Fuel flowmeter having an improved regulator device

A fuel flowmeter for being fed by a pump including an inlet and an outlet, the flowmeter comprising:

• a metering valve including an inlet and an outlet and arranged downstream from the outlet of the pump;
• a return circuit connecting the inlet of the metering valve to the inlet of the pump;
• and
• a pressure regulator device comprising:
• a movable valve member configured to close and open the return circuit;
• a pressure difference detection surface fastened to the valve member and axially separating a first chamber in communication with the inlet of the metering valve from a second chamber in communication with the outlet from the metering valve;
• a first spring arranged in the second chamber while being fastened to the detection surface as to exert axial thrust on the valve member in a direction tending to close the return circuit;
• a piston axially separating the second chamber from a third chamber connected to the outlet of the metering valve, the piston including a coupling member configured to co-operate with the valve member;
• a second spring arranged in the third chamber while exerting axial thrust on the piston tending to keep the piston decoupled from the valve member;
• and
• a channel putting the second chamber in communication with the third chamber.