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The Structure and Characteristics of Bellows Globe Valve

Release time:

Jul 21,2024

the bellows globe valve provides high sealing performance and longer service life, especially suitable for industrial environments with stringent requirements for sealing and harsh media conditions. It shows significant advantages in preventing media leakage, simplifying maintenance work, and adapting to a variety of working conditions, and is one of the preferred valves in the field of modern industrial fluid control.

Overview：Bellows globe valve is also called bellows sealed globe valve, the bellows lower end is automatically roll-welded to the stem assembly, and the upper end is automatically roll-welded to the connecting plate, which forms a metal barrier between the fluid medium and the atmosphere to ensure zero leakage of the stem. The sealing surfaces of the valve flap and the valve body are precision ground to achieve zero leakage in all cases. As an auxiliary seal, the stuffing box is still retained above the bellows to increase reliability and safety.

Structure: Bellows globe valve internal procurement bellows structure, stainless steel bellows lower end welded to the valve shaft to prevent process fluid erosion of the valve shaft. The other end is placed between the valve body and the valve shaft to form a static seal. Using a double seal design, if the bellows fails, the stem packing will also avoid leakage. The bellows is welded to the stem to maintain stable operation and avoid stem vibration caused by valve plug vibration. Suitable for pipelines with steam, flammable, explosive and toxic media.

Bellows globe valves have the following advantages over traditional globe valves:

1. Two-way sealing design scheme (bellows + packing) If the bellows is not effective, the stem packing can also be sealed.

2. Reasonable construction, reliable sealing, good performance, beautiful and generous modelling design.

4. The sealing surface is spray-welded with Co-based cemented carbide, which is wear-resistant, corrosion-resistant, good friction-resistant, durable, reduces the frequency of overhauling, and reduces the operation cost.

5. The bellows seal design scheme isolates the valve shaft from contact with the medium, ensuring zero leakage of the valve stem.

6. Valve stem heat treatment and surface nitriding treatment, have better anti-corrosion and anti-friction performance;

7. The valve stem adjustment part is clearly marked, making the operation more convenient.

With its unique bellows seal design, the bellows globe valve provides high sealing performance and longer service life, especially suitable for industrial environments with stringent requirements for sealing and harsh media conditions. It shows significant advantages in preventing media leakage, simplifying maintenance work, and adapting to a variety of working conditions, and is one of the preferred valves in the field of modern industrial fluid control.

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