发球筒平衡接管的作用是在通球初始时，出球接口端的阀门未开启前使清管器在发球筒中处于前后压力平衡，不能撞向阀芯。
The balance extension tube functions to retain balanced pressure in front and at the back of the cleaner prior to the opening of the valve to prevent it from impacting the valve core.
渗透性利尿和球 管平衡；
渗透性利尿和球 管平衡；
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