根据需要和输送介质，可采用机械密封和填料密封两种，且这两种结构具有互换性。
According to needs and delivery medium, can be used two kinds of mechanical seals and packing seal, and the structure of these two kinds of interchangeability.
某些泵不用填料，而用机械密封（图）。
Some pumps use mechanical seals rather than packing (Figure).
分析集输系统所用的机泵增压设备填料密封出现的问题，找出原因，制订机械密封改造方案。
Analyzed problems occurred in filler sealing of pump pressurized device used in gather and delivery system, found out causes and made revamp scheme for mechanical seal.
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