Slight tapping with a mallet may be required, but do not change the valve stem position.
如果需要，用木槌轻轻敲打，但是不要改变阀杆 位置。
The valve stem and sealing surfaces are completely protected from dirt and corrosion by the stem cap, whether the valve is in an open or closed position.
不管是在阀门开启位置，还是关闭位置，阀杆和密封面有阀杆盖帽的保护，能防止污物入内，防止腐蚀。
The stem can be installed in any position, but if a choice of stem positions exists, good practice dictates that the valve be installed with the stem horizontal.
阀杆可以安装在任何位置，但是如果能够选择阀杆位置的话，实践表明将阀杆水平安装在阀门上是最好的方式。
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