To raise press head 1 to the required height, steam is delivered from valve chest 2 to pull-back cylinders 3 and pull-back pistons 4 are moved upward by steam pressure. At this, hydraulic fluid is forced out of ram cylinder 5 by ram 6 and is discharged to tank 7 through valve 8. Steam from intensifier cylinder 9 is exhausted to the atmosphere through pipe a. Intensifier piston 10 is in its lower position. To lower press head 1, valve spool 11 is shifted upward, steam from cylinders 3 is exhausted to the atmosphere, and pistons 4 move downward together with press head 1. At this, fluid is drawn in through open valve 8 into ram cylinder 5. When top die 12 lies on billet 13, valve 8 is closed and steam is admitted into intensifier cylinder 9. Intensifier piston 10 moves upward and its hydraulic ram 14 applies pressure to the fluid, actuating top die 12 to perform the pressing operation.
$4276$CHP,HP$