Bellow-sealed Valves
Bellow-sealed Gate and Globe Valves
| Size | Gate Valves: 2" to 30" (50 mm to 750 mm) Globe Valves: 2” to 12” (50 mm to 300 mm) |
| ASME Class | Class 150 to 600 |
| Design Standards | API 600 (Gate), API 623 (Globe), MSS SP-117 |
Beyond Standards:
- Fugitive Emissions - Complies to ISO 15848-1: 2006 Class AH leakage
- SIL3 Safety Integrity Level for Automated Valves
- The bellows lifecycle is designed as per MSS SP-117
Features that Add Value:
- Metal bellows seal the moving stem and increase durability of packed stem seal valves
- Bellow provide a barrier between the stem at its point of entry through the pressure boundary and the process fluid within the valve, to eliminate stem leakage
- An anti-rotation device is provided in the bonnet to ensure bellow does not get twisted during assembly and disassembly or by vibration
- Bellow-sealed valves are usually leak tested using a mass spectrometer to detect leakage rates below 1x10E-06 std.cc/sec.
- Bellow-sealed bonnets are backed up with a standard stem packing set and a leakage monitoring port between the bellows and the packing in order to prevent catastrophic release of hazardous fluid in the event of a bellows leak.
Versatile Solutions:
- ValvTrac™ RFID tags for reliable digital traceability
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