Pump seal injection control

Claim 1

IN COMBINATION WITH A PUMP FOR FLUIDS AT ELEVATED TEMPERATURES HAVING A CASING DEFINING A PUMP CHAMBER, A PUMP SHAFT EXTENDING THROUGH THE CASING FROM THE CASING, AND A WET SEAL IN THE CASING ENCIRCLING THE SHAFT PROVIDING A PAIR OF SPACED RESTRICTIONS AND BEING SUBJECT TO A HEAD OF HOT FLUID AT ONE END WITH A DRAIN AT ITS OTHER END FOR LIMITED FLOW OF FLUID THERETHROUGH FROM THE PUMP CHAMBER; A SYSTEM FOR CONTROLLING FLOW OF FLUIDS AT ELEVATED TEMPERATURE THROUGH THE SEAL, COMPRISING: (A) AN INLET ADAPTED TO RECEIVE COLD FLUID CONNECTED TO THE CASING IN COMMUNICATION WITH THE SEAL INTERMEDIATE ITS RESTRICTIONS AND HAVING SIGNAL RESPONSIVE MEANS FOR CONTROLLING FLOW OF COLD FLUID THERETHROUGH, (B) MEANS OPERATIVELY ASSOCIATED WITH THE INLET AND DRAIN FOR SENSING FLOWS OF COLD FLUID AND SEAL DRAINAGE AND FOR PROVIDING SIGNALS REPRESENTING THE SECOND FLOWS, AND (C) REGULATOR MEANS CONNECTED TO THE SENSING MEANS TO RECEIVE SIGNALS REPRESENTING SENSED FLOWS AND CONNECTED TO THE FLOW CONTROL MEANS TO PROVIDE ACTUATING SIGNALS THERETO IN RESPONSE TO SIGNALS REPRESENTING SENSED FLOWS TO CONTROL FLOW OF COLD FLUID TO THE SEAL FOR CONTROLLING FLOW OF FLUID THERETHROUGH FROM THE PUMP CHAMBER.