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The latest modal bolt pressure sealing structure
The D-bolt C-ring high-pressure sealing system represents an advanced design compared to the traditional D-bolt O-ring and double-cone sealing structures. The double-cone structure, while simple in design, involves machining processes such as vertical turning, drilling, and tapping, which are relatively straightforward but require moderate precision. However, when it comes to threading the threaded sleeve or the external plug’s top cover, higher precision is needed, especially for large-sized inserts and thick-diameter sawtooth threads, which can be challenging to manufacture. In contrast, the D-bolt seal structure simplifies the process: by aligning the screw holes of the top cover and the cylinder end in one setup, both drilling and tapping can be completed efficiently. Additionally, the D-bolt itself is easy to produce, while the C-ring or O-ring seals demand higher machining accuracy.
Sealing reliability is enhanced through a self-tightening mechanism that utilizes internal pressure. In the case of the double-cone structure, a longitudinal groove is milled into the top cover’s cylindrical surface. During pre-tightening, the main bolt presses the double-cone ring against the top cover, creating an initial seal. Once in operation, the medium pressure enters the gap between the double-cone ring and the top cover, causing radial expansion and further tightening the seal. However, if leakage occurs during operation, simply tightening the bolts is no longer effective.
In comparison, the Kazari seal relies on a pre-tightening bolt that compresses a pressure ring against the gasket, ensuring a tight seal between the top cover and the cylinder end. If the pre-tightening bolt loosens or leakage occurs, the user can re-tighten the bolts to restore the seal, making this method more flexible and reliable in dynamic conditions.
The D-bolt high-pressure sealing system employs an elastic wire contact gasket, such as a C-ring, which achieves initial sealing through pre-tightening screws. This allows for independent adjustment of the pre-tightening force. As an example, a high-pressure container with an inner diameter of 500 mm, a design pressure of 15 MPa, and made from 16Mn forging material was analyzed to compare the structural dimensions and weight of different sealing systems.
In conclusion, the D-bolt high-pressure sealing structure offers several key advantages. First, it enables quick assembly and disassembly using ordinary tools at a 90-degree angle, making maintenance more efficient. Second, it significantly reduces the overall weight—by up to 46.2% compared to the double-cone structure and 54.6% compared to the Kazari structure. This weight reduction becomes even more pronounced in larger containers. Third, the seal is highly reliable, utilizing line-contact self-tightening through C-rings or similar components. The pre-tightening can be adjusted, and the self-tightening effect becomes more pronounced under increased internal pressure, ensuring long-term performance and safety.