Beloit Headbox Attenuator (New Spare) – SOLD!

Apparatusforattenuatinglowfrequencypressurevariationsina stock suspensionbeingfedtoapapermachine.Theapparatusincludesapressurizedoverflowchamberhavinganinletwhichdeliversa stock suspensionthereinandanoutletfordischargingstockfromthechamber.Afirstcontrolmeanscontrolsthepressureappliedtothe suspension intheoverflowchamber.Thechambercommunicateswithasumpwhichreceivestheoverflowfromtheoverflowchamber.Asensingmeanssensesthestockpressureintheinletconduitandasecondsensingmeanssensesthelevelofstockinthesump.Ahighpassfilterreceivesasignalfromthefirstsensingmeansandalowpassfilterreceivesasignalfromthesecondsensingmeans.Asummingamplifierreceivestheoutputofthehighandlowpassfilters.Acontrolmeansreceivestheoutputofthesummingamplifierandisconnectedtotheoverflowmeanstocontroloperationofanoverflowvalveinresponsetotheoutputofthesummingamplifier.