Compact High-Efficiency Valve Refacing Equipment
This professional valve grinding machine is specially developed for one-off repair tasks and small batch valve refurbishment in engine rebuilding workshops. It precisely restores worn valve sealing surfaces, eliminates uneven edges and surface defects, and recovers perfect sealing performance for engine valves, helping extend valve service life and improve overall engine compression efficiency.
Wide Compatibility for Multi-Type Engine Valves
It supports full-range machining of valves for automobiles, tractors, motorcycles and various small engines. Covering valve stem diameters 3.5 – 20 mm, valve head diameters 12 – 100 mm and valve lengths 70 – 450 mm, with an adjustable grinding angle from 10° to 57°, it meets nearly all small-to-medium engine valve refacing demands in professional automotive repair and engine reconditioning centers.
Flexible Adjustable Grinding Performance
Equipped with dual independent drive motors: 750 W 3,600 RPM spindle motor and 180 W variable-speed valve drive motor (120 – 750 RPM). Matched with a 200 mm main grinding wheel and 100 mm cup wheel, plus 90 mm travel stroke for both grinding wheel and valve feed, it enables flexible fine-tuning for different valve workpieces and material hardness, delivering smooth, accurate surface restoration for intake and exhaust valves.
Stable Cooling & Complete Industrial Configuration
Built with a 100 W coolant motor and 4 L coolant tank to offer continuous liquid cooling during grinding, effectively preventing valve thermal deformation and preserving surface metallurgy. It supports dual power supply options (380 V / 50 Hz 3-phase or 220 V / 60 Hz 3-phase) and works under maximum 6 bar air pressure, fully adapting to global workshop power standards and professional engine rebuilding facilities.
Technical Specifications
| Model | LD100A |
| Valve stem diameter (min – max) | 3.5 – 20 mm (0.16 – 0.55″) |
| Valve head diameter (min – max) | 12 – 100 mm (0.47 – 4″) |
| Valve length (min – max) | 70 – 450 mm (2.76 – 17.7″) |
| Angle grinding range | 10° – 57° |
| Main grinding wheel diameter | 200 mm (7.87″) |
| Cup grinding wheel diameter | 100 mm (3.94″) |
| Main grinding wheel width | 15 mm (0.59″) |
| Grinding wheel travel | 90 mm (3.54″) |
| Valve feed travel | 90 mm (3.54″) |
| Spindle motor power | 750 W |
| Spindle motor speed | 3,600 RPM |
| Valve driving motor power | 180 W |
| Valve driving motor speed | 120 – 750 RPM |
| Coolant motor power | 100 W |
| Power supply | 380 V / 50 Hz 3-phase or 220 V / 60 Hz 3-phase |
| Max. air supply | 6 bar (87 psi) |
| Coolant tank capacity | 4 L (1 US gal) |
| Overall dimensions (L × W × H) | 1,050 × 1,000 × 730 mm (41.3 × 39.4 × 28.7″) |
| Net weight | 215 kg (474 lbs) |
Product Video
FAQ
1 What valve-related problems does the LD100A solve?
The LD100A precision valve grinding machine restores worn, pitted, or burnt valve faces to their original sealing quality. It grinds the valve face to the correct angle and surface finish, eliminating combustion gas leaks, compression loss, and poor engine performance caused by deteriorated valve seating surfaces in gasoline and diesel engines.
2 Is the LD100A suitable for both automotive and motorcycle engines?
Yes. The LD100A’s adjustable chuck and variable angle settings accommodate valve sizes from small motorcycle and ATV engine valves to larger automotive and light truck engine valves. This versatility makes it a practical choice for general repair shops and engine rebuilders who service a variety of vehicle types.
3 Why is precision valve grinding important for engine reliability?
The valve face and valve seat form a critical sealing interface that must withstand extreme temperatures, pressures, and repeated impact during engine operation. Precision grinding ensures the correct face angle, a smooth surface finish, and perfect concentricity between the valve stem and face — all essential for reliable sealing, proper heat transfer, and long-term engine durability.
4 What is the difference between valve grinding and valve seat machining?
Valve grinding (performed by the LD100A) restores the valve’s own sealing face to the correct angle and finish. Valve seat machining (performed by a valve seat boring machine) restores the corresponding seat surface in the cylinder head. Both operations are complementary and equally important: a perfectly ground valve must mate with a perfectly machined seat to create a proper seal. Professional engine rebuilding requires both.
5 Why use a dedicated valve grinding machine instead of manual lapping?
Manual lapping (hand-rotating the valve with lapping compound) is slow, labor-intensive, and produces inconsistent results. A dedicated machine like the LD100A grinds the valve face to a precise, repeatable angle and surface finish in seconds, with far better concentricity and consistency than manual methods. For professional-quality engine work, machine grinding is the standard that customers and warranty expectations demand.
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.
