of water from pipes and vessels associated with a turbine is herein presented and claimed the invention includes a two position movable stem having therein a plurality of ducts and the orifice their relative diameters and the flow itself are utilized to prevent blockage of the flow path application_number US 15185980 A description referring now to the drawings in detail like reference numerals refer to like features fig1 shows a flow diagram of a turbogenerator 10 wherein motive steam from a boiler not shown flows through a supply conduit 12 and stop valve 14 to a turbine 16 and is exhausted to a condenser 18 extraction or bleed steam is withdrawn from the motive steam through extraction piping or conduit 20 to some intermediate stage of the turbine 16 in order to provide the steam for feedwater heater 22 which heats the condensate being returned to the boiler a drain pipe or conduit 24 is disposed between the extraction piping 20 and the condenser 18 and contains a self cleaning orifice assembly 32 which will be described in detail hereinafter condensate collected in a hot well 26 of the condenser 18 is pumped from the condenser 18 to the feedwater heater 22 by a condensate pump 28 the condensate then flows through the tubes of the feedwater heater 22 and is picked up by.