Bellow Seal Globe Valve – Class 150 & 300
Bellow seal globe valves with metallic bellows welded on the stem for zero fugitive emission. Design per BS 1873 / API 623. Bellows material AISI 316Ti / Inconel 625 / Hastelloy C-276. Sizes 1" to 12". Ideal for toxic, flammable, radioactive, and environmentally sensitive services.
Quick Summary
Bellow Seal Globe Valve = Globe valve with metallic bellows instead of gland packing. Bellows are welded on the plug/stem and between body and bonnet. This ensures ZERO leakage through the gland. Eliminates the most frequent and serious problem in conventional valves — gland leakage. Available in Class 150 & 300, sizes 1" to 12".
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Key Specifications
Export Ready: Supplied to refineries, petrochemical plants, and power plants. EN 10204 3.1 MTCs. Third-party inspection supported. Helium leak test certificates provided.
Why Bellow Seal Valves?
The Problem with Gland-Packed Valves
Gland leakage is the most frequent and serious problem in conventional valves. It can cause: environmental and ecological hazards, health risks to plant workers, fire hazards from flammable media leakage, explosive or poisonous mixtures from air ingress, and continuous maintenance demands especially in inaccessible locations.
Zero Leakage
Metallic bellows welded on stem and bonnet ensure absolutely zero fugitive emission through the gland area.
Maintenance-Free
No gland packing to adjust or replace. Eliminates routine stem packing maintenance and reduces plant downtime.
EPA Compliant
Meets stringent environmental regulations for fugitive emission control in refineries, chemical plants, and power stations.
Safety
Prevents leakage of toxic, flammable, or radioactive media. Critical for hazardous service in chemical and nuclear plants.
Bill of Materials
Also available in WC6, WC9, C5, C12, LCB, LCC body materials. Special material grades on request.
Dimension Table – Class 150
Critical Tests for Bellows
Fatigue / Cycle Test
Tests the fatigue strength of bellows under repeated cycling. Ensures bellows can withstand the required number of open-close cycles over service life.
Helium Leak Test
Essential for vacuum service applications. Detects micro-leaks at molecular level. Performed with helium tracer gas and mass spectrometer for ultimate leak detection sensitivity.
Hydrostatic Test (API 598)
Standard shell and seat test per API 598. Class 150: Body 30 kg/cm², Seat 22 kg/cm². Class 300: Body 78 kg/cm², Seat 57 kg/cm².
Applications
Petrochemical Plants
Toxic & Flammable Media
Nuclear Power
Radioactive Media
Chemical Processing
Corrosive Chemicals
Pharmaceutical
Clean & Sterile Systems
Thermal Power
Steam & Hot Oil Systems
Cryogenic Service
LNG, Nitrogen, Oxygen
Frequently Asked Questions
What is a bellow seal globe valve?
A bellow seal globe valve uses metallic bellows welded between the stem and bonnet to provide a hermetic seal, achieving zero fugitive emission. Unlike conventional gland-packed valves, the bellows eliminate stem packing leakage entirely, making them ideal for toxic, flammable, radioactive, and environmentally sensitive services.
Why use bellow seal valves instead of gland-packed valves?
Gland leakage is the most frequent problem in conventional valves — causing environmental hazards, health risks, fire hazards, and continuous maintenance needs. Bellow seal valves provide zero fugitive emission, maintenance-free stem sealing, EPA compliance, and reduced downtime costs.
What bellows materials are available?
AISI 316Ti (standard), Inconel 625 (high temp/corrosive), Hastelloy C-276 (severe corrosion), AISI 321 (stabilized austenitic). Multi-ply hydroformed bellows welded to stem and bonnet for leak-proof sealing.
What tests are performed on bellow seal valves?
Fatigue/Cycle Test for bellows fatigue strength, Helium Leak Test for vacuum service (detects micro-leaks at molecular level), standard hydrostatic shell and seat tests per API 598, and pneumatic air test.
Need Bellow Seal Globe Valves?
We supply to refineries, chemical plants, and power stations worldwide. EN 10204 3.1 MTCs. Helium leak test certificates. Third-party inspection available.