Reliable detection of backwater
using optical probes
Why do certain backwater valves require a specific pipe layout? Many backwater valves are fitted with an optical probe that triggers the motor-driven shut-off mechanism. The shut-off mechanism is activated whenever water reaches the probe. If installed correctly, this only occurs in the event of backwater. However, if the backwater valve, backwater pumping station or hybrid lifting station has been installed too close to a downpipe, splash water may reach the sensor during normal operation and cause the device to close incorrectly.
Settling-in period:
Here's how
The proper functioning of a backwater valve with an optical probe is ensured by inserting a 1-metre-long section of pipe with a minimal gradient between the downpipe and the backwater valve, backwater pumping station or hybrid lifting station. This so-called ‘calming section’ prevents turbulent flow in the vicinity of the probe and thus ‘false alarms’ caused by splashing water. This ensures that the backflow preventer is only closed in the event of backwater.
