938291Q Parker Hydraulic Filter Element Replacement

Product Overview

The 938291Q Hydraulic Oil Filter Element is a premium, engineering-grade filtration solution designed for direct, 100% interchangeable replacement of Parker original 938291Q series elements. Manufactured to stringent ISO fluid power cleanliness standards, it features advanced multi-layer Microglass inorganic fiber media supported by high-strength perforated cores and corrosion-resistant galvanized steel caps. Every element undergoes 100% simulated operating condition testing and pressure resistance verification to provide maximum particle retention, lower pressure drops, and exceptional structural stability, protecting high-pressure pumps, hydraulic motors, and proportional valves from continuous system wear.

Technical Specifications

• Model Code: 938291Q (Cross-compatible series: 938293Q, 938294Q, 938290Q, 938292Q, 938269Q, 938273Q)

• Filtration Rating: 10 µm absolute ($\beta_x(c) \ge 200$)

• Filter Material: 10Q Grade Microglass (Multi-layer inorganic glass fiber)

• Collapse Pressure Rating: 20 bar (2.0 MPa / 290 psi)

• Operating Temperature Range: -29°C to +120°C (-20°F to +250°F)

• Sealing Material: Fluorocarbon (Viton standard, compatible with synthetic lubricants & fire-resistant fluids)

• Flow Direction: Out-to-In

• Fluid Compatibility: Mineral oils, synthetic fluids, water-glycols, and phosphate esters

• Net Weight: Approx. 1.85 kg

Key Technical Advantages

• Microglass Gradient Pleat Geometry: High-density inorganic glass fiber design offers superior porosity and a maximum effective surface area, providing over 30% higher dirt-holding capacity and extending maintenance intervals.

• Exceptional Collapse Resistance: Reinforced with heavy-duty galvanized wire mesh and a rugged perforated inner core, preventing pleat collapse and fatigue under high differential pressure surges or cold fluid startups.

• Minimal Initial Delta-P ($\Delta p$): Precision-spaced pleating minimizes internal fluid restriction, lowering system power losses and protecting upstream hydraulic pumps against cavitation risks caused by flow restriction.

• 100% Drop-In Interchangeability: Manufactured strictly to OEM envelope dimensions and machining tolerances, allowing seamless direct replacement in original Parker filter housings without modifications.

Application Areas

• Metallurgy & Steel Mills: Continuous casting hydraulic systems, AGC roll positioning, and heavy lubrication units.

• Plastics & Injection Molding: High-tonnage injection molding machinery and servo-hydraulic power units.

• Heavy Mining & Construction Equipment: Hydraulic excavators, mobile crushers, and rotary drilling rigs.

• Power Generation: Wind turbine pitch/yaw control systems and steam turbine EH fluid loops.

Expert Maintenance Tips

• Differential Pressure Monitoring: Always equip the housing with a differential indicator. Replace the 938291Q element when the differential pressure reaches 2.0 bar, and ensure element servicing before reaching 2.5 bar.

• Proper Installation Protocol: Thoroughly clean the interior housing cavity before installing the new element. Always pre-lubricate the Viton O-ring seal with clean system hydraulic fluid to prevent twisting or mechanical shear during insertion.

• Fluid Contamination Sampling: Take hydraulic oil samples for particle counting (ISO 4406) during filter replacement intervals to proactively monitor mechanical wear on upstream pumps and motors.

Alternative model

Other brands (such as HYDAC, MANN, Donaldson) also have oil-absorbing filter elements of corresponding sizes and precision, but their part numbers are completely different.

938253Q 938257Q 938261Q 938265Q 938269Q 938273Q