译文：
截止阀安装时要注意流体方向，应使管路流体由下向上流过阀座口，及所谓低进高出，目的是减少流体阻力，使开启省力和关闭状态下阀杆、填料涵部分不与介质接触，保证阀杆和填料涵不致损坏和泄漏。那么是否截止阀都是低进高出呢？ 对于平衡型截止阀用高进低出，不平衡型截止阀用低进高出。 可能是以前国内制造水平不高，大部分都是不平衡型截止阀，结果都是低进高出。所以会有截止阀是低进高出的结论。 进口截止阀高进低出的没有使用过.不过一般国产截止阀和部门进口阀都是低进高出,这样使用有一个好处,就是一般进口端压力较高或温度较高,当关闭截止阀时,出口端可以排空,这样便于对截止阀的填料处进行更换,如果高进低出,如填料处漏了,可能维修起来不容易。

“ Principles of fluid direction valve ”是由提供的国际阀门新闻，译文仅供参考。另外，中国截止阀网还提供相关产品搜索：、、、、等。

原文：
Valve installation should pay attention to the direction of fluid should be made up from the next pipe fluid flowing through the valve seat port, and the so-called low prices, to reduce fluid resistance to opening and closing state of labor-saving stem, some do not fill culvert contacts with the media to ensure the valve stem and packing will not be damaged and leak Han. Does it all at low prices and cut-off valve do? The balanced valve with high-low prices, unbalanced type valve with low prices. Perhaps it was the domestic manufacturing level is not high, most of them are unbalanced type valve, the result is low prices. There would be a cut-off valve is the conclusion at low prices. Imports into the low cut-off valve high out not used. But most of the domestic sector imported valves and valve closing are low prices, so there is a good use is generally higher the inlet pressure or temperature is high, when the closed valve , the exit can be emptied, so easy on the cut-off valve of the padding and replaced, if the high-low prices, such as padding leakage, and may be not easy to repair.