Solenoid valve

摘要

A method for operating the solenoid valve of a drop on demand ink jet printer to print a line of ink upon a substrate, which line has a length equivalent to at least three individual printed dots, characterised in that the plunger (1) is held in the valve open position by applying a current to the coil (3) of the valve which current has an amplitude of less than 50% of that required to move the plunger (1) initially from its rest position.