气阀(尤其是进气阀)的下陷,是大功率柴油机工作中普遍存在的一个问题。针对这个问题,除了在设计上提高缸盖和气阀的刚度外,还可采取若干预防措施:1.加装进气管油雾装置或采用曲轴箱与进气管联通装置。2.调整阀和阀座工作面的锥角。3.正确选择阀座装配过盈量。4.增大进、排气阀开启重叠角。此外,本文还介绍了在维护保养方面一些应该注意的要点。 Valve (especially the intake valve) sag, is a common problem in the work of high-power diesel engine. In response to this problem, in addition to the design to improve the rigidity of the cylinder head and valve, but also take a number of precautions: 1. Install the intake manifold oil mist device or the use of crankcase and intake manifold communication device. 2. Adjust the cone angle of valve and seat face. 3. Correct choice of seat assembly interference. 4. Increase the intake and exhaust valve opening overlapping angle. In addition, this article also introduces some points that should be paid attention to in the maintenance.