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Put an orifice or limit the valve opening to create high pressure gradient which will lead you to your required sampling flow.

What about a door opened into the vessel? The pressure inside the vessel will not open it, but tight it.

In my plant we use reverse flow to drain the outlet area when it should be washed. We do not have threads on the shaft, but I agree with Slagathor that it makes no difference. In the same sense, the axial force in reverse flow, caused by the water flow, will act downward, like in the forward...

In hydraulic systems joints we do not use Teflon with NPT. In water joints we do. Probably hydraulic joints are more accurated.

World's economic is getting worse from day to day, more employees find themselves without jobs. In that situation, engineers have less force to put ultimate demands in front of their managers, and that may cause less involvement in unpleasant hazards issues. Even goverments can be less...

NPT thread needs no additional sealing like teflon! The tapper angel gives an excelent contact sealing when thread is wrenched to the end.

If you want to compare 2 water heaters, let them work at the same time, one near the other, but not to close! so one won't be a "wind shield" to the other. Give them clean flat surface in the front 5 Meters, to avoid non-equal wind disturbances. Of course, no shadowing on them while...