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Structural Analysis of Ultra-low temperature top-mounted fixed ball valve products

Structural Analysis of Ultra-low temperature top-mounted fixed ball valve products

(Summary description)In order to avoid the influence of the alternating temperature stress of the pipeline on the sealing of the ball valve, top entry fixed ball valves are commonly used. Ultra-low temperature top-mounted fixed ball valve products include four types

Structural Analysis of Ultra-low temperature top-mounted fixed ball valve products

(Summary description)In order to avoid the influence of the alternating temperature stress of the pipeline on the sealing of the ball valve, top entry fixed ball valves are commonly used. Ultra-low temperature top-mounted fixed ball valve products include four types

Information

In order to avoid the influence of the alternating temperature stress of the pipeline on the sealing of the ball valve, top entry fixed ball valves are commonly used. Ultra-low temperature top-mounted fixed ball valve products include four types: external adjustment rod top-mounted fixed ball valve, built-in adjustment rod top-mounted fixed ball valve, threaded seat top-mounted fixed ball valve, thread guide sleeve structure bellows seal top-mounted fixed ball valve four types .

Ultra-low temperature top-mounted fixed ball valve products

1. Ultra-low temperature top-mounted fixed ball valve products

The valve seat of Ultra-low temperature top-mounted fixed ball valve products is equipped with 2 to 4 external horizontal adjustment rods, and the assembly of the valve is realized by adjusting the displacement of the valve seat. This structure increases the external leakage point of the valve, so that the valve has a potential external leakage risk.

2. Top-mounted fixed ball valve with built-in adjustment rod

Each valve seat of Ultra-low temperature top-mounted fixed ball valve products relies on two built-in vertical adjustment rods to adjust the displacement of the valve seat to realize the assembly of the valve. This structure reduces the potential external leakage points of the valve. Due to the influence of factors such as the length of the structure and the size and material of the adjusting rod, this structure can only be applied to small-diameter (≤NPS6) top-entry ball valves.

3. Top entry trunnion ball valve with threaded seat

The threaded seat Ultra-low temperature top-mounted fixed ball valve products have radial threads at the front end of the seat, and the valve seat is adjusted by screwing the threaded adjustment ring to realize the assembly of the valve. This structure also avoids the potential risk of external leakage, but due to factors such as thread processing accuracy and long-term service thread failure, although this structure is commonly used in various LNG receiving stations, its potential failure mode is inevitable.

4. Thread guide sleeve structure Bellows seal Ultra-low temperature top-mounted fixed ball valve products

The lip-seal sealing ring is used between the valve body and the valve seat of the external adjustment rod, internal adjustment rod and threaded seat top entry trunnion ball valve. The sealing ring has high requirements for matching dimensional accuracy and surface roughness. Under such circumstances, there are many uncertain factors, and the valve will produce internal leakage. The bellows sealed top entry trunnion ball valve (Figure 4) solves the limitations, unreliability and internal leakage of the top entry structure. The bellows sealed top entry trunnion ball valve adopts the thread guide sleeve structure. One end of the bellows is welded to the valve seat, and the other end is welded to the threaded guide sleeve of the valve seat. The end surface of the guide sleeve is provided with threaded holes, and the valve seat flange is provided with light holes. The displacement of the valve seat is adjusted by 2 to 3 hexagon socket screws, so that the ball can be loaded from above. Ultra-low temperature top-mounted fixed ball valve products.

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