A plastic valve comprising a valve body, integral plastic valving duct means with rigid tubular plastic end portions for attachment to flow ducts carrying liquids to be valved, and a collapsible and distensible tubular plastic valving portion welded to the tubular end portions, the valving portion have...http://www.google.fr/patents/US5297773?utm_source=gb-gplus-shareBrevet US5297773 - Plastic valve with flexible tube and tube squeezing apparatus
Plastic valve with flexible tube and tube squeezing apparatus
