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 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。
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