A Method and an apparatus for providing control parameters to or within a control system for controlling a fuel injection system are described. The inside opening shape of the discharge port is within two tip curved lines drawn by the pair of rotors and coincides with the two tip curved lines at least at one point when fluid starts to discharge. If the encrypted signal is successfully authenticated, the steering lock is unlocked. According to the method, an approximately arc tangential signal is generated in the butterfly-valve connecting signal. The gaming device selects at least one of the symbols on one of the display plates of the first and second set of display plates and displays the selected symbols to the player. The process provides polyethylene with low metal residues and good properties.