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Logical expression of engineering drawings

2017-05-12View Original

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Figure bottom E: HIC3207.2OC/UY3207/D-S-OC/PFP15/119. What is the difference if E is replaced with C? Here, OC stands for on or off; what does the entire logical expression mean? Additionally, the actuator of valve TV3207 is clearly manual; yet it is actually possible to control its opening degree via a computer. Why is that?

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