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Under what circumstances should we choose a triple eccentric hard seal butterfly valve?
2024-09-19
What is a DN900 pneumatic triple eccentric hard seal butterfly valve?
The triple eccentric hard seal butterfly valve is an industrial valve whose key features lie in the "triple eccentric" design in the structure and the hard seal material used. Compared with traditional soft-sealed butterfly valves, the sealing surface material of hard-sealed butterfly valves is usually metal or carbide, which makes them perform well in harsh working conditions such as high temperature, high pressure, and strong corrosion. The triple eccentric design effectively reduces the wear of the sealing surface when the valve is opened and closed, thereby extending the service life of the valve.
The triple eccentric hard seal butterfly valve is an industrial valve whose key features lie in the "triple eccentric" design in the structure and the hard seal material used. Compared with traditional soft-sealed butterfly valves, the sealing surface material of hard-sealed butterfly valves is usually metal or carbide, which makes them perform well in harsh working conditions such as high temperature, high pressure, and strong corrosion. The triple eccentric design effectively reduces the wear of the sealing surface when the valve is opened and closed, thereby extending the service life of the valve.
What is the structural principle of the triple eccentric butterfly valve?
The design of the triple eccentric butterfly valve realizes the opening and sealing of the valve through three eccentric positions. These three eccentricities include:
First eccentricity:
The axis of the valve stem deviates from the center of the valve sealing surface, so that when the valve plate rotates, the sealing surface will not directly contact the valve seat, reducing friction.
The axis of the valve stem deviates from the center of the valve sealing surface, so that when the valve plate rotates, the sealing surface will not directly contact the valve seat, reducing friction.
Second eccentricity:
The valve stem axis deviates from the centerline of the pipe, further reducing the relative movement of the sealing surface during the opening and closing processes.
The valve stem axis deviates from the centerline of the pipe, further reducing the relative movement of the sealing surface during the opening and closing processes.
Third eccentricity:
The centerline of the valve plate sealing surface and the valve seat sealing surface deviate conically. This design ensures that when the valve is close to the closed state, the sealing surface can contact the valve seat smoothly to achieve friction-free sealing. This design not only reduces the wear between the sealing surfaces, but also increases the service life of the valve.
The centerline of the valve plate sealing surface and the valve seat sealing surface deviate conically. This design ensures that when the valve is close to the closed state, the sealing surface can contact the valve seat smoothly to achieve friction-free sealing. This design not only reduces the wear between the sealing surfaces, but also increases the service life of the valve.
The main advantage of this structure is that when the valve is closed, the contact between the sealing pairs is gentle and will not cause scratches and wear. When it is completely closed, the triple eccentric structure can ensure the self-locking function of the valve and ensure that the medium does not Will leak.
What is the main difference between triple eccentric butterfly valve and double eccentric butterfly valve?
Both double-eccentric butterfly valves and triple-eccentric butterfly valves are widely used in industrial applications, but there are some important differences in the structural design between the two:
The eccentric design is different:
The double eccentric butterfly valve has only two eccentric points, which are the valve stem deviating from the center of the valve plate and the valve stem deviating from the center of the pipe. This causes slight contact between the valve plate and the sealing surface when the valve is opened, causing wear. The triple-eccentric butterfly valve has an additional tapered eccentric point, which further reduces friction when the valve is opened and improves sealing performance.
The double eccentric butterfly valve has only two eccentric points, which are the valve stem deviating from the center of the valve plate and the valve stem deviating from the center of the pipe. This causes slight contact between the valve plate and the sealing surface when the valve is opened, causing wear. The triple-eccentric butterfly valve has an additional tapered eccentric point, which further reduces friction when the valve is opened and improves sealing performance.
Difference in sealing performance:
Since the triple eccentric design can provide friction-free sealing when closing, the sealing performance of the triple eccentric butterfly valve is significantly better than that of the double eccentric butterfly valve. When double-eccentric butterfly valves are frequently switched on and off, the sealing surface is prone to wear, while triple-eccentric butterfly valves effectively avoid this problem and are suitable for more demanding working conditions.
Since the triple eccentric design can provide friction-free sealing when closing, the sealing performance of the triple eccentric butterfly valve is significantly better than that of the double eccentric butterfly valve. When double-eccentric butterfly valves are frequently switched on and off, the sealing surface is prone to wear, while triple-eccentric butterfly valves effectively avoid this problem and are suitable for more demanding working conditions.
Differences in durability and application scenarios:
Double eccentric butterfly valves are more suitable for fluid control under normal temperature and pressure, while triple eccentric butterfly valves can maintain excellent sealing in high temperature, high pressure, and highly corrosive situations, and are suitable for high-pressure steam systems. , chemical equipment and other complex working conditions.
What are the characteristics and biggest advantages of triple eccentric hard seal butterfly valve?
Triple eccentric hard seal butterfly valve has shown many advantages in the industrial field with its unique design and hard material.
Here are its main features and biggest advantages:
Here are its main features and biggest advantages:
Friction-free seal:
Thanks to the triple-eccentric design, the triple-eccentric butterfly valve has almost no friction when opening and closing. This not only extends the life of the sealing surface, but also improves the sealing performance of the valve and avoids common seal failure problems.
Thanks to the triple-eccentric design, the triple-eccentric butterfly valve has almost no friction when opening and closing. This not only extends the life of the sealing surface, but also improves the sealing performance of the valve and avoids common seal failure problems.
High temperature and high pressure resistance:
The sealing material of hard-sealed butterfly valves is usually metal or carbide, which allows it to withstand extreme high temperature and high pressure environments. In contrast, soft-sealed butterfly valves may fail due to aging or deformation of the sealing material at high temperatures, while hard-sealed butterfly valves can continue to work stably under harsh conditions.
The sealing material of hard-sealed butterfly valves is usually metal or carbide, which allows it to withstand extreme high temperature and high pressure environments. In contrast, soft-sealed butterfly valves may fail due to aging or deformation of the sealing material at high temperatures, while hard-sealed butterfly valves can continue to work stably under harsh conditions.
Strong corrosion resistance:
Since the sealing material of the triple eccentric butterfly valve can be corrosion-resistant metal or alloy, it is suitable for handling corrosive media, such as acids, alkalis and other chemical substances. Compared with soft-sealing butterfly valves, it is more durable in corrosive media.
Since the sealing material of the triple eccentric butterfly valve can be corrosion-resistant metal or alloy, it is suitable for handling corrosive media, such as acids, alkalis and other chemical substances. Compared with soft-sealing butterfly valves, it is more durable in corrosive media.
Long service life:
The triple eccentric butterfly valve will not fail due to wear when sealing, so it can still maintain a long service life even under frequent opening and closing operations. This is especially important for systems requiring high frequency operation.
The triple eccentric butterfly valve will not fail due to wear when sealing, so it can still maintain a long service life even under frequent opening and closing operations. This is especially important for systems requiring high frequency operation.
High sealing reliability:
The triple eccentric design allows the sealing surfaces of the butterfly plate to automatically come together when closing, achieving a self-locking function and ensuring no leakage of media. This design greatly improves the sealing reliability of the valve and is especially suitable for working conditions requiring zero leakage.
The triple eccentric design allows the sealing surfaces of the butterfly plate to automatically come together when closing, achieving a self-locking function and ensuring no leakage of media. This design greatly improves the sealing reliability of the valve and is especially suitable for working conditions requiring zero leakage.
There are many commonly used driving methods for triple eccentric butterfly valves, and the specific selection depends on the needs and working conditions of the application scenario.
The following are several common driving methods:
The following are several common driving methods:
1. Manual drive
Manual drive is the most basic drive method, usually operating the valve switch through a handwheel or handle. This method is suitable for smaller diameter butterfly valves or low-frequency operation conditions.
Manual drive is the most basic drive method, usually operating the valve switch through a handwheel or handle. This method is suitable for smaller diameter butterfly valves or low-frequency operation conditions.
Advantage:
- Simple structure and easy operation
- Suitable for occasions where frequent operations are not required or safety requirements are not high
- No external power required, saving costs
Shortcoming:
- Laborious operation, especially for large diameter, high pressure butterfly valves
- Manual operation is slow and not suitable for emergency control
2. Electric drive
Electrically driven butterfly valves use a motor to control the opening and closing of the valve, enabling remote automatic control. Usually equipped with an electric actuator to accurately adjust the opening of the valve.
Electrically driven butterfly valves use a motor to control the opening and closing of the valve, enabling remote automatic control. Usually equipped with an electric actuator to accurately adjust the opening of the valve.
Advantage:
- Suitable for remote operation and high degree of automation
- High operating precision, enabling precise adjustment
- Suitable for working conditions that require frequent opening and closing, such as petroleum, chemical industry, metallurgy and other industries
Shortcoming:
- Power supply support is required. If the power supply is unstable, it may affect the valve operation.
- The cost is relatively high, especially large-diameter butterfly valves require more powerful actuators
3. Pneumatic drive
Pneumatic drive relies on compressed air as the power source to control the opening and closing of the valve through a pneumatic actuator. This driving method is widely used in situations requiring quick response and frequent operations.
Pneumatic drive relies on compressed air as the power source to control the opening and closing of the valve through a pneumatic actuator. This driving method is widely used in situations requiring quick response and frequent operations.
Advantage:
- Fast operation and short response time
- Suitable for explosion-proof situations because no electrical sparks are generated
- Easy to maintain, relatively simple structure
Shortcoming:
- Requires stable air supply
- For large diameter valves, the pneumatic actuator is large and the cost increases
4. Hydraulic drive
Hydraulic drive uses hydraulic oil as the power source, and the hydraulic actuator can provide powerful power and is suitable for butterfly valve control in ultra-large diameter and high-pressure pipeline systems.
Hydraulic drive uses hydraulic oil as the power source, and the hydraulic actuator can provide powerful power and is suitable for butterfly valve control in ultra-large diameter and high-pressure pipeline systems.
Advantage:
- Provides greater torque, suitable for large diameter butterfly valves
- Smooth operation, especially suitable for high-pressure working conditions
- Remote control and automated operation can be achieved
Shortcoming:
- The hydraulic system is complex and requires regular maintenance
- Hydraulic oil leakage may cause contamination
5. Electro-hydraulic linkage drive
Electro-hydraulic drive combines the advantages of electric and hydraulic drives and is usually used in situations where high precision and large torque are required. Electric signals control the hydraulic system for efficient and precise valve operation.
Electro-hydraulic drive combines the advantages of electric and hydraulic drives and is usually used in situations where high precision and large torque are required. Electric signals control the hydraulic system for efficient and precise valve operation.
Advantage:
- Suitable for super large diameter and high pressure working conditions
- High operating precision and able to withstand greater pressure and load
- High reliability, suitable for demanding industrial situations
Shortcoming:
- High cost and complex system
- Maintenance is relatively difficult
The driving mode of the triple eccentric butterfly valve is selected according to different working requirements and working conditions. Manual drive is suitable for small and low-frequency operation situations, electric and pneumatic drives are more suitable for working conditions with high automation requirements, and hydraulic and electro-hydraulic linkage are suitable for large diameter and high-pressure environments.
Due to its excellent sealing performance, high temperature resistance, corrosion resistance and long life, triple eccentric hard seal butterfly valve is suitable for various extreme and harsh industrial conditions. Specific application conditions include but are not limited to:
High temperature and high pressure environment:
Triple eccentric hard seal butterfly valve can withstand high temperatures up to hundreds of degrees Celsius, and is suitable for high-pressure pipeline systems, such as steam pipelines and boiler systems in power plants.
Triple eccentric hard seal butterfly valve can withstand high temperatures up to hundreds of degrees Celsius, and is suitable for high-pressure pipeline systems, such as steam pipelines and boiler systems in power plants.
Corrosive medium transportation:
In the chemical and petrochemical industries, the medium may be highly corrosive. The triple-eccentric hard-seal butterfly valve can use corrosion-resistant metal sealing materials to ensure that it will not fail after long-term use. It is often used in acid, alkali and salt solution transportation pipelines.
In the chemical and petrochemical industries, the medium may be highly corrosive. The triple-eccentric hard-seal butterfly valve can use corrosion-resistant metal sealing materials to ensure that it will not fail after long-term use. It is often used in acid, alkali and salt solution transportation pipelines.
Occasions to prevent medium backflow:
Due to its zero leakage characteristics, triple eccentric hard-seal butterfly valves are often used in systems that require the medium to not flow back, such as oil and natural gas transmission pipelines.
Due to its zero leakage characteristics, triple eccentric hard-seal butterfly valves are often used in systems that require the medium to not flow back, such as oil and natural gas transmission pipelines.
High-frequency opening and closing operations:
In situations where frequent opening and closing is required, such as emission control in sewage treatment systems, the triple-eccentric hard-seal butterfly valve can greatly reduce maintenance frequency and costs with its long life and anti-wear performance.
In situations where frequent opening and closing is required, such as emission control in sewage treatment systems, the triple-eccentric hard-seal butterfly valve can greatly reduce maintenance frequency and costs with its long life and anti-wear performance.
Harsh hydraulic conditions:
Triple eccentric hard-seal butterfly valves can also provide reliable sealing effects when handling high-speed fluids or fluids with particles, so they are widely used in hydraulic regulating equipment in water conservancy projects.
Triple eccentric hard-seal butterfly valves can also provide reliable sealing effects when handling high-speed fluids or fluids with particles, so they are widely used in hydraulic regulating equipment in water conservancy projects.
Triple-eccentric hard-seal butterfly valve has become one of the indispensable key equipment in modern industry with its unique structural design and excellent durability. It solves many common sealing problems, especially in complex working conditions of high temperature, high pressure, and strong corrosiveness, showing excellent performance and reliability.
Compared with traditional double-eccentric butterfly valves, triple-eccentric hard-seal butterfly valves have better sealing performance, longer service life, and a wider range of applications. Whether in the energy, chemical or water treatment industries, triple eccentric hard-seal butterfly valves have become the equipment of choice for many companies due to their excellent performance.
