Butterfly valves for refurbishment activities in water treatment plant In September 2016, AVK Armaturen delivered six double eccentric butterfly valves series 756 in dimensions DN1000 and DN800 for the supply line from the water reservoirs to the clean water pump stations of the Walddörfer Waterworks in Hamburg The AVK butterfly valves with stainless steel seat ring replace the originally installed butterfly valves from the 1980's. The replacement was necessary due to leakage of the old valves. The refurbishment took place during ongoing daily operation of the plant. Next to the butterfly valves four single-shut-off AVK hydrants series 35/31 were installed for the purpose of air release and intake during filling respectively drainage of the pipe system. The access to the valves and hydrant

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