The vent valve comprises an air ventscrew, a spring and a valve ball which leans against the channel under the acting force of the spring.
所述排气阀包括一排气螺钉、 一弹簧、一钢球，阀球在弹簧作用力下抵靠通道上。
2
Supply oil to the fuel oil system by hand oil supply pump and release all the air through the injector pump and fuel injector's ventscrew until the oil overflows and no more air found.