Gate Valve 6 : A valve with a disk-shaped closing element that fits tightly over an opening through which water passes. This type of valve is typical in dry hydrants
The City of Sand Springs, Fire Department, Fire Glossary, Sand Springs, Oklahoma, USA 2007. http://www.sandspringsok.org/ArchiveCenter/ViewFil e/Item/51, (FrDept - Amer) {475}