| 摘要 |
An anti siphon device, comprises a generally tubular body (1) having a longitudinal axis X; an outlet (18). The anti siphon device comprises an inlet; the inlet having an opening adapted to receive a fuel dispensing nozzle (19) the end of which has an outside diameter D, the inlet having a constriction (11a) spaced from said opening along said axis X and having a diameter d less than D. The anti siphon device additionally comprises an obstruction (3), at least a major portion of which is located between the constriction (11a) and the outlet (18). The obstruction (3) tapers outwardly relative to the axis X in a direction from the constriction (11a) to the outlet (18). There is provided a flow passageway (17) extending from the constriction (11a) to the outlet (18) and defined between the obstruction (3) and a wall surface (10b) at least substantially surrounding the obstruction (3), the flow passageway (17) having a minimum width less than the diameter d of the constriction (11a). At least a portion of the inlet is defined by a wall surface (10a) which tapers inwardly in the direction of said axis X to said constriction (11a) and is adapted to support the end of the fuel dispensing nozzle (19). |
