Upon installation, a hand-tightened union nut serves to compress the face-seal of a Chemtrol valve.
一旦安装完毕，手动旋紧的管接螺母就紧压着Chemtrol阀门的密封面。
Upon installation, a hand-tightened union nut serves to compress the face-seal of a Chemtrol valve.
在安装期间，手动紧固管接螺母用来压紧Chemtrol阀门的表面密封。
Upon installation, a hand-tightened union nut serves to compress the face-seal of a Chemtrol valve.
在安装期间，手动紧固管接螺母用来压紧Chemtrol阀门的表面密封。
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