F/F G1-1/2" ball check valve

Valve location in the pumping station

The primary purpose of the valve is to prevent pumped wastewater from flowing back, so it is installed downstream of the pump on the discharge riser, before the shut-off valves. With this solution, if the valve needs to be cleaned or replaced, it is sufficient to pump out the wastewater and close the shut-off valve. Working on the valve under these conditions will be much easier.

If a ball check valve is installed in a wet well where there is a risk of contact with wastewater, it is best to install it above the medium level so that it is not submerged. If the valve frequently comes into contact with the medium because of the tank's small dimensions, it is much safer to install it below the lowest wastewater level, so that it passes through the wastewater–air interface as little as possible. In the absence of air, any corrosion processes that may occur will last much longer than during continuous submersion and drying.

When two or more pumps operate in a tank, ball check valves not only prevent pumped liquid from flowing back into the tank, but also prevent liquid pumped by one of the pumps from flowing back through the other. Without check valves, when one pump operates, wastewater returns through the other discharge riser. This causes significant losses of energy and time and results in very inefficient operation of the pumping unit.