Cooling of press discs in extrusion presses

Claim 1

IN COMBINATION WITH AN EXTRUSION PRESS, A PRESS DISC TO BE INTERPOSED BETWEEN THE PRESS RAM AND A BILLET WHICH IS TO BE EXTRUDED, AND MEANS FOR COOLING THE PRESS DISC, COMPRISING: A FIRST CONDUIT AND A SECOND CONDUIT, BOTH EXTENDING THROUGH THE PRESS RAM, A FIRST PIPE CONNECTED WITH THE FIRST CONDUIT, A FIRST THREE-WAY VALVE IN THE FIRST PIPE, MEANS FOR SUPPLYING A GASEOUS COOLING FLUID UNDER PRESSURE THROUGH THE FIRST THREE-WAY VALVE TO THE FIRST PIPE, A WATER TANK, MEANS FOR ALTERNATIVELY SUPPLYING COOLING WATER FROM THE TANK THROUGH THE FIRST THREE-WAY VALVE TO THE FIRST PIPE, A SECOND PIPE CONNECTED WITH THE SECOND CONDUIT, A SECOND THREE-WAY VALVE IN THE SECOND PIPE, THIS SECOND THREE-WAY VALVE BEING ADAPTED TO PUT THE SECOND PIPE INTO COMMUNICATION EITHER WITH THE ATMOSPHERE OR WITH THE WATER TANK, AND THE PRESS DISC BEING FORMED WITH DUCTS THEREIN THROUGH WHICH COOLING FLUID CAN PASS FROM THE FIRST CONDUIT TO THE SECOND CONDUIT.