Ultra-Micro Precision Pneumatic Grinding with Fast Cycle
Equipped with a high-stable 2 × 3 ball pneumatic chuck for instant high-rigidity valve clamping. Full valve face grinding finishes within 5 minutes, delivering ultra-tight roundness control down to 0.005 mm on the VG100A and 0.015 mm on the VG100. The intuitive operation requires no specialized training to achieve consistent top-tier machining results for daily overhaul batches in engine remanufacturing workshops.
Full-Coverage Machining Compatibility for Diverse Engines
Covers broad processing specifications: 4.5 – 14 mm valve stems, 20 – 102 mm valve heads and adjustable 15° – 55° grinding angles. It handles gasoline, diesel, passenger car, commercial vehicle and industrial machinery valves uniformly. The universal fixture layout adapts to mixed fleet repair tasks without frequent accessory replacement, making it an essential valve grinding machine for versatile engine repair centers.
Industry-Leading All-in-One Valve Refacing Workhorse
Integrating centering correction, pneumatic clamping and high-precision conical grinding, the VG100 series sets new benchmarks in speed and accuracy for valve refacing. Widely deployed in engine remanufacturing factories, cylinder head repair centers and diesel service shops, it cuts rework frequency, boosts combustion efficiency and prolongs overall engine service lifespan. A dedicated 3 L coolant system and 6 bar air supply ensure continuous stable operation.
Scientific Centerline Alignment Eliminates Eccentric Grinding
Adopting a professional centerline correction system, the VG100 / VG100A aligns the valve face concentrically with the valve stem segment running inside the guide. Heat-induced deformation only occurs on the valve head above the guide; this machine perfectly rebalances warped valves to avoid eccentric grinding, restoring original coaxial precision for leak-free engine sealing in professional valve refacing and engine rebuilding operations.
Technical Specifications
| Type of drive system | Air / Electric | |
| Valve stem diameter range with chuck | 4.5 – 14 mm (0.18 – 0.55″) |
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| Valve stem length range with chuck | 54 – 260 mm (2.13 – 10.2″) |
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| Valve head diameter range | 20 – 102 mm (0.79 – 4.02″) |
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| Valve total length range | 90 – 315 mm (3.54 – 12.4″) |
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| Valve head grinding angle | 15° – 55° | |
| Valve stem butt grinding angle | 0° and 45° | |
| Valve head grinding wheel diameter | 178 mm (7.01″) |
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| Valve stem butt grinding wheel diameter | 76 mm (2.99″) |
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| Valve / butt grinding wheel speed | 3,500 rpm at 50 Hz; 4,200 rpm at 60 Hz | |
| Chuck rotation speed | 50 – 230 rpm | |
| Working accuracy | VG100 ≤ 0.015 mm (0.006″) |
VG100A ≤ 0.005 mm (0.0002″) |
| Coolant capacity | 3 L | |
| Required rated air pressure | 6 bar (85 psi) |
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| Grinding wheel motor power | 0.37 kW | |
| Chuck rotation motor power | 0.09 kW | |
| Overall dimensions of machine (L × W × H) | 945 × 650 × 430 mm (37.2 × 25.6 × 16.9″) |
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| Overall dimensions of tools cabinet (L × W × H) | 700 × 380 × 810 mm (27.6 × 15.0 × 31.9″) |
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| Package size of machine (L × W × H) | 930 × 710 × 690 mm (36.6 × 28.0 × 27.2″) |
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| Package size of tools cabinet (L × W × H) | 850 × 550 × 1,070 mm (33.5 × 21.7 × 42.1″) |
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| Net / gross weight of machine | 130 / 160 kg (287 / 353 lbs) |
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| Net / gross weight of tools cabinet | 50 / 70 kg (110 / 154 lbs) |
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FAQ
1. Why is valve stem end grinding necessary during engine rebuilding?
Over time, repeated contact between the valve stem and the rocker arm or tappet can cause wear, pitting, or deformation of the valve tip. Precision grinding restores a flat and uniform stem end, helping maintain correct valve clearance, improve valvetrain operation, and extend the service life of engine components. Proper stem height is essential for accurate valve adjustment.
2. Can the VG100 restore worn or damaged valve stem tips?
Yes. The VG100 is designed to regrind valve stem tips with high precision, removing minor wear, mushrooming, and surface damage while restoring a smooth contact surface. The amount of material removed should always remain within the manufacturer’s service limits to maintain valve integrity.
3. Is the VG100 compatible with different valve sizes?
Yes. The VG100 is suitable for a wide range of intake and exhaust valves used in gasoline and diesel engines. With appropriate collets or clamping accessories, it can process different valve stem diameters, making it suitable for passenger cars, commercial vehicles, motorcycles, agricultural machinery, and industrial engines. Buyers commonly verify collet compatibility before purchasing a valve grinder.
4. How does the VG100 ensure consistent grinding accuracy?
The VG100 uses a high-precision clamping system that securely holds the valve stem during grinding, ensuring excellent repeatability and a uniform grinding surface. Accurate positioning minimizes runout, improves machining consistency, and helps produce reliable valve clearance across every rebuilt cylinder head. High-quality valve grinders emphasize concentric clamping and precision positioning as key performance factors.
5. Why choose a dedicated valve stem grinding machine instead of manual grinding?
A dedicated valve stem grinder provides controlled material removal and repeatable accuracy that cannot be achieved with manual methods. It helps workshops restore valve stem height consistently, reduce setup time, improve repair quality, and support professional cylinder head rebuilding with greater efficiency.
6. If the machine breaks down, how do you provide after-sales support? Do you provide operation videos?
Yes. We provide comprehensive after-sales support, including remote technical assistance, online troubleshooting, operation manuals, demonstration videos, maintenance tutorials, and live video guidance. If replacement parts are required, genuine spare parts can be supplied quickly to minimize downtime and keep your machine running efficiently.
7. Can you issue Certificates of Origin (CO), Form A, Form E, or other export documents?
Yes. We can provide the necessary export documents—including Certificates of Origin (CO) and other preferential certificates such as Form E—in accordance with the trade agreements and customs requirements of the destination country. We can also assist you in preparing commercial invoices, packing lists, bills of lading, and other export documentation.
8. What is your minimum order quantity (MOQ)? Do you support OEM & ODM customization?
Our standard MOQ is 1 machine for most models. We also provide OEM and ODM services for distributors and equipment brands, including custom logos, machine colors, nameplates, voltage, packaging, and other specifications to meet your market requirements.
9. Which shipping ports do you use? Can you deliver to my designated warehouse?
We typically ship from major Chinese ports, including Shenzhen, Guangzhou, Ningbo, and Shanghai. We can also arrange delivery to your designated warehouse, freight forwarder, or project site through flexible international shipping solutions.
10. How long does delivery take to my country?
Production typically takes 7–35 days, depending on the machine model and order quantity. Shipping time varies by destination and transportation method. Once your order is confirmed, we will provide a detailed production schedule and estimated delivery time.
