Valve arrangement

A valve arrangement (28) for use in limiting the pressure of fuel within an accumulator volume of an accumulator fuel system to a predetermined threshold level, the valve arrangement (28) comprising a valve outlet passage (54, 56) for communication with a low pressure drain, wherein the valve outlet passage (54, 56) extends laterally from the valve housing bore (46); a valve housing (30) provided with a valve housing bore (46) for receiving fuel from the accumulator volume and a valve member (58) having a closed position in which it is engaged with a valve seating (52) defined by the valve housing bore to prevent fuel flow from the accumulator volume to the valve outlet passage (54, 56). The valve arrangement (28) further includes a piston member (66); biasing means (62) for urging the valve member (58) towards the valve seating (52) through the piston member (62).