Dump Valve 3 : A valve on a production vessel which opens automatically at high liquid level and closes to stop flow at low liquid level. Usually actuated by float control but may be diaphragm, or electrically operated. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}