Extruder and tube extruder or metal extrusion press

An extruder that has a press frame, comprising:

• a cylinder bar;
• a counter bar connected to said cylinder bar;
• a movable block receiver holder arranged in the press frame, the movable block receiver holder carrying a block receiver and a movable plunger traverse;
• a main cylinder arranged in the cylinder bar, said cylinder receiving in a cylinder housing thereof a pressing piston;
• a pressing plunger provided at a front end of the pressing piston, the front end of the pressing piston being supported by the plunger traverse;
• an equalization container arranged in the cylinder housing, said container supplying hydraulic oil to the pressing piston by a slide plate provided on a central linkage;
• an actuating drive arranged outside of the equalization container;
• at least two slide rods running at a radial distance from the central linkage, the slide rods each having a first end being secured to a back end of the pressing piston, and a second end being secured to the slide plate;
• and
• a filling valve having a lid-like valve cone is disposed in a transition from the equalization container to the cylinder housing;
• a valve seat for the valve cone in the filling valve;
• wherein the filling valve, in an opening function thereof, is configured to open an annular cross section adapted to a large internal diameter in the transition to the cylinder housing;
• wherein the central linkage is designed as a sliding guide for the slide plate, said guide not being coupled to the pressing piston;
• wherein the slide plate at the end away from the pressing piston is fixed to the at least two slide rods;
• and
• wherein the central linkage is connected to the actuating drive, which, when activated, is configured to either lift off the valve cone from the valve seat or to retract the valve cone into the valve seat.