| 摘要 |
In an applicator device for applying a material such as nail varnish, with a metering pump, provided separately from the feed duct through which the viscous material passes from the container therefor to an applicator member is a pressure compensating duct which can be communicated with a vent passage extending into the interior of the container, to compensate for variations in pressure within the container. A control valve controls both the communication of the interior of the container with the applicator member through the feed duct, and also the communication of the pressure compensating duct with the vent passage. The vent passage is adapted to be closed by a non-return valve opening towards the interior of the container.
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