Hydraulic Oil Filter Element – Model HY-18438

A high-performance return-line hydraulic oil filter element engineered for hydraulic power units, mobile equipment, compressor lube systems, and industrial machinery. HY-18438 is a replacement cartridge originally specified within the MPF100-class return filter series, rated for 240 L/min flow at 0.5 bar differential pressure with ISO VG32-equivalent oil . Built around a glass-fiber media pack qualified to ISO 16889 multi-pass testing, the element delivers β₂₇ = 1000 — capturing 99.9 % of particles at 27 µm and above . With a compact envelope of 70 mm OD × 211.5 mm length × 40.5 mm ID, an integral 1.75 bar bypass valve, and a 10 bar max. differential pressure rating , HY-18438 is ideally suited to return-line circuits on steel mill hydraulic stations, power plant auxiliaries, mining equipment, and mobile hydraulic systems where high dirt-holding capacity must be achieved in a small form factor.

Key Features

• Glass-fiber media — high tensile strength, temperature-resistant, corrosion-proof, non-combustible

  
  

• β₂₇ = 1000 per ISO 16889 multi-pass — 99.9 % efficiency at 27 µm; 99 % overall filtration efficiency

  
  

• 25 µm absolute-grade (A25 configuration) — optimized for return-line particulate control

  
  

• Compact pleated construction — 70 mm OD × 211.5 mm length × 40.5 mm ID

  
  

• Integral bypass valve — cracks at 1.7–1.75 bar to protect the system if the media clogs

  
  

• 10 bar max. differential pressure — collapse-rated for return-line duty

  
  

• NBR seal standard — -25 °C to +120 °C operating range

  
  

• Gradient-density media structure — high dirt-holding capacity with low initial ΔP

  
  

• Fiber stability — even under intense vibration, media fibers will not shed into the hydraulic circuit

  
  

• Laser-cut and laser-welded — precise dimensional accuracy, leak-tight seams

  
  

Technical Specifications

Application Guidance

HY-18438 is deployed as a return-line element on:

• Steel mill hydraulic stations and rolling-mill return circuits

  
  

• Power plant turbine lube oil and auxiliary hydraulic systems

  
  

• Mining machinery and resource depot hydraulic power units

  
  

• Mobile hydraulic equipment — excavators, loaders, cranes

  
  

• Paper mill and paper-making enterprise hydraulic stations

  
  

• Petroleum, metallurgy, chemical, railway, and offshore oil field hydraulic systems

  
  

• Compressor lube circuits and screw compressor oil conditioning

  
  

The 25 µm A25 glass-fiber media delivers effective return-line particulate control, capturing wear particles generated by cylinders and motors before they re-enter the reservoir. Target ISO 4406 oil cleanliness by circuit position:

• Servo control valves: 16/14/12 — requires 3–5 µm filtration (finer pressure-line element needed upstream)

  
  

• Piston pumps / motors: 18/16/14 — supported by 10 µm pressure-line filtration

  
  

• Vane / gear pumps: 19/17/14 — supported by 10–25 µm filtration

  
  

• Return-line duty (HY-18438): 25 µm — captures coarse wear debris, extends fine element life

  
  

📌 Circuit position note: HY-18438 is specified as a return-line element (MPF100 series, 240 L/min, 10 bar max. ΔP) . It is not a pressure-line element — for pump-discharge protection on piston pumps, a 5–10 µm pressure-line element with higher collapse rating (≥ 160 bar) must be installed separately. The 1.75 bar bypass valve ensures continuous flow even if the element clogs, but bypassed oil is unfiltered — monitor the clogging indicator and replace proactively.

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV, HH, HL) — NBR seals standard

  
  

• Mineral turbine / gear / compressor lube oil

  
  

• HFC water-glycol — NBR acceptable; FKM recommended

  
  

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

  
  

• Phosphate ester (HFDR) — FKM seals mandatory (not standard NBR trim)

  
  

Installation & Service

1. Shut down the equipment; relieve system pressure to 0 bar and isolate the filter housing.

   
   

2. Open the housing cover, withdraw the spent cartridge by its center tube.

   
   

3. Inspect the housing interior, bypass spring, and seal grooves. Check the spent media for metal particles — copper or iron debris indicates pump/valve damage; rubber fragments signal seal failure.

   
   

4. Seat the new HY-18438 element — confirm flow direction (Outside → Inside). Renew all O-rings / seals.

   
   

5. Close the housing, torque bolts evenly. Bleed air at the bleed port.

   
   

6. Restart and gradually ramp up to working pressure — never open the valve instantly to full flow.

   
   

7. Replace per clogging indicator or service interval. Typical replacement: 1000–2000 operating hours in moderate contamination; 250–500 hours in foundry, mining, or marine heavy-duty environments.

   
   

8. Glass-fiber elements are disposable — never attempt to clean; a clogged element left in service triggers the 1.75 bar bypass valve, allowing unfiltered oil to circulate.

   
   

⚠️ Over 70 % of hydraulic system failures originate from fluid contamination. The return-line filter is the primary contamination control point — matching the correct micron grade (25 µm for HY-18438) and β-ratio (β₂₇=1000) is the single most cost-effective maintenance decision. Verify the bypass valve setting matches your housing — an incorrectly calibrated element allows unfiltered oil to circulate, causing component wear.

Quality Assurance

• ISO 16889 – Multi-pass filtration performance (β-ratio, dirt-holding capacity, ΔP)

  
  

• ISO 2941 – Collapse/burst resistance (validated to 10 bar)

  
  

• ISO 2942 – Manufacturing integrity (bubble point)

  
  

• ISO 2943 – Media/fluid compatibility

  
  

• ISO 3723 – End-load compliance

  
  

• ISO 3724 – Flow fatigue under cyclic differential pressure

  
  

• ISO 3968 – Differential pressure vs. flow-rate characteristics

  
  

Ordering

Specify HY-18438 (70 mm OD × 40.5 mm ID × 211.5 mm, glass-fiber, β₂₇=1000, 25 µm A25, 1.75 bar bypass, NBR seal) together with:

• Seal material (NBR standard / FKM for phosphate-ester or high-temperature duty)

  
  

• Media configuration (glass-fiber standard / alternative micron grades on request)

  
  

• Bypass valve cracking pressure (1.75 bar standard; custom settings available)

  
  

Cross-references available: HY18438 ↔ DONALDSON CR15003 / P171843, PARKER 6001554 / 943718Q, MP FILTRI MF1003A25NB, BEHRINGER BEF100325A, IKRON HHC01355 / HEK0520201ASFG025VMB17B, SOFIMA RE30FV1, UFI ERA33NFD, WIX R19C25GB, among others .

Provide your existing element's dimensions or the host filter housing model for cross-reference confirmation.

All values nominal; HY-18438 is documented at 70 mm OD × 40.5 mm ID × 211.5 mm length, glass-fiber media, β₂₇=1000, 25 µm (A25), 99 % efficiency, 10 bar max. differential pressure, 1.75 bar bypass valve, NBR seal, -25 °C to +120 °C, 0.28 kg, 240 L/min rated flow . It belongs to the MPF100-class return filter series (MPF100-3 variant) . Confirm housing compatibility (70 × 40.5 × 211.5 mm envelope, 1.75 bar bypass) before installation. Select seal material per fluid type: NBR for mineral oil and water-glycol; FKM mandatory for phosphate-ester. Glass-fiber elements are disposable; replace per clogging indicator or 1000–2000 hour service interval.