Gate Valves: 2" to 30" (50 mm to 750 mm)
Globe Valves: 2” to 12” (50 mm to 300 mm)
Class 150 to 600
API 600 (Gate), API 623 (Globe), MSS SP-117
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.
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