可见流体在针阀与喷嘴出口间隙大的时候其内部旋流强度大。
Fluid can produce strongest internal swirl when the needle is far from the nozzle exit.
通过针阀杆的旋转即可以关闭针阀又可以带动清油器升降，清除喷嘴中的积碳。
The needle valve can be closed through the rotation of a needle stem, and the oil cleaning device can also be driven to lift to clean out carbon deposit in the nozzle.
通过针阀杆的旋转即可以关闭针阀又可以带动清油器升降，清除喷嘴中的积碳。
The needle valve can be closed through the rotation of a needle stem, and the oil cleaning device can also be driven to lift to clean out carbon deposit in the nozzle.
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