Expansible tube valve

An expansible tube valve comprising:

• inlet and outlet body end members, each with a flow passage therethrough;
• a core of circular cross-section between said end members with opposite open ends thereof aligned with said flow passages;
• said core having two axially spaced series of inlet and outlet through openings therearound, a barrier thereacross intermediate said through openings, and a sealing surface around said barrier;
• an elastomeric expansible tube on said core having an intermediate sealing portion normally snuggly embracing said sealing surface to block flow and responsive to fluid pressure differential in said flow passages and exterior said elastomeric tube to control flow through said valve;
• and
• a generally cylindrical body tube between said end members around said core and expansible tube;
• the improvement comprising:
• generally cylindrical bosses on said end members around said flow passages projecting inward toward said barrier;
• and
• an enlarged bead of generally circular cross-section formed on each end of said expansible tube normally moderately compressed radially of said expansible tube between said bosses and said body tube to seal around said tube ends;
• and
• means restricting movement of said tube ends axially inward toward said barrier to retain said beads on said bosses.