| 摘要 |
<p>A valve device for mounting in the neck of a container for a material to be dispensed, comprising a valve body (1) containing a chamber (2) axially defined on one side by a ring-shaped valve seal (3) that comprises a central aperture, and a valve stem (10) extending through the seal (3) and comprising a dispensing channel (12) with a radial hole (13) extending from said channel to the outer stem surface. Said valve stem (10) is movable within the valve body (1) between a starting position in which the radial hole (13) communicates with the outside of the chamber (2) and an actuated position in which the radial hole (13) communicates with the inside of the chamber (2). The valve stem (10) is biased towards the starting position by a resilient member (5). Said valve stem (10) is made of a moulded material comprising a mixture of an acetal resin, polytetrafluoroethylene (PTFE) and silicone, whereby said valve stem (10) has a low frictional coefficient on contact with said valve seal (3).</p> |
