Normally a Flap Valve or automated pollution control devices [PCD] such as our Flapstopper cannot be opened under a head of of more than a few meters of water due to atmospheric pressure holding it firmly closed, like a giant plug in a bathtub.
The Box valve version of the Falpstopper solves this longstanding battle against the forces of gravity by altering the valves orientation to an off-seat position. The box valve above is one of the many examples that was been shipped and installed in 2020, manufactured from stainless steel and with a tough polycarbonate viewing / service window.
This particular Flapstopper viewed prior to installation, was destined to protect the outfall from the UK’s fist recycling plant for EV batteries from the consequence of a fire and the subsequent generation of toxic firewater and the fitting of this Flapstopper was mandated as part of the site obtaining its waste handling licence.
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