Larner-Johnson Valve
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A Larner-Johnson Valve is a mechanism used in dams and water pumping to control the flow of water through large water pipes. It was manufactured in the early 20th century by the Larner-Johnson Company in the USA. The valves are still manufactured in the United Kingdom by Blackhall Engineering Ltd.
In 2009, Blackhall Engineering supplied four 60" bore Larner-Johnson valves to New York City Department of Environmental Protection for the Ashokan Reservoir in upstate New York. Each valve is capable of passing a flow rate of 19 cubic metres/second, which is the equivalent of 19 tons of water per second. The valves control the flow of water out of the Ashokan Reservoir into the Catskill Aqueduct down to New York City.
External links
- Photo of a Larner-Johnson Valve
- "Larner Johnson Needle Valve". Blackhall Engineering. http://www.blackhall.co.uk/prod.php?id_c=14&id_s=19&id_p=58. Retrieved 2009-11-10. - manufacturer page on the valve
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