In the pumping systems, the classic clapper valves suffer the so called clapper hammers, because of the slowness of their closing. The clapper is normally half closed when the water column moves back with large inertia, making this one hits against the body valve even causing the breaking of this piece. In some cases the pieces of the broken clapper reach to the pumps, causing serious damages to themselves.
In this way, when there is no flow pressure, the valve quickly closes because of the effort of the spring.
The valve sealing system is completely watertight to be made though contact between the elastomer and the metal.
• This valves, because of their modern design and larger efficiency, have less casting, with which it is get a
cheaper and stronger product.