The rubber duckbill design of the ProFlex™ 750 prevents valve slam and water hammer, even in systems with velocities of over eight feet per second.
A duckbill check valve is a one-piece elastomeric sleeve shaped like a duck’s beak. It allows the forward flow of water with positive differential pressure which progressively opens the valve as flow increases. Reverse differential pressure closes the valve. The ProFlex™ 750 features a full port design that opens with minimal head pressure and closes with any back pressure on the valve.
The Jimmy Smith Wastewater Treatment Plant in Boone, N.C. experienced severe and destructive water hammer with the 16-inch swing check valves on their three influent pumps. The treatment plant sits at an elevation of 3,300 feet and the influent station pumps uphill 80 feet to the plant. The three pumps are connected to a common header. Reverse flow from a high elevation and a pump coming on at the same time created violent hydraulic shock waves.
In another instance, water hammer on a 30-inch valve was so destructive that it broke the concrete wall where the pipe entered the building. Replacing the valve with a ProFlex™ 750 resolved the problem. WW
Proco Products Inc. is a global leader in the design and supply of expansion joints for piping/ducting systems. Learn more at www.procoproducts.com.
