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Model No.: 28200303 YZ485QB
The working conditions of Weichai Yangchai 28200303 valve seat are very bad.
First of all, the valve is directly in contact with the high-temperature gas, which is severely heated and difficult to dissipate heat, so the valve temperature is very high.
Secondly, the valve bears the action of the gas force and the valve spring force, and the inertia force of the moving parts of the valve train causes the valve to be impacted when seated.
Third, the valve opens and closes at a very high speed when the lubrication condition is poor, and reciprocates at a high speed in the valve guide. In addition, the valve is corroded due to contact with corrosive gas in high-temperature fuel gas.