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OK seal seal type sealing means to prevent leakage at the shaft and housing and set the seal types are commonly used packing seals, mechanical seal and dynamic seal. 1. packing, the structure is simple, cheap, easy to maintain, but the leakage volume, large power loss, more general media are sealed for low or reciprocating pumps. In the case of FIG. 5, on both sides of the gas transmission probability by Ye are the same. If Ye along its direction of motion, according to the principle of relative motion, from Ye observe gas up the gas in the opposite direction, coupled with its thermal motion, which ultimately leaves the direction of movement with respect to the right as shown in column 6 FIG. However, in this case, both sides of the gas leaves the column through the transmission probability is the same. When Ye at different rates and direction (forward or reverse) movement which, according to the relative movement, Ye both sides of the gas relative motion Ye can reference numeral 1-5 is described by Figure 7, wherein In either state, on both sides of the gas through the transmission probability Ye are the same. Pana photoelectric _ [] _ ??Edwards vacuum pump repair factory in Shantou Edwards vacuum pump repair by the Campana photoelectric - molecular pump supply service provided. Foshan Edwards vacuum pump repair, Pana photoelectric, Edwards vacuum pump repair facility in Guangzhou Pana Optoelectronics Technology Co., Ltd. (shop1367601917907.1688.com/)2014年全新升级推出的