Hydraulic & Lubrication Oil Filter Elements – Models 531A0218H02 & 531A0028H01

Two high-performance oil filter elements engineered for industrial hydraulic and lubrication circuits. 531A0218H02 is a return-line fine filtration element designed for dual-cartridge (dual-barrel) return filter assemblies used on heavy machinery, mining equipment, and metallurgical machinery — protecting the system while allowing element replacement without shutting down the host machine . 531A0028H01 is a hydraulic/lubrication oil filter element built with HV fiberglass or high-efficiency cellulose media, suitable for hydraulic systems, gear boxes, and oil circulation loops across injection molding machines, power plants, steel mills, and petrochemical installations .

Key Features

• 531A0218H02: Fine filtration for return oil, captures metallic wear particles and rubber seal debris, supports online replacement via diverter valve, integrated clogging indicator and bypass valve

  
  

• 531A0028H01: HV fiberglass / cellulose / stainless steel mesh media, filtration ratings 1 / 3 / 6 / 12 / 25 µm, efficiency up to 99.99 %

  
  

• Both: NBR or fluoro-rubber (FKM) sealing rings, all-metal housing components with anti-corrosion plating

  
  

• 531A0218H02: dual-barrel design with diffuser at tank-return bottom — minimizes foaming and air re-entrainment

  
  

• 531A0028H01: available in 1.0 / 2.0 / 16.0 / 21.0 MPa pressure classes to match circuit position

  
  

Technical Specifications

Application Guidance

531A0218H02 – Installed on dual-cartridge return filter assemblies mounted on top, side, or bottom of the hydraulic reservoir. When one element reaches its clogging threshold (ΔP = 0.35 MPa), the integrated indicator signals the operator to rotate the diverter valve, switching to the standby barrel while the clogged element is serviced — keeping the host machine running without interruption . This design is critical for continuous-process industries (mining conveyors, rolling mills, extrusion lines) where unplanned shutdown is costly.

531A0028H01 – A versatile hydraulic/lubrication oil element for both industrial and mobile equipment. The selectable micron rating (1 µm for servo-valve protection, 25 µm for coarse suction/pressure-line guard) and selectable pressure class (up to 21 MPa) let it be specified for pump-discharge protection, return-line filtration, or gearbox lube循环. Typical hosts: injection molding machines, hydraulic power units, compressor lube circuits, power plant turbine lube systems, and steel-mill hydraulic loops .

💡 Key difference: 531A0218H02 is a system-level return filter element for dual-barrel housings — it solves the "cannot stop the machine to change filter" problem. 531A0028H01 is a circuit-level element — chosen by micron rating and pressure class to protect a specific loop (pump, valve, bearing, or gearbox). They are not interchangeable; 531A0218H02 only fits its dual-barrel return housing, while 531A0028H01 fits a broad range of standard hydraulic filter heads.

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV)

  
  

• Mineral turbine / gear / compressor oil (lubrication duty)

  
  

• Biodegradable esters (HEES, HETG) — use FKM seals

  
  

• Refrigeration compressor oil (531A0218H02 is widely used in industrial refrigeration lubrication circuits)

  
  

• HFC water-glycol — NBR acceptable; FKM recommended

  
  

• Not for phosphate ester (HFDR) without media/seal confirmation

  
  

Installation & Service

531A0218H02 (dual-barrel return filter):

1. Monitor clogging indicator — at 0.35 MPa ΔP, rotate the 2-position 6-way diverter valve to switch to the standby barrel .

   
   

2. Depressurize the clogged barrel, open its cover, withdraw the spent element by the center tube.

   
   

3. Inspect the barrel interior, bypass spring, and indicator probe.

   
   

4. Seat the new element — confirm flow direction (tank ← return). Renew all O-rings.

   
   

5. Close cover, torque evenly. The standby barrel is now ready for the next cycle.

   
   

6. If ΔP reaches 0.4 MPa before you can switch, the bypass valve opens automatically to protect the system — but replace the clogged element as soon as possible .

   
   

7. The dual-barrel design with check valve prevents tank oil from draining when servicing a side/bottom-mounted barrel .

   
   

531A0028H01 (standard hydraulic element):

1. Depressurize the circuit to 0 bar, isolate the filter housing.

   
   

2. Open housing, withdraw old element, inspect bypass and seals.

   
   

3. Seat new element with correct flow direction; renew O-rings.

   
   

4. Bleed air at bleed port; restart and check for leaks.

   
   

5. Replace per clogging indicator or service interval (typical 2000–4000 h depending on micron grade and contamination load).

   
   

Quality Assurance

• ISO 16889 – multi-pass β-ratio, dirt-holding capacity, ΔP characterization

  
  

• ISO 2941 – collapse/burst resistance

  
  

• ISO 2942 – manufacturing integrity (bubble point)

  
  

• ISO 2943 – media/fluid compatibility

  
  

• ISO 3968 – flow-fatigue and pressure-drop vs. flow

  
  

• Factory tested to OEM performance standards

  
  

Ordering

Specify 531A0218H02 (dual-barrel return filter element for heavy/mine/metallurgical hydraulic lube systems) with:

• Required micron grade (10 µm typical for return fine filtration)

  
  

Specify 531A0028H01 (hydraulic/lubrication oil filter element) with:

• Micron rating (1 / 3 / 6 / 12 / 25 µm)

  
  

• Pressure class (1.0 / 2.0 / 16.0 / 21.0 MPa)

  
  

• Seal material (NBR / FKM)

  
  

• Media type (HV fiberglass / cellulose / SS mesh)

  
  

Provide your existing element's dimensions or the host machine model and current OEM part number for cross-reference confirmation.

All values nominal; 531A0218H02 fits dual-barrel return filter housings with diverter valve and integrated clogging indicator — confirm housing type before ordering. 531A0028H01 dimensional envelope and pressure class must be confirmed against your current element or housing drawing — select micron grade to match circuit position (1–3 µm for servo valves, 10–25 µm for general hydraulic / suction).