The designer may lower the pressure on the packing by placing a throat bushing in the pump case (Figure).
设计者可在泵壳内放置喉道补心以降低在填料上的压力(图)。
2
Sure to rotate the pump shaft when pouring lubricating grease, in order that the grease can get into packing cavity fully until have grease oozed out from gland.
注入润滑脂时必须旋转泵轴，以使其充分进入填料腔，直到填料压盖端有油脂渗出为止。
3
Packing or seals are used to prevent the pump leaking around the shaft where it emerges from the pump case.