What is the difference between a globe valve and a bellow sealed globe valve?

The bellows sealed globe valve, is manufactured with automatic girth welding. It forms a metal barrier between the fluid medium and the atmosphere, achieving a zero stem leakage design. Compared with traditional globe valves, it has the following advantages:

1. Long service life, reducing maintenance frequency and operational costs. The robust bellows sealing design ensures zero stem leakage, providing maintenance-free operation. 2. Small opening and closing torque, reducing labor intensity. It can be equipped with any type of actuator, facilitating remote control. 3. Elegant appearance with a smooth flow channel, minimizing the flow resistance coefficient. It is a high-quality energy-saving product. 4. Reliable external sealing through a combination of bellows, graphite, and stainless steel gaskets. The sealing elements do not require replacement during long-term use.

In industrial applications, external leakage from globe valves — especially for high-temperature, highly toxic, flammable, explosive, or radioactive media — not only pollutes the environment but also frequently causes significant personal injury and property damage. This type of bellows sealed globe valve is much safer and more stable, designed and manufactured in strict compliance with advanced international standards.

Bellows sealed globe valves have no external leakage, making them safe for applications involving high-risk media.

Ordinary globe valves use packing seals, where sliding occurs between the stem and packing, leading to easy leakage (valve core leakage) at low temperatures.

Bellows sealed globe valves replace packing seals with flexible, airtight bellows (capable of expansion and compression), effectively preventing external leakage caused by packing wear. They are typically used for transporting highly permeable media (e.g., valves in hydrogen systems), with no external leakage as long as the bellows remains intact — a common issue with packing-sealed ordinary globe valves.