L&T – Bellow-sealed Gate Valves – Bolted Bonnet

Bellow-sealed Gate Valves
Size Gate Valves: 2″ to 30″ (50 mm to 750 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