1. Product Introduction
This complete lineup ofZHONGCHUAN fuel purifier spare parts is precision manufactured to exclusively fit ZHONGCHUAN AF204 series fuel purifiers, the widely used centrifugal fuel purification equipment for marine vessels, offshore drilling rigs, and land-based diesel power systems. Every component — including standardized O-rings, industrial bearings (NSK/SKF), oil seals, friction assemblies, and OEM-spec fasteners — is built to match original dimensional tolerances, material hardness, and sealing performance ratings, ensuring zero compatibility issues and reliable long-term operation. These parts cover all wearable, replaceable components of the AF204 purifier, addressing common failure points that cause fuel contamination, oil leakage, and equipment shutdowns.
2. Core Purpose
Core Purpose: These spare parts are designed to restore sealing integrity, stabilize rotational operation, eliminate fuel/water leakage, and maintain efficient separation of impurities, water, and sludge from diesel and heavy fuel oil. They support emergency breakdown repairs, routine preventive maintenance, and full equipment overhauls for ZHONGCHUAN AF204 fuel purifiers, keeping fuel purification systems compliant with marine engine fuel quality standards and reducing engine wear from contaminated fuel.
3. Key Functional Highlights
- Leak-Proof Sealing: Fuel-resistant O-rings (OD42X3.1, OD80X3.1, OD480X5.7) and oil seals (30X40X7) deliver 100% sealing performance under 0.3–0.5MPa working pressure, preventing fuel/water leakage and external dust intrusion.
- Smooth Rotational Operation: Premium NSK 6205/6208 and SKF 2305/6309 bearings reduce rotational friction by 30% compared to generic bearings, minimizing vibration and extending purifier spindle life.
- Stable Clutch & Braking: Friction blocks/plates (AF204.06.02.00/AF204.06.03.00) maintain consistent braking torque, ensuring stable startup and shutdown of the purifier’s centrifugal core.
- Secure Mechanical Fastening: GB-standard screws, nuts, and cotter pins resist corrosion and loosening in high-vibration marine/drilling environments, maintaining structural integrity of the purifier assembly.
4. Structural & Material Features
All parts use industrial-grade, corrosion-resistant materials optimized for fuel exposure: O-rings and seals are made of nitrile butadiene rubber (NBR) for exceptional fuel oil compatibility; bearings feature high-carbon chromium steel for wear resistance; fasteners comply with GB/T national standards for mechanical strength; and friction components use wear-resistant composite materials. The modular, drop-in design allows quick replacement without specialized tools, cutting maintenance labor time by up to 60%.
5. Applicable Operating Conditions
These spares are engineered for harsh marine and offshore drilling工况: operating temperatures ranging from -10°C to 85°C, high-humidity saltwater environments, continuous 24/7 operation, and high-vibration conditions onboard ships and drilling rigs. They are fully compatible with diesel fuel, heavy fuel oil (HFO), and marine gas oil (MGO) purification processes, meeting international marine equipment performance standards.
6. Maintenance & Care Recommendations
- Preventive Inspection: Check O-rings and seals for hardening/cracking every 3 months; inspect bearings for abnormal noise/play every 6 months; tighten fasteners to specified torque after 500 operating hours.
- Replacement Schedule: Replace sealing parts every 12 months (or 8,000 operating hours) and bearings every 24 months to prevent unexpected failures.
- Storage Tips: Keep spare parts in a dry, cool environment (humidity <60%) to prevent rubber seal degradation and metal part corrosion; avoid direct sunlight exposure.
We supply the following spare parts:
| ITEM | ITEM DESCRIPTION | MFG NAME | PART NO. |
| 1 | O-ring, OD60X5.7 | NANJING ZHONGCHHUAN | 60X5.7 |
| 2 | Stop moving a washer OD-50 | GB858-1988 | |
| 3 | Chassis nut | M50X1.5 | |
| 4 | O-ring, OD80X3.1 | 80X3.1 | |
| 5 | Oil seal 30X40X7 | HG4-692-67 | |
| 6 | Bearing | NSK6208 | |
| 7 | Cylindrical pin 8X80 | GB117-76 | |
| 8 | Bearing | NSK6205 | |
| 9 | Stop moving a washer 25 | GB858-88 | |
| 10 | Axis end nut M25X1.5 | GB810-76 | |
| 11 | Pad | AF204.05.13.00 | |
| 12 | Screw 8 | GB848-85 | |
| 13 | Spring screw 8 | GB93-87 | |
| 14 | Screw | AF204.05.14.00 | |
| 15 | Small spring | AF204.07.07.00 | |
| 16 | Cotter pin 1.6X18 | GB/T91-2000 | |
| 17 | Friction block | AF204.06.02.00 | |
| 18 | Friction plate | AF204.06.03.00 | |
| 19 | Brake screw | AF203.03.03.06 | |
| 20 | Bearing | SKF2305 | |
| 21 | Bearing | SKF6309 | |
| 22 | Vertical axis bottom nut | AF204.02.04.00 | |
| 23 | Big spring | AF204.07.02.00 | |
| 24 | Buffer screw | AF204.07.08.00 | |
| 25 | Screw M6X10 | GB/T819.2-1997 | |
| 26 | O-ring | OD50X5.7 | |
| 27 | Distributor pressing nut | AF204.08.04.00 | |
| 28 | Nylon pad | AF204.08.09.00 | |
| 29 | Register pin | AF204.08.08.00 | |
| 30 | Distributor pad | AF204.08.10.00 | |
| 31 | Seal O ring | OD110X3.1 | |
| 32 | Seal O ring | OD100X3.1 | |
| 33 | Water supply house seal ring | AF204.08.06.00 | |
| 34 | Bowl set pin | AF204.01.21.00 | |
| 35 | Seal O ring | OD170X4 | |
| 36 | Skating block spring | AF204.01.23.00 | |
| 37 | Seal O ring | OD105X3.1 | |
| 38 | Screw | AF204.01.19.00 | |
| 39 | Piston seal ring | AF204.01.09.00 | |
| 40 | Seal O ring | OD50X3.1 | |
| 41 | Vertical nut | AF204.01.25.00 | |
| 42 | Disc assembly | AF204.01.05.00 | |
| 43 | Seal O ring | OD80X3.1 | |
| 44 | Seal O ring | OD110X5 | |
| 45 | Nylon ring | AF204.01.08.00 | |
| 46 | Gravity ring washer | AF204.01.27.00 | |
| 47 | Seal O ring | OD56X3.5 | |
| 48 | Seal O ring | OD42X3.5 | |
| 49 | Seal O ring | OD42X3.1 | |
| 50 | Seal O ring | OD480X5.7 |
On-Site Fault Repair Cases (Field Scenarios)
Case 1: Marine Fuel Purifier Oil Leakage
A coastal cargo ship reported severe fuel leakage at the purifier’s distributor assembly. Inspection found cracked OD80X3.1 O-rings due to fuel degradation. Replacing the worn seals with genuine ZHONGCHUAN-spec spares stopped leakage immediately and restored normal purifier operation.
Case 2: Drilling Rig Purifier Abnormal Vibration
An offshore drilling rig’s AF204 purifier developed heavy vibration and loud noise during operation. Testing revealed worn NSK 6205 bearing with reduced lubrication retention. Installing a new premium bearing eliminated vibration and stabilized rotational speed.
Case 3: Ship Purifier Startup Failure
A fishing vessel’s fuel purifier failed to start and displayed braking system faults. The issue was traced to worn friction plates (AF204.06.03.00) with reduced friction coefficient. Replacing the friction assembly fixed startup issues and restored full braking functionality.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts 100% compatible with ZHONGCHUAN AF204 fuel purifiers? | Yes, every part is manufactured to match the original AF204 purifier’s dimensions, materials, and performance specs, ensuring direct drop-in replacement with no modifications needed. |
| What is the service life of the sealing O-rings and bearings? | NBR O-rings last 8,000–10,000 operating hours under normal fuel exposure; premium NSK/SKF bearings have a service life of 15,000–20,000 hours with proper lubrication. |
| Do these parts meet marine industry standards? | Absolutely — sealing components are fuel-resistant, bearings meet ISO 492 precision standards, and fasteners comply with GB marine mechanical standards, suitable for offshore and shipboard use. |
Procurement Call to Action
This full range of ZHONGCHUAN AF204 fuel purifier parts is your reliable solution for emergency repairs, scheduled maintenance, and complete equipment overhauls. Each component is manufactured to strict OEM standards, with clear part number labeling (AF204-series codes, GB standards, bearing models) to serve as your official procurement and technical reference for accurate part selection.
Whether you need individual sealing parts for urgent leak fixes, bearings for vibration reduction, or full kits for comprehensive overhauls, this parts lineup delivers consistent quality and performance for marine and drilling fuel purification systems. Use the detailed part descriptions and specifications to verify compatibility with your AF204 purifier, and reach out for further technical support to streamline your ordering process. Invest in these genuine-grade spares to minimize downtime, maintain fuel purity, and protect your engine and purification equipment long-term.
