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Hi, I am looking for design resources on balanced spool (poppet style) type valves. I have found several MSS standards that I believe may apply - however, I can't find a free version online and it's unlikely that I'll be able to purchase the standards as part of this project. There seems to be...

I've been told that if an explosion proof housing is used, an entire switch can be considered explosion proof, i.e. the same explosion proof certifications can be offered on an instrument that the housing carries. This seems suspect since I know that it is required that companies send complete...