Precision Hydraulic Valves

Construction machinery, injection molding machines, and presses use hydraulic valves to control oil flow direction and flow rate. If the gap between the spool and the valve body is too large, internal leakage occurs. Hayi Technology's precision hydraulic valves include directional valves, check valves, relief valves, and throttle valves. The spool-to-body fit gap is 0.003-0.008mm. Internal leakage is ≤0.5ml/min at 35MPa. For example, an injection molding machine maker had relief valves with unstable pressure. We re-lapped the spool. Pressure fluctuation dropped from 2MPa to 0.3MPa. This case shows hydraulic valve precision decides system stability. Our MOQ is 1 piece.

Precision Grinding and Lapping

Spool and body materials are 40Cr or 20CrMo (carburized to HRC58-62). The spool outside diameter is centerless ground to roundness ≤0.002mm. The body bore is reamed or internally ground to cylindricity ≤0.003mm. After lapping together, the fit gap is uniform. We hold ISO9001:2015 certification. Each valve gets a pressure test at 1.5 times rated pressure and an internal leakage test. Before packing, we do 100% full inspection. We also accept third-party inspection. Our precision hydraulic valves are available in custom specifications.

Many hydraulic systems need non-standard valves. Our custom sample time is 1 day minimum. Batch lead time is about 15 days. Payment: 50% deposit for custom development. Trade terms: EXW, FOB, DDP. During production, we send photo or video updates. If any problem occurs, we talk immediately and improve after we find the cause. We have a dedicated after-sales person. Hydraulic systems and construction machinery have high demand for valves. Our technicians can help you match spool clearance and spring stiffness. You can offer domestic alternatives for hydraulic valves.

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