Product Introduction

Bellows Sealed Globe Valve, also known as bellows sealed stop valve, features an automatic girth welding design that forms a metal barrier between the fluid medium and the atmosphere, ensuring zero leakage of the valve stem. The valve incorporates an internal bellows structure: the lower end of the stainless steel bellows is welded to the valve stem to prevent corrosion of the stem by process fluids, while the other end is positioned between the valve body and bonnet to form a static seal. Equipped with a dual-seal design (bellows + packing), the valve stem packing will prevent leakage if the bellows fails. The bellows is welded to the valve stem to maintain stable operating performance and avoid stem vibration caused by plug oscillation. It is ideally suited for pipelines carrying media such as steam, flammable, explosive, heat transfer oil, high-purity, and toxic substances.

Technical Features

• Reasonable product structure, reliable sealing performance, and aesthetic appearance;

• Sealing surface overlay welded with Co-based cemented carbide, offering excellent wear resistance, corrosion resistance, anti-friction performance, and long service life;

• Valve stem undergoes quenching and tempering with surface nitriding treatment, ensuring good corrosion resistance and anti-friction properties;

• Dual-seal design (bellows + packing) for enhanced reliability—valve stem packing prevents leakage if the bellows fails, complying with international sealing standards;

• Intuitive indication of valve stem lifting position;

• Part materials, flanges, and butt weld dimensions can be customized according to actual working conditions or user requirements to meet various engineering needs;

• No fluid loss, reducing energy consumption and improving plant equipment safety;

• Long service life, minimizing maintenance frequency and operational costs;

• Robust bellows seal design guarantees zero valve stem leakage and maintenance-free operation;

• PTFE soft sealing material for gas medium valve seats enhances sealing performance;

• Tapered hard-sealed valve seats for high-temperature applications achieve airtight zero leakage.

Basic Technical Standards

Product Performance Specification

Note: Flange connection can be customized as customer’s requirements.

Main Component Materials

General Specification Parameters