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I am not expert on EExd motors or standard that is affecting them. I worked mainly with instrumentation but basic concepts are the same. In EExd which is explosion proof housing most severe case. Not sure whether you are in zone 0 or 1 area or temperature class. The main issue is to heat...

" I found some dull surface on commuatator occur consecutively but not all of commutators ,how about this evidence?" Sounds like you might have some type of misalignment between commutators and brushes such as shaft not being prefectly round bent shaft or problem with alignment of...

I do not like butterfly or plug valves for throttling valves. If you can use lined valves and line size is not too big I can recommed the Fisher RSS globe. If line size is not larger than 2" I know of a company that makes a lined v-ball.

Without much process data and your description ie 20" line I have to assume that it is steam line and not super heated. Coriolis will not work no one makes a 20" meter. Plus if we are talking about high pressure steam we have high heat issues that may affect the ability of an...