The 100 Year Project | New York | Larner-Johnson® Flow Control Valves | Plunger Or Needle Type Valve

60% of the water supply to New York is regulated through Blackhall's Larner-Johnson® Flow Control Valves also known as plunger or needle valves.
Learn More - blackhall.co.uk...
Blackhall's Dam and Reservoir Valves - www.blackhall.c...

[@sbr630]

It would be great if you publish how the valve actually works. Thanks a lot.

[@ryanb1874]

Nevermind. It's been proven simple designs using flat cylindrical plates, w a fraction of inch gap at full open, produces non destructive laminar flow. At thousands of gallons a minute with surface areas of several inches.

[@ryanb1874]

Are these for jets