Description
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.
Triple-eccentric butterfly valves are widely used in petroleum, chemical, energy, metallurgy and other industries. Their structure and design allow them to maintain excellent sealing and stability in extreme environments. Triple eccentric butterfly valves are usually used in situations where reliable sealing and durability are required, such as high temperature and high pressure steam pipelines, corrosive media transportation and other fields.
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.
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.
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 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.
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.
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:
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.
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.
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.
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.
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.
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