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CNC Valve Spools Technical Specifications
| Component Types | Hydraulic Pump Plungers, Engine Valve Push Rods, Medical Dosing Plungers, Solenoid Cores |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, CNC Centerless Grinders, Cylindrical Grinders |
| Dimensional Tolerance | Sliding Diameters: ±0.002mm; General Diameters: ±0.005mm |
| Geometric Tolerances | Straightness: 0.002mm/100mm; Cylindricity: 0.001mm; Coaxiality: 0.003mm |
| Common Materials | SUJ2, 17-4PH, SUS316L, 42CrMo, Tungsten Carbide (tips) |
| Heat Treatment | Through Hardening, Induction Hardening (HRC 58-62 on sliding surface) |
| Surface Roughness (Ra) | Ground Sliding Surfaces: Ra 0.05 - Ra 0.1; Turned Surfaces: Ra 0.8 |
| Machining Features | Micro Center Oil Holes, Precision Radius Transitions, Hardened Tips, Threaded Ends |
| Surface Treatments & Cleaning | Hard Chrome Plating, Nitriding, Black Oxide, Ultrasonic Cleaning |
| Inspection Equipment | Japanese/German CMM, Roundness Testers, Surface Profilometers, Hardness Testers |
High-CNC Valve Spools for Critical Motion and Fluid Control
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Valve Spools for the automotive, industrial machinery, and medical sectors. Plungers and push rods are critical linear motion components used in hydraulic pumps, fuel injectors, engine valve trains, and medical dosing systems. These demanding applications require the components to possess extreme straightness, superior surface finishes on sliding diameters, and high fatigue strength. Even a microscopic deviation in cylindricity or a slight surface defect can lead to excessive friction, fluid leakage, or catastrophic binding under high-speed cyclic loads.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced 4-axis CNC machining centers, and high-precision cylindrical and centerless grinders. The guide bushing technology on our Swiss lathes provides continuous, rigid support to the bar stock, completely eliminating deflection when machining long, slender push rods and plungers. This specialized equipment allows us to turn complex stepped geometries, machine precision radius transitions, and drill center oil holes in a single continuous setup, ensuring absolute coaxiality.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as SUJ2 bearing steel, 17-4PH stainless steel, and 42CrMo alloy steel. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany, verifying hardness, straightness, and dimensional tolerances. We keep innovating to maintain sound business development and warmly welcome domestic and overseas clients to visit our factory and explore custom OEM/ODM cooperation opportunities.
Core Advantages of Xierge CNC Valve Spools
- Zero-Deflection Swiss Machining: Our Japanese Star CNC Swiss-type lathes utilize continuous guide bushing support, enabling the machining of high aspect-ratio plungers and push rods without bending or vibration, ensuring superior straightness.
- Extreme Sliding Surface Finish: Equipped with high-precision CNC centerless and cylindrical grinders, we achieve mirror-like finishes (Ra 0.05) on critical sliding diameters, significantly reducing friction and preventing premature seal wear.
- Superior Fatigue and Wear Resistance: We strictly select SUJ2 and 17-4PH steels, applying precise induction hardening to the sliding tips, providing excellent wear resistance for high-cycle pumping and valve train applications.
- Single-Setup Concentricity: By turning complex profiles and drilling micro center oil holes in one continuous setup, we eliminate secondary clamping errors, maintaining strict coaxiality between the tip and the main body.
- Thermal Deformation Correction: For hardened plungers, we meticulously manage heat treatment and utilize precision grinding post-treatment to correct any micro-warping, restoring exact cylindricity and straightness tolerances.
- Advanced Surface Treatments: We coordinate hard chrome plating or nitriding to create a highly durable, corrosion-resistant surface layer, extending the operational lifespan of plungers in harsh chemical or hydraulic environments.
- 3-Decade OEM/ODM Expertise: Since 1990, we have continuously innovated, collaborating closely with clients to optimize DFM (Design for Manufacturing) for custom plunger assemblies, scaling seamlessly from prototyping to mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of CNC Valve Spools, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive or industrial supply contracts, we are fully capable of processing Irrevocable Letters of Credit (L/C) at sight. For initial prototyping, sample orders, or custom tooling fees, PayPal and Western Union are also available to expedite the process.
Global Logistics & Protective Packaging:
We provide comprehensive end-to-end shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototypes or small batches, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk mass production, we offer highly competitive sea freight (LCL/FCL) and air cargo rates through our trusted global forwarder network. Recognizing that plungers and push rods are long, slender precision components with delicate ground surfaces highly susceptible to bending, pitting, and oxidation, we utilize specialized packaging: each component is individually coated in anti-rust oil and wrapped in VCI (Volatile Corrosion Inhibitor) paper. To prevent point contact and bending, parts are suspended in custom rigid cardboard tubes or closely spaced multi-layer EPE foam slots, packed in sturdy export-grade cartons or wooden cases to ensure zero deformation during international transit.
FAQ
Slender components naturally deflect under cutting pressure. We utilize Japanese Star CNC Swiss-type lathes equipped with guide bushings that provide continuous, close-fitting support to the bar stock right at the cutting point. Additionally, we apply specialized pecking cycles and utilize sharp carbide tooling with optimized shallow depth of cuts to minimize radial forces, ensuring the plungers remain perfectly straight.
Induction hardening the tip of a slender rod can induce slight thermal warping along its length. We account for this by leaving a specific grinding allowance before heat treatment. Post-quenching, we utilize precision CNC centerless grinders to systematically remove the deformed layer, restoring the exact diameter, cylindricity, and straightness tolerances required for smooth operation.
Internal burrs can break off and destroy hydraulic seals. We use specialized gun drills and carbide micro-drills with optimized pecking cycles directly on the Swiss lathes. This is followed by precision back-chamfering tools and rigorous ultrasonic cleaning. For absolute assurance, we can employ thermal energy deburring (TEM) to vaporize any remaining micro-burrs at the molecular level.
Standard hand tools cannot accurately assess these geometric tolerances. We utilize imported Japanese and German Coordinate Measuring Machines (CMM) and precision roundness testers. The component is supported on V-blocks or centers, and the machine traces multiple points along the length and circumference to map straightness, cylindricity, and coaxiality.
For medical dosing pumps requiring extreme corrosion resistance and smooth fluid displacement, we highly recommend 17-4PH or SUS316L stainless steel. After precipitation hardening, we apply precision centerless grinding followed by electropolishing. This creates a frictionless, chromium-rich surface that prevents chemical adhesion and ensures accurate, repeatable dosing.
Yes. For applications requiring extreme impact and wear resistance at the contact point, we can machine the steel body and braze or mechanically press precision-ground tungsten carbide tips onto the ends. We then finish-grind the assembled component to ensure perfect concentricity and tip geometry.
