How To Produce Hydraulic Filter Elements ?

The manufacturing of hydraulic filter elements is a precise process combining material science and quality control to remove contaminants from hydraulic fluid under demanding conditions.

1. Material Preparation & Selection #MaterialScience

• Filter Media: Typically fiberglass (for excellent de-aeration) or metal fiber felt. The choice determines the initial filtration rating (e.g., 1 to 100 microns).

• Support Core/Cage: Usually a perforated metal sheet. The thickness (e.g., 0.8mm) is selected based on required pressure resistance.

• End Caps: Made from materials like galvanized steel, aluminum, or plastic (if integrated with a bypass valve).

2. Core Manufacturing Process #PrecisionEngineering

• Pleating: The filter media is machine-folded into a zig-zag pattern to maximize surface area.

• Assembly & Welding: Components (media, core, end caps) are assembled. Welding techniques like plasma welding are critical for metal filters to ensure a strong, leak-proof seal.

• Bonding: Epoxy resins are commonly used to securely bond and seal the components together.

3. Rigorous Testing & Validation #QualityControl

• Finished filters undergo tests per ISO Standards.

• Key tests include: Burst Pressure Resistance, Structural Integrity, Material Compatibility, and Fatigue Resistance.

• These ensure reliable performance under high pressure (e.g., 21 MPa/3000 psi) and temperature cycles (e.g., -30°C to +110°C).

Did You Know?

• Sintered Metal Filters: For high-strength applications, some filters are made from sintered wire mesh, involving complex welding. They are reusable and cleanable.

• Procurement Tip: Understanding the process helps identify quality. Some manufacturers may use thinner support cages (e.g., 0.5mm vs 0.8mm) to cut costs, which can compromise pressure rating and safety.

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