| 摘要 |
A liquid dispensing device in the form of a so-called piston valve for use with a gasoline pump comprises a valve housing having an inlet connected to the pump and an outlet; a valve for controlling the flow of liquid from the inlet to the outlet; a discharge pipe connected to said outlet; and a manually operable operating mechanism for controlling movement of said valve, which operating mechanism comprises adjustable means which can be moved between an engagement position and a free position. In order to avoid the risk of unexpected flow of gasoline when the pump is activated, the movement of the adjustable means between said free position and said engagement position is arranged to take place in dependence upon the pressure of the gasoline at the inlet, and passage means are arranged for equalizing the overpressure at the inlet when the pump is deactivated when the valve is open or if an attempt is made to open the valve when the pump is deactivated and said pressure is sufficient to move the adjustable means.
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