SAFETY VALVE AND HIGH PRESSURE PUMP UNDERSTANDING THE DITA SAFETY VALVE

摘要

safety valve and high pressure pump comprising said safety valve. The present invention relates to a fuel safety valve disposed in a fuel supply line (7) between a low pressure pump and a high pressure pump (2) which is provided with: a valve body (40) ) defining a cylindrical cavity (41) having a longitudinal geometrical axis (a) and being connected to a duct (30), and a portion (42) of a discharge duct (33) in communication with the cylindrical cavity (41) ; a piston (44) sliding relative to the valve body (40) in the cylindrical cavity (41) along the longitudinal geometrical axis (a); and a spring (46) housed in a variable volume chamber (49) defined by a portion of the cylindrical cavity (41) between the piston (44) and a closure element (47); the piston (44) being supplied with a hollow hole (52) supplied with the fuel entering the variable volume chamber (49) and the valve body (40) being supplied with a fuel discharge hole (56) connecting the chamber of variable volume (49) to the discharge duct (33).