The problem with the valve on the uat side is most of us would use a festo to get a valve large enough. Festos can cause a air leak with negitive pressure. I have to admit I used to do it that way but changed when I noticed air bubbles. As for your pump running away I have it one time in 14 years and it was in the air. On the ground you would be montering it and have a fire extingusher.
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