Solenoid actuated valve assembly

Abstract

A compact fluid flow control valve is provided which effectively and predictably controls the flow of fluid using a minimum number of components to permit inexpensive manufacture and assembly. The control valve includes a one-piece valve plunger guide and stop which extends through an aperture formed in a stator of the solenoid assembly. The valve plunger guide and stop includes an integral guide surface for guiding the valve plunger through reciprocal movement within the aperture of the stator, an integral stop surface positioned for abutment by the valve plunger when in the energized position to define a minimum air gap between an armature and the stator. The one-piece valve plunger guide and stop reduces the number of parts of the control valve to achieve simplicity in structure and lower costs while avoiding the need for a shim to set the minimum air gap. The present control valve also includes a plunger overtravel impact limiting device including a movable valve head and a hydraulic damping device. The hydraulic damping device includes a fluid passage formed between a portion of the valve plunger assembly and the valve housing. The velocity of the valve plunger assembly is substantially decreased as the valve plunger assembly squeezes fuel from the fluid passage during movement of the valve plunger toward the closed position. The plunger overtravel impact limiting device effectively reduces valve seat wear and valve bounce.