A ball check valve is a simple and reliable valve in which the only moving part that blocks reverse flow is a circular ball. The full-ported valve seat is uniquely designed to allow the ball to sit in a leak-tight seat without a wedge in the valve seat.
For vacuum or anti-flood valve applications, a “floating” ball is used instead of a “sinking one”. Due to its simple flow efficient and virtually maintenance-free design the valve is commonly specified and used in submersible wastewater lift stations.
Ball check valves have a ball that sits on the seat, which has only one hole. The diameter of the ball is slightly larger than the diameter of the through-hole (seat). When the pressure behind the seat exceeds the top of the ball, the liquid is allowed to flow through the valve.
When the pressure above the ball exceeds the pressure under the seat, the ball returns to rest on the seat, creating a seal that prevents it. The ball moves up and down inside the valve depending on the flow and seals against the machined seat when there is no flow or reverse flow and seals against the seat to prevent reverse flow.
Petron Thermoplast offer Ball Check Valves which have balls as standard and corrosion resistant balls for abrasive media. These valves are generally preferred for use in pumping stations because they are self-cleaning as the ball rotates during operation and is free from vertical maintenance.