VALVE ASSEMBLY

摘要

An inlet valve assembly (14) for a high-pressure fuel pump is disclosed. The inlet valve assembly comprises an inlet valve member (28) moveable between open and closed positions to control the fuel flow from a source (24) of low-pressure fuel to a pumping chamber (16) of the fuel pump, a first biasing spring (70) arranged to apply a first force to the valve member (28) in an opening direction, a second biasing spring (74) arranged to apply a second force to the valve member (28) in a closing direction, and an actuator arrangement (50) operable to remove the first force from the valve member (28), thereby to allow the valve member (28) to move into its closed position.