Hydraulic Processing

Sealing Performance

If the hole, shaft or sealing surface is not round, smooth or has a taper deviation → the seal ring cannot be evenly compressed, forming a gap → causing leakage.

Critical sealing surfaces require low roughness (Ra ≤ 0.2–0.4 µm) and strict control of cylindricity and coaxiality.

Friction & Wear

Surface burrs, scratches, or protrusions increase friction, leading to accelerated wear and even failure of seals and valve slides.

Grinding, honing, polishing, or surface treatments (such as hard chroming, electroplating, and nitriding) can reduce friction and improve wear resistance.

Interchangeability & Assembly

High-precision machining ensures that parts from different batches or different suppliers can be directly interchangeable, reducing the difficulty of on-site debugging and the risk of rework, and improving assembly efficiency.

Fatigue & Safety

Irregular chamfers or surface defects can cause stress concentrations, which can easily induce cracks and propagate under high-pressure cycling.

Use appropriate chamfers, ensure a smooth surface, and perform stress relief or surface strengthening treatments when necessary.

Control Accuracy

Deviations in valve core or spool dimensions can alter the flow path cross-section, leading to deviations in flow or pressure characteristics and affecting system response speed and stability.

The clearance between the valve core and the valve sleeve must be strictly controlled, typically ranging from a few microns to tens of microns (depending on design requirements).

Cleanliness & Reliability

Rough surfaces, burrs, or machining residue can dislodge in hydraulic systems, clog oil lines, or damage seals, leading to malfunctions.

Precision machining requires not only controlled dimensions and surface finishes but also ensures that the interior of the part is free of burrs and debris. Ultrasonic cleaning or high-pressure cleaning processes are also used to ensure long-term operational reliability.