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原文
Valve caused by fluctuations in the middle part of From the control loop, in addition to all major aspects of fluctuations caused by valve, the middle part there are some fluctuations may be caused by valve. The connection between the various units through shielding or wiring to connect the signal cable, and if a place is not wired the middle of a solid, it may lead to signal fluctuations. Thus, in the middle of all major aspects of the connection can not be ignored, the control circuit in the instrument, any point of connection problems are caused by valve not functioning properly. Especially the various terminals, make sure the connection is secure and reliable.
原文来自：http://www.tiaojiefa.org

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译文：
从整个控制回路来看，除了各个主要环节引起调节阀波动外，中间有的环节也有引起调节阀波动的可能。各个单元之间的连接都是通过屏蔽信号电缆或接线来连接的，如果中间某一个地方接线不牢固，就有可能引起信号波动。因此，在各个主要环节中间的连接都不可以忽视，在整个仪表控制回路中，任何一点的连接出现问题都会引起调节阀不能正常运行。特别是各个接线端子，一定要保证连接牢固可靠。

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