进排气阀及其阀座是汽车发动机中的重要零件。气阀头部的锥面与阀座的锥面必须严密配合,以保证密封。当然,微量漏气还是允许的,但以不影响气缸压力为限。在发动机总成的技术条件中规定,当利用起动马达使曲轴旋转时,压缩行程的气缸压力应不低于8kgf/cm~2。为此,必须检验气阀与阀座的配合密封性。但过去我们没有检测手段,只好放弃这一项目的检验。 Intake and exhaust valves and valve seat is an important part of the car engine. The conical surface of the valve head and the conical surface of the valve seat must be closely matched to ensure the seal. Of course, trace leaks are still allowed, but without affecting the cylinder pressure limit. It is stipulated in the technical conditions of the engine assembly that the cylinder pressure of the compression stroke should not be lower than 8 kgf / cm ~ 2 when the crankshaft is rotated by the starter motor. To this end, the valve must be tested with the valve seat sealing. However, in the past, we did not have means of detection and had to give up the test of this item.