and their sealing performance is relatively stable.
Installation method: The installation methods of butterfly valves include clamp type, flange type, and welding type. The clamp type butterfly valve is easy to install and suitable for medium and small diameter pipelines; The flange butterfly valve is securely installed and suitable for large-diameter pipelines; Welded butterfly valves are suitable for piping systems that do not allow disassembly.
Key selection points
Medium characteristics: Select appropriate butterfly valve materials and sealing materials based on the properties of the conveying medium, such as temperature, pressure, corrosiveness, abrasion, etc. For example, for high-temperature media, high-temperature resistant valve body materials and sealing materials should be selected; For corrosive media, corrosion-resistant materials such as stainless steel, alloy steel, etc. should be selected.
Working pressure and temperature: Select the nominal pressure and working temperature range of the butterfly valve according to the pressure and temperature requirements of the pipeline system. The nominal pressure of butterfly valves usually comes in various specifications such as 0.6MPa, 1.0MPa, 1.6MPa, etc., and the working temperature range varies from room temperature to high temperature (such as above 300 ℃).
Diameter size: Select the appropriate butterfly valve diameter based on the flow requirements of the pipeline system and the diameter of the pipeline. The diameter range of butterfly valves is wide, from DN50 to DN3000 or even larger. The diameter of butterfly valves should be determined based on actual flow rate and velocity calculations.
Drive mode: Select the appropriate drive mode based on operating frequency, control requirements, and installation environment. Manual drive is suitable for small diameter butterfly valves or situations where operation is infrequent; Electric, pneumatic, and hydraulic drives are suitable for large-diameter butterfly valves or applications that require remote control.
Sealing requirements: Choose soft seal or hard seal butterfly valves based on the sealing performance requirements of the working conditions. Soft sealed butterfly valves are suitable for working conditions with low pressure, room temperature, and clean media, and have good sealing performance; Hard sealed butterfly valves are suitable for working conditions with high temperature, high pressure, and particulate media, and their sealing performance is relatively stable.
Installation method: The installation methods of butterfly valves include clamp type, flange type, and welding type. The clamp type butterfly valve is easy to install and suitable for medium and small diameter pipelines; The flange butterfly valve is securely installed and suitable for large-diameter pipelines; Welded butterfly valves are suitable for piping systems that do not allow disassembly.
Structural composition：
Butterfly valves are mainly composed of the following parts:
Valve body: It is the main body of a butterfly valve, usually a circular or elliptical structure, used to accommodate the butterfly plate and sealing components. The materials of valve bodies are diverse, commonly including cast iron, cast steel, stainless steel, etc. Choose the appropriate material according to different working conditions and media.
Butterfly plate: It is the core component of a butterfly valve, shaped like butterfly wings, usually a circular or elliptical thin plate, connected to the driving device through the valve stem. The rotation angle of the butterfly plate determines the opening of the valve, thereby controlling the flow rate of the fluid. The material of the butterfly plate is generally matched with the valve body material to ensure strength and corrosion resistance.
Valve stem: used to connect the butterfly plate and the driving device, transmit driving force, and enable the butterfly plate to rotate around the axis of the valve stem. The strength and stiffness of the valve stem are crucial for the performance of butterfly valves, and high-strength steel is usually used for manufacturing.
Sealing device: including sealing rings and gaskets, used to prevent fluid leakage. The sealing ring is generally installed on the edge of the butterfly plate or the sealing surface of the valve body. Common sealing materials include rubber, polytetrafluoroethylene (PTFE), etc. There are two types of sealing forms: soft sealing and hard sealing. Soft sealing is suitable for working conditions with lower pressure and temperature, and has better sealing performance; Hard sealing is suitable for high-temperature and high-pressure working conditions, usually using metal sealing surfaces.
Drive device: used to drive the rotation of the butterfly plate. Common drive methods include manual, electric, pneumatic, and hydraulic. The manual drive device is usually a handle or handwheel, which is easy to operate and suitable for small caliber butterfly valves or infrequent operations; Electric, pneumatic, and hydraulic drive devices are suitable for large-diameter butterfly valves or situations that require remote control, and can achieve fast switching and precise adjustment.
Working principle：
The working principle of butterfly valve is to control the flow of fluid by rotating the butterfly plate. When the butterfly plate rotates parallel to the valve body flow channel, the valve is fully open and fluid can freely pass through; When the butterfly plate rotates perpendicular to the valve body flow channel, the valve is fully closed and the fluid is completely cut off. The rotation angle of the butterfly plate is proportional to the opening of the valve, and controlling the fluid flow can be achieved by adjusting the rotation angle of the butterfly plate.
The fluid resistance of butterfly valves is relatively small. When the butterfly plate is fully open, the flow of fluid in the valve body is almost unobstructed, and the pressure loss is small. This is because the butterfly plate is basically parallel to the valve body flow channel when fully opened, and the fluid channel is unobstructed. When the butterfly valve is in a semi open state, fluid flows through the gap between the butterfly valve and the valve body, generating a certain resistance. However, compared to other valve types, the resistance of butterfly valves is still relatively small.
Advantages：
Simple structure: The butterfly valve has a relatively simple structure, mainly composed of a valve body, butterfly plate, valve stem, and sealing device, with a small number of components, making it easy to manufacture and maintain.
Small size and light weight: Compared with other valves of the same diameter, butterfly valves have a smaller volume and weight, are easy to install and transport, and are particularly suitable for large-diameter pipeline systems.
Easy to operate: The butterfly valve has a simple opening and closing operation, which can be achieved by simply rotating the butterfly plate. The operating torque is small, and manual operation is relatively effortless. In addition, butterfly valves can be equipped with electric, pneumatic, or hydraulic drive devices to achieve remote control and automated operation.
Good sealing performance: Butterfly valves come in various sealing forms. Soft sealed butterfly valves can achieve good sealing performance under low pressure, while hard sealed butterfly valves are suitable for high temperature and high pressure conditions, meeting the sealing requirements of different media and working conditions.
Good regulation performance: Butterfly valves can control fluid flow by adjusting the rotation angle of the butterfly plate, with a wide regulation range, suitable for situations that require precise flow regulation.
Wide applicability: Butterfly valves are suitable for various media, including water, steam, gas, oil, etc. They have a wide range of working pressure and temperature, and can meet the application needs of different industrial fields.
Disadvantages：
Relatively poor sealing reliability: Although the sealing performance of butterfly valves can meet the requirements to a certain extent, the sealing reliability may be affected under high pressure, high temperature, or highly corrosive working conditions. For example, in high-pressure steam systems, the sealing surface of butterfly valves may deform due to high temperature and pressure, leading to seal failure.
Limited adjustment accuracy: The adjustment accuracy of butterfly valves is relatively low compared to other valves (such as regulating valves), especially when approaching the fully open or fully closed position, the sensitivity of flow regulation is poor. This is because the relationship between the rotation angle of the butterfly valve and the flow rate is not non-linear, and the sealing structure of the butterfly valve has certain limitations on the accuracy of flow regulation.
Corrosion resistance is limited: The corrosion resistance of butterfly valves mainly depends on their materials and sealing materials. For some highly corrosive media, such as concentrated acid, concentrated alkali, etc., the material and sealing material of butterfly valves need to be specially selected, otherwise it may affect the service life and performance of the valve due to corrosion.
Not suitable for high-precision control applications: The structural characteristics of butterfly valves determine that they have certain limitations in high-precision flow control and pressure control, and are usually not suitable for applications that require extremely high control accuracy, such as key process control in industries such as fine chemicals and pharmaceuticals.
Key selection points：
Medium characteristics: Select appropriate butterfly valve materials and sealing materials based on the properties of the conveying medium, such as temperature, pressure, corrosiveness, abrasion, etc. For example, for high-temperature media, high-temperature resistant valve body materials and sealing materials should be selected; For corrosive media, corrosion-resistant materials such as stainless steel, alloy steel, etc. should be selected.
Working pressure and temperature: Select the nominal pressure and working temperature range of the butterfly valve according to the pressure and temperature requirements of the pipeline system. The nominal pressure of butterfly valves usually comes in various specifications such as 0.6MPa, 1.0MPa, 1.6MPa, etc., and the working temperature range varies from room temperature to high temperature (such as above 300 ℃).
Diameter size: Select the appropriate butterfly valve diameter based on the flow requirements of the pipeline system and the diameter of the pipeline. The diameter range of butterfly valves is wide, from DN50 to DN3000 or even larger. The diameter of butterfly valves should be determined based on actual flow rate and velocity calculations.
Drive mode: Select the appropriate drive mode based on operating frequency, control requirements, and installation environment. Manual drive is suitable for small diameter butterfly valves or situations where operation is infrequent; Electric, pneumatic, and hydraulic drives are suitable for large-diameter butterfly valves or applications that require remote control.
Sealing requirements: Choose soft seal or hard seal butterfly valves based on the sealing performance requirements of the working conditions. Soft sealed butterfly valves are suitable for working conditions with low pressure, room temperature, and clean media, and have good sealing performance; Hard sealed butterfly valves are suitable for working conditions with high temperature, high pressure, and particulate media, and their sealing performance is relatively stable.
Installation method: The installation methods of butterfly valves include clamp type, flange type, and welding type. The clamp type butterfly valve is easy to install and suitable for medium and small diameter pipelines; The flange butterfly valve is securely installed and suitable for large-diameter pipelines; Welded butterfly valves are suitable for piping systems that do not allow disassembly.
Key selection points
Medium characteristics: Select appropriate butterfly valve materials and sealing materials based on the properties of the conveying medium, such as temperature, pressure, corrosiveness, abrasion, etc. For example, for high-temperature media, high-temperature resistant valve body materials and sealing materials should be selected; For corrosive media, corrosion-resistant materials such as stainless steel, alloy steel, etc. should be selected.
Working pressure and temperature: Select the nominal pressure and working temperature range of the butterfly valve according to the pressure and temperature requirements of the pipeline system. The nominal pressure of butterfly valves usually comes in various specifications such as 0.6MPa, 1.0MPa, 1.6MPa, etc., and the working temperature range varies from room temperature to high temperature (such as above 300 ℃).
Diameter size: Select the appropriate butterfly valve diameter based on the flow requirements of the pipeline system and the diameter of the pipeline. The diameter range of butterfly valves is wide, from DN50 to DN3000 or even larger. The diameter of butterfly valves should be determined based on actual flow rate and velocity calculations.
Drive mode: Select the appropriate drive mode based on operating frequency, control requirements, and installation environment. Manual drive is suitable for small diameter butterfly valves or situations where operation is infrequent; Electric, pneumatic, and hydraulic drives are suitable for large-diameter butterfly valves or applications that require remote control.
Sealing requirements: Choose soft seal or hard seal butterfly valves based on the sealing performance requirements of the working conditions. Soft sealed butterfly valves are suitable for working conditions with low pressure, room temperature, and clean media, and have good sealing performance; Hard sealed butterfly valves are suitable for working conditions with high temperature, high pressure, and particulate media, and their sealing performance is relatively stable.
Installation method: The installation methods of butterfly valves include clamp type, flange type, and welding type. The clamp type butterfly valve is easy to install and suitable for medium and small diameter pipelines; The flange butterfly valve is securely installed and suitable for large-diameter pipelines; Welded butterfly valves are suitable for piping systems that do not allow disassembly.
