Diesel generator valve seat is the supporting surface matched with the valve seal cone surface, which together with the valve body ensures the sealing performance, and transfers the heat of the valve head to the valve head.
So, what are the common faults of the valve seat of diesel generators?
The first problem: Cone wear widens or forms grooves.
The reason is mainly due to the constant impact of the valve seat on the valve seat during the working process.
Second problem: spotting, ablation or cracking on the conical working surface.
The reason for this is that the valve seat is washed by high temperature gas (especially the exhaust valve) and chemically corroded.
The consequence of this is that the diesel generator valve is not closed tightly, which will cause the diesel generator cone surface to be too low and should be scrapped.
How to judge the valve seat of diesel generator?
Diesel generator valve seat is a supporting surface used to match with the valve sealing cone. It ensures the sealing performance together with the valve, and also transfers the heat of the valve head. It is an important part of the generator set.
Diesel generator valve seat technical identification method:
Method 1: The valve seat of the diesel generator is cracked or the valve seat is greatly worn, and the cone surface is too low (2mm lower than the plane of the cylinder head) after reaming. It must be scrapped and replaced with a new valve seat.
Method 2: The taper surface of the diesel generator valve seat is worn and grooved, and the pitting or ablation is slight, which can be repaired by grinding. In severe cases, reaming, polishing and other methods are used for repair.
How to check the valve seat of diesel generator?
The valve seat of the diesel generator is a supporting surface matched with the valve sealing cone. It ensures the sealing performance together with the valve, and it also transfers the heat of the valve head. The check method is as follows:
Method 1: Detect the valve-to-valve contact width. This wide, large low-speed internal combustion engine requires 3~4mm, while the high-speed diesel generator requires 1.5~2.5mm of speed. When it is too narrow, the valve and the valve seat will have poor contact, poor heat conduction, and even air leakage. If the width is too large, it is easy to accumulate carbon residue and the valve is not tightly closed, resulting in ablation and leakage of the contact surface.
Method 2: Check the valve seat surface for corrosion, spots, cracks and grooves.
When the ablation depth of the conical working surface of the valve seat increases, and there are deep depressions, spots and other defects, it should be reamed or ground.
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