What Are Bellows Sealed Valves?
Bellows sealed valves use a metallic bellows element to seal the stem instead of conventional packing glands — achieving zero fugitive emissions. They are the preferred choice for steam, toxic, corrosive, and high-value fluid applications.
PureSys India supplies GESTRA bellows seal valves and bellows seal gate & globe valves.
How They Work
A thin-walled stainless steel bellows is welded to both the stem and valve body. As the stem moves, the bellows compresses/extends — providing a hermetic seal with no dynamic contact with the process fluid. A secondary packing gland acts as a safety backup.
GESTRA Bellows Seal Valves
GESTRA bellows seal valves are engineered for steam and condensate systems:
- Welded stainless steel bellows — guaranteed leak-free
- Pressure ratings up to PN 40 and beyond
- Temperature range up to 400°C
- Globe and gate configurations available
- Compliant with TA Luft, ISO 15848 fugitive emission standards
Bellows Sealed vs Packed Valves
| Feature | Packed Valve | Bellows Sealed Valve |
|---|---|---|
| Stem leakage | Possible over time | Zero — hermetic seal |
| Maintenance | Regular packing replacement | Minimal |
| Fugitive emissions | Present | None |
| Lifecycle cost | Lower upfront, higher ongoing | Higher upfront, lower lifecycle |
Key Applications
- High-pressure steam isolation
- Pharmaceutical clean steam systems
- Chemical and petrochemical plants
- Power stations and district heating
Enquire Today
To select the right bellows sealed valve, contact PureSys India or view all isolation valves.