Product Overview
The KOZO GS-C25 Bellows Sealed Globe Valve is designed for industrial services where reduced stem leakage and controlled shut-off are important. A welded metal bellows separates the process fluid from the conventional stem packing, while the packing provides a secondary sealing barrier.
The globe-valve flow path provides positive shut-off and can also be used for throttling within the limits of the selected trim and operating conditions.
Key Design Features
- Metal bellows stem seal: Primary stem-sealing barrier for services where external leakage reduction is important.
- Secondary packing: Provides backup stem sealing outside the bellows.
- GS-C25 cast-steel body: DIN/EN material family for industrial process service.
- OS&Y-style stem movement: Provides visible stem position during operation.
- Flanged or butt-weld ends: Connection options can be selected according to piping design.
Technical Specifications
| Valve Type | Bellows Sealed Globe Valve |
|---|---|
| Body Material | GS-C25 Cast Steel |
| Size Range | DN15 – DN400 |
| Pressure Ratings | PN16 / PN25 / PN40 |
| Design Standard | EN 13709 |
| Face-to-Face | EN 558-1 |
| Flanged Ends | EN 1092-1 |
| Butt-Weld Ends | EN 12627 |
| Inspection & Testing | EN 12266-1 |
| Reference Temperature | -10°C to +400°C, configuration-dependent |
| Operation | Handwheel / Gear options |
Typical Applications
- Steam systems
- Thermal-oil systems
- Chemical process lines
- Industrial utilities
- Services where stem leakage reduction is important
Bellows Seal Design
The bellows assembly provides a physical barrier between the process fluid and the external stem packing. This can reduce routine packing leakage, but the actual leakage performance depends on bellows design, welding quality, testing and the complete valve configuration. The page therefore does not claim universal “zero leakage.”
Available Configurations
Body material, trim, connection type, operator and bellows material can be selected according to temperature, pressure and process medium.
How to Specify This Valve
Please provide DN, PN rating, process medium, design pressure, design temperature, connection type, trim, bellows material, operator and applicable project standards.
FAQ
What is the purpose of the bellows seal?
The bellows provides a primary barrier around the moving stem, reducing direct process-fluid contact with conventional packing.
Can the valve be used for throttling?
Globe valves can be used for flow regulation, but throttling suitability depends on pressure drop, trim, cavitation/erosion risk and the actual service conditions.
