| 摘要 |
<p>The initial pressure control for a fuel pump, in the vehicle fuel tank (1), has a pressure control valve (8) which leads fuel from the fuel line back into the tank when the valve is open. The valve has two chambers, separated by a membrane with a fluid seal action. The second chamber (14) has a spring which holds the valve closure in the closed position. The second chamber has a second inlet opening (17), linked to the fuel line (3) through a second branch flow line (15) and a switch (16), to adjust different pressure levels in the second chamber. The second chamber has a jet (19) at the second inlet openings, and also a second outlet opening (18) with a jet (20) with a larger diameter than the inflow jet. The pressure drop between the two jets matches the total pressure at the fuel pump (2), and the switch is a 2/2 path valve.</p> |
