Patent ID: 6749130
Filing Date: 2004-06-15
Classification: F02M,Y10T

Abstract:
A valve unit comprising:a needle valve member; a control valve; a control line extending between the control valve and the needle valve member, wherein a pressurized fluid being applied to the needle valve member via the control valve and the control line to bias the needle valve member into a first direction; a vent passage fluidly connected to the control line between the needle valve member and the control valve; and a valve element disposed in the control line, and being moveable between a first position, at which the fluid connection between the vent passage and the control line is closed, and a second position, at which the fluid connection between the vent passage and the control line is opened, said valve element being controllably moveable between said first and second positions by pressurized fluid applied to the control line via the control valve.