| 摘要 |
<p>A liquid packaging machine includes a filler containing a non-return valve spring-biassed closed. The valve includes a closure member (5) to a stem (6) of which is fixed, a centering spider (8), the spokes of which contain iron members (17). Distributed around the valve housing (1) are horseshoe, permanent magnets (13). During production of filled cartons, the magnet device (13) is positioned so as not to interfere with the movement of the closure member (5). However, when air is to be bled from the filler and/or the filler is to be steam-sterilized, the magnet device (13) is positioned to attract the iron members (17) to open the valve against the spring bias (12).</p> |
