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Help CenterDuplex Switchable Oil Filter CB/T 425-94, Cast Iron Body, Stainless Steel Basket for Ship Fuel System
Product Spotlights
✅High Corrosion Resistance for Marine Oil Environment
✅Large Filtration Area, Low Pressure Drop
✅Easy Open & Quick Clean (5 mins maintenance)
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Product Name
CB/T 425-94 Marine Duplex Low Pressure Crude Oil Filter (A/AS Type) | Marine Fuel/Lube Oil Strainer
Product Description
This CB/T 425-94 marine duplex low pressure crude oil filter is a dual-basket switchable strainer designed for ship oil pipeline systems. It complies with China shipbuilding standard CB/T 425-94 (A type for GB569 flange, AS type for GB2501 flange).Widely installed in fuel oil supply, lubrication oil, purifier outlet, engine oil system to filter impurities, sludge, particles in diesel/fuel/lube oil. Protects pumps, injectors, engines, valves from wear & blockage.Key feature: duplex switchable structure allows online cleaning without shutdown—critical for continuous vessel operation.
Technical Specifications
| Item | Details |
|---|---|
| Standard | CB/T 425-94 (China Marine Standard) |
| Type | A (GB569 flange), AS (GB2501 flange) |
| Nominal Pressure | 0.4MPa (PN4) |
| Nominal Diameter | DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100 |
| Body Material | HT200 Cast Iron (anti-corrosion coated) |
| Filter Basket | Stainless Steel 304 / 316 |
| Mesh Size | 0.09/0.16, 0.13/0.18, 0.16/0.25, 0.22/0.40, 0.26/0.75 mm |
| Flange Standard | GB569 / GB2501 |
| Applicable Medium | Marine Fuel Oil (MDO), Diesel Oil, Lubricating Oil (LO) |
| Working Temp | ≤80°C |
| Structure | Duplex dual basket, manual switch handle, quick-open cover, drain plug |
| Certificates | Material Test Report, Pressure Test Report, Factory Inspection Report |
Key Advantages (Pain Point Solved)
Standard Compliance & Inspection PassFull CB/T 425-94 & GB569/GB2501. Passes shipyard & class society inspection. Avoids non-standard rejection & rework.
No Shutdown Maintenance (Biggest Benefit)Duplex design: switch between two baskets. Clean/replace filter while system runs. Eliminates engine downtime & voyage delay.
Strong Corrosion ResistanceCast iron + SS basket. Resists oil corrosion & sludge. Solves rust, leakage, clogging, short life of ordinary filters.
High Filtration Efficiency & Low Pressure DropLarge basket area, high dirt capacity. Stable flow, protects fuel pumps, injectors, main engine from damage. Reduces equipment repair cost.
Easy Operation & Fast MaintenanceQuick-open cover & swing bolt. 5 mins to clean. No pipeline disassembly. Solves hard to open, time-consuming maintenance.
Complete Size & CustomizationDN20–DN100 full range. A/AS type. Custom mesh, material, flange. Meets all ship oil system requirements.
Application Scenarios
Marine main/auxiliary engine fuel oil system
Ship lubrication oil pipeline
Oil purifier / separator outlet
Diesel generator oil supply system
Ship fuel transfer & treatment system
Marine engineering & newbuilding
Vessel repair & maintenance
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