in questo caso "valve well"

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Note added at 2003-01-30 08:25:48 (GMT)
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sometimes also translated as sump

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Note added at 2003-01-30 08:29:21 (GMT)
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\"The valves in these and several other installations were oriented in themanner of the conventional tainter gate, that is, with the trunnionsdownstream of the skin plate causing the convex surface of the skinplate to face the flow and seal along the upstream end of the valve well.\"

www.usace.army.mil/inet/usace-docs/ eng-manuals/em1110-2-1610/c-1.pdf

\"The project consists of removing the existing approximately 225 linear feet of double wall diesel fuel line from the fuel sensor and valve sump at the head of Pier #2 to the dispenser on Pier #2 to include removal of sump and valve and piping supports.\"

http://www.fbodaily.com/cbd/archive/1999/10(October)/22-Oct-...