Portable Valve Grinder Services

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Valves play a vital role in controlling the flow of air and fuel into and out of the engine cylinders, and their optimal performance is essential for efficient engine operation. Over time, valves can develop pitting, surface irregularities, and wear, which can lead to various issues, including:
  • Reduced engine performance
  • Increased fuel consumption
  • Increased emissions
  • Potential engine damage due to improper sealing
Regular valve grinding ensures that the valves’ surfaces are smooth and properly seated, allowing for optimal airflow, combustion, and sealing. By maintaining the valves in top condition, fleet owners can extend the lifespan of their engines, reduce downtime, and minimize maintenance costs. Traditionally, valve grinding has been performed in specialized workshops or service centers. The process involves disassembling the engine, removing the cylinder heads, and transporting them to the grinding facility. This approach is time-consuming, logistically challenging, and often results in extended downtime for the vehicle or equipment. To address these challenges, Neptunus offers advanced portable valve grinder services. Our portable valve grinders are designed to facilitate precision valve surface grinding on-site, eliminating the need for disassembly and transportation.

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Why choose Neptunus for Portable Valve Grinder Services?


Our portable valve grinder tool deliver unrivaledRead more

Precision and

With pre-calibrated angles and dowel accuracy ofpinRead more


Our cutting-edge equipment,
the PVG
Read more

Comfortable Working

Our equipment operates at minimal noise levels, Read more


Backed by our extensive experience and expertise in the field, we offer reliable andRead more


We possess the capability to effectively restore valve surfaces, eliminating damage and Read more

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Features of Portable Valve Grinding Machinery

  • Easy to Mount: The Portable Valve Grinder (PVG) is designed to be mounted either horizontally or vertically, allowing for convenient setup in various locations, including vices.
  • Preset Angles: Our machines are delivered with fixed angles based on customer specifications, ensuring compatibility with different engine types.
  • Portable in 2 Cases: With just two lightweight cases, each weighing no more than 30 kg, the PVG can be easily transported to the job site, eliminating logistical challenges.
  • Low Weight Unit: The base unit of the PVG weighs around 30 kg and comes equipped with rotation and feeding gear, ready for mounting and operation.

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Advantage of Portable valve grinding by PVG over conventional approaches
(Lapping and lathe)

Our Method Conventional Methods
Aspect Portable Valve Grinding (PVG) Lapping Lathe
Recommended by OEMs Recommended method Barred by almost all OEMs Commonly used
Purpose Grinding for precise contact between valve and valve seat Removal of pitting & surface damages Grinding for surface finish and precision
Disadvantages – May not match quality of other methods <br> – Time-saving (2-4 hours per valve seat) <br> – Single line contact for increased surface area – Not recommended by OEMs <br> – Time-consuming <br> – Potential for user negligence affecting valve guides and stem life – Thermal cracks possible <br> – Operator-dependent precision <br> – Aging machines may hamper quality
Precision Precise Less precise Precise
Impact on Valve Life Improves valve and valve seat contact for enhanced life May compromise remaining salvage life due to pitting allowances May impact salvage life due to thermal cracks
Contact Area Single line contact for increased contact surface area Diffused contact surface Focused contact area
Time Efficiency Time-saving, typically saves 2-4 hours per valve seat Time-consuming, many hours per valve seat Time-consuming, but varies
Safety and Quality Improved quality, safety, and reliability May compromise safety due to user negligence Quality dependent on operator and machine condition

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Technical Specifications of Portable Valve Grinder

Machine Capacity Stem diameter up to mm, Valve disc diameter up to 250 mm
Air Pressure 0,6 – 0,8 MPa (6-8 BAR OR 85-130 psi)
Air Consumption 700 l/min
Weight Basic machine with case: 28 kgs, Accessories with case: 15-25 kgs
Max Dimensions Cases (LxWxH): 415x400x250 mm
Air Hose Connection 12,5 mm (1/2″)
Noise Level 76 dB(A) / 75 dB(C)
Grinding Speed 2 mm/min (along the valve face)

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Grinding Services by Neptunus

Cylinder Honing
Services by Hon A

Our advanced cylinder honing machines, such as the HON A, provide precise and consistent honing operations, ensuring optimal surface finish and cross-hatch patterns.

Valve Seat
Lathe Services

Our valve seat lathe services restore the valve seats to their original specifications, ensuring proper sealing and valve operation.