Ball check valves
A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball that moves up and down inside the valve.
The seat is machined to fit the ball, and the chamber is conically shaped to guide the ball into the seat to seal and stop a reverse flow. Because of their clear bore design, ball check valves are commonly used in wastewater pumping station. These valves are not used for installations where there is a high risk of water hammer as they are not particularly fast closing compared to other check valve types. This is mainly due to the ball not being in direct contact with the reverse flow.
AVK offers ball check valves in DN 32-600 with NBR lined ball as standard and with polyurethane balls for abrasive media like wastewater pump station. They can be installed in both horizontal and vertical positions.
The function of AVK ball check valve
AVK ball check valves are self-cleaning, as the ball rotates during operation which eliminates the risk of impurities getting stuck on the ball. The standard ball is designed with a NBR rubber lined metal core, and the rubber hardness is optimized to prevent the ball from getting stuck in the seat. Balls of polyurethane are suitable for abrasive media and when different balls weights are needed to prevent noise and water hammer. A full and smooth bore ensures full flow with low pressure loss and eliminates the risk of deposits at the bottom that could prevent tight closure.
Main features of AVK ball check valves
- Self-cleaning construction, where the ball rotates during operation eliminating the risk of impurities getting stuck on the ball.
- Full bore ensures low pressure loss and minimum back pressure
- Smooth bore eliminates the risk of deposits at the bottom
- Different ball weights available
- In ductile iron or acid-resistant stainless steel
- Compact design and low weight
- Available up to DN 600
