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1. Product Overview
Hydraulic valve spool and hydraulic valve sleeve are critical core components of industrial hydraulic valves, widely used in servo hydraulic valves, proportional hydraulic valves, directional hydraulic valves and cartridge hydraulic valve assemblies. Adopting professional CNC turn-mill compound machining and precision cylindrical grinding technology, we provide high-precision hydraulic valve core parts with micron-level tolerance control.
With 20 years of precision machining experience for hydraulic valve components, our hydraulic valve spools and sleeves feature ultra-low friction, excellent wear resistance and stable sealing performance. They ensure jitter-free and stuck-free reciprocating movement, effectively reducing hydraulic leakage and extending the service life of the entire hydraulic valve system. We support custom hydraulic valve parts processing and rapid prototyping for hydraulic valve R&D and mass production.
2. Core Machining Precision & Performance
Dimensional Accuracy
• Bore Tolerance: Up to 0.002mm, ensuring uniform fit clearance and minimal internal leakage of hydraulic valve
• Groove & Depth Tolerance: ±0.05mm, stable oil channel structure for consistent hydraulic flow control
• Min Micro Groove: 0.02mm, supports custom throttle and damping grooves for high-precision hydraulic valve regulation
• Surface Roughness: Ra 0.2 after mirror superfinishing, greatly reducing spool movement friction
Geometric Tolerance Control
• Cylindricity/Concentricity ≤0.002mm: No deformation or eccentricity, ensuring smooth high-speed operation of hydraulic valve core
• Perpendicularity ≤0.003mm: Vertical assembly datum avoids hydraulic valve leakage
• Parallelism ≤0.005mm: Standardized oil groove positioning for excellent interchangeability of replacement hydraulic valve parts
3. Material & Heat Treatment Solution
We provide multiple high-strength steel materials and standardized heat treatment to match different hydraulic valve pressure and working conditions:
Material | Hardness | Application |
40Cr | HRC 30–40 | Standard low-pressure hydraulic valve spool & sleeve, cost-effective |
42CrMo | HRC 50–55 | Medium & high-pressure servo hydraulic valve components, anti-fatigue |
Cr12MoV | HRC 50–55 | Heavy-duty high-pressure hydraulic valve parts, high wear resistance |
20CrMnTi | HRC 50–55 | Impact-resistant hydraulic valve core for cyclic load scenarios |
SUJ2 Bearing Steel | HRC 60–65 | Ultra-precision hydraulic valve sleeve, super long service life |
SUS420J | HRC 55–60 | Anti-rust hydraulic valve parts for humid & water-based hydraulic environments |
4. Standard CNC Machining Process
Raw material cutting → CNC rough turning & milling → quenching & tempering stress relief → semi-finish machining → precision internal & external grinding → mirror superfinishing → CMM full inspection & quality confirmation. Strict process control effectively eliminates deformation and ensures high consistency for mass hydraulic valve core production.
5. Product Advantages & Custom Service
• High Customization: Custom non-standard hydraulic valve spool, sleeve and special flow control groove structure per drawings
• Fast Prototyping: Short lead time for hydraulic valve sample development and small-batch trial order
• Stable Mass Production: Complete CNC production lines, fully interchangeable hydraulic valve replacement parts
• Surface Strengthening: Nitriding, hard chrome plating and PVD coating available to enhance wear & corrosion resistance
• Strict QC: 100% inspection on key tolerances, official test reports provided for every batch
6. Application Scope
Widely applied in construction machinery, injection molding machines, automated equipment, new energy units, marine facilities and machine tools. Ideal for servo hydraulic valve, proportional hydraulic valve, directional hydraulic valve, multi-way hydraulic valve and cartridge hydraulic valve core replacement and assembly.
