How does Chinese Hydraulic Manifold Manufacturer AAK ensure the reliability

AAK customizes hydraulic manifold blocks for customers in multiple countries,
including Germany, the United States, Russia, and Israeli military clients.

We strictly control the selection of materials, processing techniques, surface
treatment, cleaning, and inspection to ensure the reliability and longevity of
hydraulic manifold blocks like below:

1. Materials and Pretreatment
1) Material Selection
 The valve block material should have a dense structure and be free of
defects such as sand holes and interlayers. If necessary, non-destructive
testing should be carried out.
 If forging blanks are used, they need to undergo normalizing treatment
to eliminate internal stress and non-destructive testing.
2) Pretreatment
 Cast iron or large steel parts require aging treatment or pretreatment.

2. Machining process
1) Surface processing
 The surface roughness of the hydraulic valve block must meet the design
requirements, and the installation surface (such as the contact surface of
hydraulic valves and pipe joints) must not have scratches to prevent leakage
 Rough machining requires reserved precision grinding allowance, and the
surface roughness Ra value after precision machining should meet the accuracy
requirements.
2) Chamfering and deburring
 Edge chamfer 2 × 45 ° (small valve body chamfer × 45 °), keep the
oil passage hole sharp and remove burrs.
 All flow channels (especially intersections) need to be thoroughly
cleaned of burrs to avoid residual effects on system stability.

3. Surface treatment and rust prevention
1) Coating and Marking
 The surface can be plated with electroless nickel, with a thickness
controlled between 0.008-0.012mm.
 Steel seal markings should be placed next to each oil port, with a
distance of ≥ 6mm from the hole opening, to avoid affecting the sealing
performance.
2) Rust prevention measures
 After processing, rust and dust prevention treatment should be carried
out, and sealed and stored in a clean and dry environment.

4. Cleaning and assembly
1) Cleaning
 Before assembly, the manifold block should be thoroughly cleaned using
rust proof cleaning solution or kerosene/engine oil to ensure that blind holes
and flow channels are free of iron filings and impurities.
 Maintain pressure during flushing, and switch the solenoid valve to
flush all channels.
2) Assembly
 Check if the connectivity of the ducts is consistent with the schematic
diagram, ensuring that the seals and components are all qualified products.
 When using anaerobic adhesive to seal screws, it is necessary to clean
the joint surface and let it stand for 24 hours before applying oil.

5. Inspection and Testing
1) Inspection
 After processing, it is necessary to check the dimensional accuracy of
oil ports, threads, counterholes, etc. Steel parts should be
electroplated/blackened, and aluminum parts should be anodized for rust
prevention.
 The clearance between the valve spool and the valve hole is 0.005-
0.035mm, with a tolerance of 0.002-0.008mm for roundness/cylindricity.
2) Performance Testing
 Before debugging, the circuit needs to be flushed for 10-20 minutes to
verify reliability through withstand voltage testing and functional testing.

Based on the above materials, processing, surface treatment, and inspection
process specifications, the functionality and durability of the hydraulic
manifold blocks produced by AAK is ensured.

AAK HYDRAULIC VALVES (842) 2025-03-05

Minimum Order: 1 sets

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