BELLOW SEAL VALVES

BELLOW SEAL VALVES

Bellow-sealed Gate and Globe Valves

Beyond Standards:

1. Fugitive Emissions - Complies to ISO 15848-1: 2006 Class AH leakage
2. SIL3 Safety Integrity Level for Automated Valves
3. The bellows lifecycle is designed as per MSS SP-117

Features that Add Value:

Metal bellows seal the moving stem and increase the durability of packed stem seal valves

Bellow provides 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 a catastrophic release of hazardous fluid in the event of a bellows leak.