| 摘要 |
The liquid-metering device, which may be fasten on a container (1), comprises a valve unit (10) with a T-shaped body (11), whose arms which are aligned with the valves controlled by springs are connected to an upstream circuit (3) and to a distribution conduit (7) and whose shank is made of a metering unit (50). The metering unit (50) comprises a metering chamber (51) with a metering piston (52) connected by its bottom (15) to the valves. The metering piston (52) is kept in the out position at the end of the stroke by a spring (83); it is movable in a guide (53) one extremity of which is screwed on the bottom (14), the other extremity bearing a push-rod (80, 110) for the metering piston (52). The stroke of the metering piston is determined by washers (87, 90, 100, 105) provided on the guide (53) or by elements (112, 113, 114) engaging the guide (83) and the push-rod (110).
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