因此，在调节管接螺母的紧固度时，阀座对球体的压力就一直存在着。

Thus, by adjusting the tightness of the union nut, the squeeze of the seats against the ball would be maintained.

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除非完全平行或垂直于阀体，或者不要在任何位置用手调整管接螺母。

Do not adjust the union nut with the handle in any position other than fully parallel or perpendicular to the body.

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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.

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