Precision 7075 Micro Hydraulic Pump Valve Housing with Multi-Step Sealing Surface Control

We successfully manufactured a precision 7075 aluminum micro hydraulic pump valve housing for an automotive component application. This compact, high-pressure hydraulic component features multiple stepped sealing surfaces and intersecting deep fluid channels — presenting significant machining challenges including multi-step sealing surface flatness and parallelism control, and cross-channel deep-hole burr removal. Through precision boring operations, optimized machining sequences, and specialized internal deburring techniques, we delivered leak-tight valve housings meeting stringent automotive hydraulic performance requirements.

Project Overview

Key Technical Highlights

• Multi-Step Sealing Surface Precision: Achieved ≤0.005mm flatness on individual sealing faces and ≤0.01mm parallelism between stepped surfaces through precision boring and controlled finishing sequences — ensuring leak-free sealing in high-pressure hydraulic applications.
• Process Innovation:
  • Precision Step Boring: Dedicated boring operations with micron-level depth control achieve consistent step heights and sealing face geometry across all production units.
  • Cross-Channel Deep-Hole Deburring: Specialized internal deburring tools and controlled fluid-flush techniques remove burrs at intersecting deep-hole junctions — preventing contamination and flow disruption in critical hydraulic circuits.
  • Single-Setup Machining: All sealing surfaces, bores, and fluid channels machined in a single fixturing setup, ensuring geometric alignment between all features.
  • Stress-Relief Strategy: Controlled machining sequences minimize residual stress in the 7075-T6 material, maintaining sealing surface flatness after machining.
• Surface Quality:
  • Precision finishing achieves Ra≤0.8μm surface finish on all sealing surfaces.
  • All fluid channels verified burr-free through borescope inspection.

Quality Verification

Each component underwent comprehensive inspection using CMM measurement for sealing surface flatness (≤0.005mm), parallelism (≤0.01mm), and dimensional accuracy (±0.015mm), supplemented by surface roughness testing (Ra≤0.8μm), borescope inspection for internal channel burr-free verification, and leak testing.

Industry Applications

This solution demonstrates our expertise in precision hydraulic component manufacturing, ideal for:
✓ Micro hydraulic pump housings ✓ Valve bodies and manifolds ✓ Automotive hydraulic systems ✓ High-pressure fluid control components

Why Partner With Us?

• Proven expertise in multi-step sealing surface flatness and parallelism control
• Advanced cross-channel deep-hole deburring capabilities
• Precision boring for micron-level sealing face geometry
• 12+ years of precision manufacturing experience across automotive and fluid power sectors