Skip to content

20 Big Flowrox Valves Have the Flow Under Control

Flowrox pinch valves PV 500 E01 are successfully controlling the sludge flow in a Polish wastewater plant. Twenty electrically actuated valves were delivered in 2011 to Poland through Danish engineering company Krüger A/S and Flowrox representative Scanrox A/S.

Czajka is one of Europe’s biggest wastewater treatment plants situated in Warsaw, Poland. The plant has the capacity to process wastewater of 2 million people. Area of the plant is 1,2 km wide and 800 m long which equals the size of 74 football fields.

After six pre-settling tanks there are ten aeration pools where the main biological process takes place. Each pool is seven meters deep and contains 37 225 mof the medium. After aeration pools the wastewater is pumped to the secondary settling tanks where the biological sludge settles to the bottom. From there, it flows to the collection chambers through DN700 stainless pipes. Just before the chambers, the pipes are coned down to DN500 to fit the valves. Flowrox valves are controlling the sludge flow which must be as slow as possible to prevent mixing of the medium. From the collection chambers, the medium is gently pumped back to the starting point of the process as the mass contains the cleaning bacteria.

Flowrox valves have been working without any problems since commissioning. Not even a single sleeve has been replaced in 9 years of operation. The end customer, as well as the engineering company, have been very satisfied with the operation of the Flowrox valves.


Flowrox PV500 pinch valves
Not even a single sleeve has been replaced
in these 20 Flowrox valves during over
9 years of operation.

Key benefits

Gentle handling due to living bacteria in sludge

Wide and accurate flow control range

Extended maintenance interval

NOTE: Flowrox sells valve and pump businesses to Neles
NOTE: Flowrox pump and valve businesses sold to Neles