A pressure die casting machine having a working cylinder enclosing a working piston adjacent a multiplier cylinder having a multiplier piston slideably mounted therein. The working chamber intermediate the working piston and the multiplier piston is connected to a pressure medium supply line which includes a check valve. The check valve is separated from the pistons and is attached on the outside of the working cylinder and multiplier cylinder so that the pistons are not weakened and the valve is made accessible for maintenance. The supply of pressure medium to the pressure chamber is controlled by a valve arrangement actuable independently of the check valve.
