AVK valves ensure reliable supply for Athens water utility

Athens water utility (EYDAP) is renovating the largest water treatment plant in Athens. AVK valves have been used for the project.

With a daily capacity of 800.000 m3, the water treatment plant in Acharnai, Greece, is crucial for a reliable supply of drinking water to the citizens of the Attica region. The plant was constructed in 1972 and had not been renovated since 1992. An upgrade was therefore necessary, as the city is continuously developing and the population is still growing. Also, there was need for implementation of a sludge treatment plant for the process of sludge and the backwash stream.

A long stainless steel pipe collects sludge from the 16 rectangular settling tanks, and each outlet duct has a pneumatically operated DN500 butterfly valve opening and closing when necessary to transport the sludge to the new plant. Additionally, there is an isolating double eccentric butterfly valve (DN800) at the collection pipe inlet.

Manually operated centric butterfly valves and double eccentric butterfly valves have also been used during the renovation of the pump station’s main and by-pass lines.

Knife gate valves with non-rising stem and ball check valves are used in the circuits of the sludge processing and dewatering.

Products delivered to the project:

  • 20 x centric butterfly valves, series 820 (DN500)
  • 4 x double eccentric butterfly valves, series 756 (DN800)
  • 8 x dismantling joints, series 873 (DN500 and DN800)
  • 27 x knife gate valves, series 702 (DN80-250)
  • 6 x ball check valves, series 53 (DN100-250)