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Apparatusforattenuatinglowfrequencypressurevariationsinastocksuspensionbeingfedtoapapermachine.Theapparatusincludesapressurizedoverflowchamberhavinganinletwhichdeliversastocksuspensionthereinandanoutletfordischargingstockfromthechamber.Afirstcontrolmeanscontrolsthepressureappliedtothesuspensionintheoverflowchamber.Thechambercommunicateswithasumpwhichreceivestheoverflowfromtheoverflowchamber.Asensingmeanssensesthestockpressureintheinletconduitandasecondsensingmeanssensesthelevelofstockinthesump.Ahighpassfilterreceivesasignalfromthefirstsensingmeansandalowpassfilterreceivesasignalfromthesecondsensingmeans.Asummingamplifierreceivestheoutputofthehighandlowpassfilters.Acontrolmeansreceivestheoutputofthesummingamplifierandisconnectedtotheoverflowmeanstocontroloperationofanoverflowvalveinresponsetotheoutputofthesummingamplifier.
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