通过改进密封函填料配方解决了活塞杆过热发黑的问题。
The problems such as overheat and blackening of the piston rod are solved by means of improving the composition of packing in the sealing box.
离心泵的基本构造是由六部分组成的，分别是：叶轮，泵体，泵轴，轴承，密封环，填料函。
Basic structure of the centrifugal pump is composed of six parts, namely: impeller, pump, pump shaft, bearing, seal ring, stuffing box.
为了从供应商那招徕报价，最佳价格采购过程取决于招标邀请书，也被叫做投标邀请函，投标邀请书或密封投标。
To solicit offers from providers, the best-price purchase process relies on an Invitation to Bid (ITB), also known as Invitation to tender (ITT), Invitation for Bids (IFB), or Sealed Bids.
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