The external threaded kazari seal is a type of forced sealing mechanism. Instead of using a large-diameter main bolt, it employs a threaded sleeve, resulting in a more compact and efficient design. The top cover and the cylinder end are connected via a long sleeve with upper and lower zigzag threads. This sleeve is responsible for transmitting the axial force generated by internal pressure on the top cover. A primary seal is achieved by pressing triangular spacers against pre-tightened bolts through a pressure ring. Additionally, the threaded sleeve and the top cover feature six intermittent 30° concave grooves, allowing the assembly to be completed by rotating just 30°, which simplifies both installation and removal. However, this process requires special tools. One major drawback is that as the container diameter increases, the weight of the sleeve and top cover becomes significantly heavier, making handling more difficult.
In contrast, D-bolt high-pressure seals use C-rings or O-rings for sealing. The top cover is positioned into the cylinder end, and the connection is made using a D-shaped bolt—only one-quarter of a screw hole is formed in each piece. This design provides structural support along the longitudinal axis of the D-bolt, offering a larger effective bearing area. As a result, the D-bolt primarily experiences shear forces rather than tensile stress. The top cover and cylinder end can be assembled or disassembled by rotating the D-bolt 90°, and the bolt remains fixed to either the top cover or the flange, enhancing convenience. Moreover, the D-bolt design helps prevent thread galling that often occurs during traditional bolt assembly and disassembly. Overall, this system offers a reliable and user-friendly alternative to conventional threaded seals.
Electromagnetic Cold Or Heat Flowmeter
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