Fluid pump e.g. fuel-high pressure pump, for use in fuel system of internal combustion engine, has volume control valve that includes valve mechanism arranged parallel to another valve mechanism in fluidic manner

摘要

#CMT# #/CMT# The pump has a volume control valve (15) arranged between a discharge area (30) of the pump and a low pressure inlet (40) in a fluidic manner. The volume control valve closes connection between the discharge area and the low pressure inlet during a suction phase of the pump, and has a pressure relief valve mechanism (48) that is arranged parallel to a valve mechanism (46) in a fluidic manner. A valve unit of the valve mechanism (48) is hydraulically operated depending on pressure that acts in a closing direction and in an opening direction. #CMT#USE : #/CMT# Used for a fuel system of an internal combustion engine. #CMT#ADVANTAGE : #/CMT# The volume control valve has the valve mechanism that is arranged parallel to another valve mechanism in a fluidic manner, such that the individual valve mechanisms are built smaller, thus allowing shorter switching times due to small masses and hence precisely adjusting discharge flow of the pump with high revolution speed of a drive shaft of the pump. The pump utilizes an electromagnetic actuator for one of the valve mechanisms, such that a magnetic circuit and a solenoid coil are built smaller, thus reducing overall size of the volume control device and the pump and hence reducing thermal dissipation loss to improve efficiency of the volume control valve and the pump. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a detailed view of a fluid pump and a volume control valve. 14 : Fluid pump 15 : Volume control value 30 : Discharge area 40 : Low pressure inlet 46, 48 : Valve mechanisms.