Bellow-sealed Valves

Special Features & Benefits

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

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.

Description

Features

Bellow-sealed Valves

Fugitive Emissions – Complies to ISO 15848-1: 2006 Class AH leakage
Bellow eliminates any kind of leakage through stuffing box area.
An anti-rotation device is provided in the bonnet for protection of bellow
Bellow-sealed bonnets are backed up with a standard stem packing system to avoid any catastrophic release of hazardous fluid in the event of a bellows failure.
The bellows lifecycle is designed as per MSS SP-117 and can be offered in stainless steel, Inconel or Hastelloy.

Valves for Corrossion Service : Optimised design solution is provided by L&T Valves for corrossion services. This optimised design reduce material consumption in high alloys maintaining long life of product

Design Standards API 603 (Gate valves ), ASME B16.34 (Globe & Check Valves)

Gate Valves: 2″ -24″ | ASME Class Class 150 to 600
Globe & Check Valves: 2″ -12″ | ASME Class Class 150 to 600