The subject matter of the invention is a fuel pump nozzle, with an inlet (2), a discharge pipe (3), a main valve for controlling the stream of liquid between the inlet (2) and discharge pipe (3), a switching lever (4) for actuating the main valve, a first automatic safety shut-off which moves the ma
The subject matter of the invention is a fuel pump nozzle, with an inlet (2), a discharge pipe (3), a main valve for controlling the stream of liquid between the inlet (2) and discharge pipe (3), a switching lever (4) for actuating the main valve, a first automatic safety shut-off which moves the main valve into the closed position if the liquid level in a tank to be filled reaches a filling level sensor arranged in the region of the discharge pipe (3), a second automatic safety shut-off which moves the main valve into the closed position if the liquid pressure at the inlet (2) drops below a minimum value, and a mechanism (13) for prestressing the main valve into the closed position, said mechanism bringing about a variable opening cross section of the main valve depending on the liquid pressure at the inlet (2). According to the invention, the main valve is pressed into the closed position in a tilted manner under the action of the mechanism for prestressing the main valve into the closed position in the full hose mode such that the tightness of said main valve is reduced.
대표청구항▼
1. A fuel pump nozzle, with an inlet (2), a discharge pipe (3), a main valve for controlling the stream of liquid between the inlet (2) and discharge pipe (3), a switching lever (4) for actuating the main valve, a first automatic safety shut-off which moves the main valve into a closed position if t
1. A fuel pump nozzle, with an inlet (2), a discharge pipe (3), a main valve for controlling the stream of liquid between the inlet (2) and discharge pipe (3), a switching lever (4) for actuating the main valve, a first automatic safety shut-off which moves the main valve into a closed position if the liquid level in a tank to be filled reaches a filling level sensor arranged in the region of the discharge pipe (3), a second automatic safety shut-off which moves the main valve into the closed position if a liquid pressure at the inlet (2) drops below a minimum value, and a mechanism (13) for prestressing the main valve into the closed position, said mechanism bringing about a variable opening cross section of the main valve depending on the liquid pressure at the inlet (2), wherein the main valve comprises a valve seat having an axis and the main valve is pressed into the closed position in a tilted manner with respect to the axial direction of said valve seat under the action of the mechanism for prestressing the main valve into the closed position in a full hose mode such that a tightness of said main valve is reduced. 2. The fuel pump nozzle as claimed in claim 1, wherein the mechanism for prestressing the main valve into the closed position has a full hose spring (13). 3. The fuel pump nozzle as claimed in claim 1, wherein the main valve is designed as a conical valve (6) and the valve stem guide (10, 11) is designed such that the main valve is pressed against the valve seat (5) with an asymmetrical distribution of force under the action of the mechanism (13) for prestressing the main valve into the closed position in the full hose mode. 4. The fuel pump nozzle as claimed in claim 1, wherein the sealing pressure of the main valve in the full hose mode is 0.1 to 0.15 bar. 5. The fuel pump nozzle as claimed in claim 1, wherein the switching threshold of the second automatic safety shut-off which moves the main valve into the closed position if the liquid pressure at the inlet (2) drops below a minimum value is 0.15 to 0.25 bar. 6. The fuel pump nozzle as claimed in claim 1, wherein the switching threshold of the second automatic safety shut-off which moves the main valve into the closed position if the liquid pressure at the inlet (2) drops below a minimum value is at least 0.05 bar. 7. The fuel pump nozzle as claimed in claim 1, wherein the main valve has a valve stem guide (10, 11) which tilts under the action of the mechanism for prestressing the main valve into the closed position in the full hose mode and guides the valve stem (7) of the main valve at an angle to the axis of symmetry of the main valve seat (5). 8. The fuel pump nozzle as claimed in claim 7, wherein the valve stem guide (10, 11) is pressed against an abutment (12) in a tilted manner under the action of the mechanism for prestressing the main valve into the closed position in the full hose mode. 9. The fuel pump nozzle as claimed in claim 8, wherein, in the region of the contact surfaces with the abutment (12), the valve stem guide (10, 11) has spacers (28) facing in the axial direction in subregions of the circumference. 10. A valve stem guide for a fuel pump nozzle as claimed in claim 1, with a stem guiding sleeve (10) and with holding regions (11) which extend radially outward from the stem guiding sleeve (10) and are designed to bear axially against an abutment (12), wherein, when the holding regions (11) are pressed against an abutment (12) of rotationally symmetrical design, the stem guiding sleeve (10) takes up an angular position in which the axis of symmetry thereof differs from the axis of symmetry of the abutment (12) of rotationally symmetrical design. 11. The valve stem guide as claimed in claim 10, wherein the holding regions (11) have spacers (28) facing in the axial direction in subregions of the circumference. 12. The fuel pump nozzle as claimed in claim 1, wherein the switching threshold of the second automatic safety shut-off which moves the main valve into the closed position if the liquid pressure at the inlet (2) drops below a minimum value is at least 0.1 bar above the sealing pressure of the main valve in the full hose mode.
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이 특허에 인용된 특허 (6)
Healy James W. (Hollis NH), Fuel dispensing nozzle having transparent boot.
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