Bellows-sealed globe valves
Hermetic metallic bellows replace stem packing for zero fugitive emissions — toxic, hazardous, chlorine, ammonia, and API 624 / ISO 15848 service.
Related products →WTA
Crane ChemPharma & Energy brand supplying bellows-sealed globe valves for zero fugitive emission service across chemical, petrochemical, oil & gas, and power plants.
ABOUT WTA
WTA bellows-sealed globe valves (stop valves) represent the most stringent approach to valve stem sealing available in industrial service. They are the valve of choice wherever regulations, safety standards, or operational requirements demand confirmed zero fugitive emissions from valve stems.
In a conventional globe valve, a packing gland seals around the valve stem. Packing is never perfect — it degrades over time, is sensitive to stem surface condition, and emits a small but continuous quantity of process fluid into the atmosphere. In many applications, this is acceptable. In others, it is not:
Toxic vapours — Even minute stem leakage of hydrogen sulphide, chlorine, ammonia, or vinyl chloride can accumulate to dangerous concentrations in enclosed plant areas Carcinogenic media — Benzene, 1,3-butadiene, and other regulated hydrocarbons have strict emission limits under environmental regulations Precious or expensive fluids — High-purity gases, catalysts, or specialty chemicals where any product loss has a direct cost Regulatory compliance — US EPA Method 21, API 624 (type testing of valve stem fugitive emissions), ISO 15848, TA Luft (Germany), and OISD guidelines in India all impose limits on allowable fugitive emissions from valve stems
WTA bellows-sealed globe valves solve the fugitive emission problem at the mechanical level. A metal bellows is attached between the valve stem and the bonnet. The bellows is a hermetically sealed, flexible metal element that compresses and extends as the stem moves up and down during valve operation. The process fluid inside the valve is completely enclosed by the bellows — there is no path for fluid to reach the stem packing.
The traditional stem packing is retained in WTA valves but serves only as a secondary, emergency seal. Under normal operation, the bellows provides total primary sealing with zero stem leakage. If the bellows ever fails, the packing functions as a backup seal and prevents immediate fugitive emission, giving the plant time for a controlled shutdown and valve replacement.
PRODUCT FAMILIES
APPLICATIONS
Hydrocarbon vapour lines — Refined products, crude oil vapour, LPG, LNG; benzene and toluene lines subject to environmental emission limits
Toxic gas service — H₂S, Cl₂, HCN, NH₃, phosgene, and other Schedule 1 chemicals where stem leakage is a safety violation
Steam systems — High-pressure and superheated steam lines where packing leakage causes efficiency loss and burn hazard
Precious gas containment — Specialty gases in semiconductor and electronics manufacturing; catalyst gas in refineries
Nuclear and radiological service — Where any leakage of radioactive fluid is unacceptable
Pharmaceutical and biotech — High-purity process gas and fluid lines where cross-contamination or product loss must be zero
Underground and enclosed installations — Where ventilation cannot adequately dilute any stem leakage
WHY SOURCE THROUGH PCE
More than the product. The right product, correctly selected.
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Application assessment — Our team reviews duty conditions, fluid properties, and site constraints before specifying any product.
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Engineering documentation — Datasheets, test certificates, and inspection reports prepared to your procurement and regulatory requirements.
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Principal coordination — Direct liaison with manufacturer engineering teams for non-standard or critical applications.
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Supply follow-through — Lead time, quality, and documentation managed through to commissioning support.
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