很少有人知道这个回油阀以前,我们这里的单缸柴油机,喷油器的回油管都是直接接到进气管上的,回油直接被吸入气缸参加燃烧。后来我们发现,有些单缸柴油机已把喷油器的回油管接到柴油滤清器上了,并且在管接螺钉内装置了一个回油阀。由于以前的使用说明书和培训教材中没有提到过这个回油阀, Few people know the return valve before, here we single-cylinder diesel engine, fuel injector return pipe are directly connected to the intake pipe, back to the oil directly into the cylinder to participate in combustion. Later on, we found that some single-cylinder diesels had connected the injector’s return line to the diesel filter and a return valve was installed in the header screw. As the previous instructions and training materials did not mention the return valve,