The intersection with the vertical axis is the static pressure that is applied with the selected plunger at the operating hydraulic pressure. The static pressure is determined by a force balance on the hydraulic pistons.
The intersection with the horizontal axis is proportional to the dry shot speed achievable at the operating accumulator pressure and with the shot valve fully open. This speed is obtained in the absence of back pressure, that is, without metal in the injection system.
The equation of the machine line is: