Hochdruckpumpvorrichtung

A high pressure pumping device (10) having a body (28) provided with a cylindrical seat (29) and a piston (30) mounted in an axially sliding manner in the seat (29) in order to form a variable volume pumping chamber (31); the chamber (31) being in communication with an intake duct (52), via which it is supplied with a fluid, and with a delivery duct (44) along which there is disposed a one-way non-return valve (32) in order to allow the fluid to flow from the pumping chamber (31) along this delivery duct (44); the pumping device (11) further comprising an electrovalve (51) whose opening and closing is controlled, disposed along the intake duct (52) in order to enable the fluid to flow from and to the pumping chamber (31), and a control unit (36) adapted to control the opening of the electrovalve (51) in order to cause a controlled quantity of fluid to flow back from the chamber (31) to the intake duct (52), enabling the regulation of the quantity of fluid pumped, at high pressure, along the delivery duct (44).