Bellows Sealed Globe Valve

Product Advantages

● Zero Stem Leakage: Ideal for hazardous, toxic, or high-purity media.
● Extended Service Life: Bellows prevent packing wear and reduce maintenance frequency.
● Suitable for High Temperature & Pressure: Covers Class 150–1500 / PN10–PN250.
● High Cleanliness & Reliability: Ensures safe operation in critical industrial processes.
● Energy Saving & Environmental Protection: Eliminates fugitive emissions and reduces media

Size Range

● NPS 1/2″ – 16″ / DN15 – DN400

Pressure Rating

● Class 150 – Class 1500
● PN10 – PN250

Standards

● Design Standard: EN 13709 / ASME B16.34 / API 623
● Test Standard: EN 12266 / ISO 5208 / API 598
● Flange Standard: EN 1092-1 / ASME B16.5 / ASME B16.47

Industry Applications

● Chemical and petrochemical processing
● Steam, condensate, and thermal oil systems
● Toxic, hazardous, or flammable fluid pipelines
● Pharmaceutical and high-purity media systems
● Vacuum and negative-pressure lines
● Refining and gas processing facilities

FAQs

1. What does “bellows sealed” actually prevent that standard packing doesn’t?
Standard packing relies on compression around the stem, which wears and can leak over time. A welded stainless steel bellows fully isolates the stem from the atmosphere, so there’s no leak path even after repeated cycling — critical for toxic, flammable, or high-purity media.

2. Globe valve or gate valve — which one do I need for throttling?
If you need to regulate flow rather than just shut it off, a globe valve’s S-shaped flow path gives you that control; a gate valve is better suited to full on/off isolation with minimal pressure drop. See our full comparison in Gate Valve vs. Globe Valve: 5 Key Differences to Know.

3. How long does the bellows in a bellows sealed globe valve typically last?
Most bellows are rated for tens of thousands of full-stroke cycles before fatigue failure becomes a risk, which is why most designs pair the bellows with backup packing rather than relying on it alone.

4. If the bellows fails, does the whole valve need to be replaced?
Usually not — backup packing takes over sealing until the next planned shutdown. Whether the bellows itself can be repaired in the field depends on whether the bonnet is bolted or fully welded.

5. Why do specifiers often require a rising stem globe valve over a non-rising stem design?
A rising stem gives a visible external indication of valve position, and keeps the threaded stem mechanism outside the flow path rather than in contact with the process media.

6. What should a buyer check when qualifying a bellow seal globe valve manufacturer?
Ask for bellows welding process qualification (automatic roll welding is standard), third-party pressure/leak test reports, and fugitive emission data (ISO 15848 or API 624) if the application is emissions-sensitive — this matters more than the base material certs most manufacturers already provide.