How does Chinese OEM Hydraulic Screw-in Cartridge Valve Manufacturer AAK inspect the quality of the Hydraulic Screw-in Cartridge Valves?

For each hydraulic Screw-in cartridge valve, hydraulic cartridge valve manufacturer AAK conducts very strict quality inspections from raw materials to shipment, and the inspection processes is roughly as follows:

1. Raw material inspection

The raw material manufacturer provides material analysis reports to hydraulic cartridge valve manufacturer AAK, and AAK regularly entrusts third-party organizations to conduct material analysis.

2. Inspection of purchased finished products outside

For some components that hydraulic cartridge valve manufacturer AAK purchased outside, such as the coils, O-Rings, TPE back-up rings etc, the component manufacturer provides material reports and inspection reports to AAK, and AAK conducts size sampling before storage.

3. Self made semi-finished product inspection

For each component that is produced in our own factory, hydraulic cartridge valve manufacturer AAK inspects the full size of the first piece, then run into mass production. During production, process full-size inspection; After production, process full-size inspection according to proportion randomly.

4. Inspection after heat treatment

Key dimensions are randomly inspected, and the outsourced heat treatment manufacturer provides hydraulic cartridge valve manufacturer AAK a metallographic analysis report. AAK conducts metallographic analysis on each batch of outsourced heat treatment materials through sampling in a third party.

5. Inspection of self-made finished products

Full inspection of precision machining dimensions, grinding and matching.

6. Assembly inspection

Random inspection

7. Finished product testing before shipping

All products must pass 100% performance testing before being stored or shipped.

8. Delivery inspection

Fully inspected shipped materials consistent with the order requirements.

9. Fatigue Test

Each product is scheduled to undergo durability testing, record and track relevant data, and mass produce after passing the inspection.

AAK HYDRAULIC VALVES (843) 2025-03-11