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The Blackhall submerged discharge valve is suitable for applications when low discharge noise is a requirement and / or when space is at a premium.
The valve is designed so that the discharge occurs underwater into a stilling well reducing both noise and the space required (a stilling basin is not needed). Details of the sizing for the valve and stilling wells are available from Blackhall Engineering.
This type of valve can also be known as a vertical sleeve type valve. The Submerged Discharge valve offers a quiet and compact discharge footprint. Typically used in dams and reservoirs to substantially increase their drawdown capacity in emergency situations where space is at a premium.