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nonreturn valve

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.03 sec.
nonreturn valve [¦nän·ri′tərn ‚valv]
(mechanical engineering)


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Of course, if you spot broken or chipped flights or nicks in the nonreturn valve or screw tips, these are likely sources of black streaks and must be replaced.
On the other had, a screw speed that is too fast can mechanically destroy the nonreturn valve when molding high-viscosity materials on a screw with a relatively long metering section.
However, a special screw with nonreturn valve in lieu of the smear tip is available for BMC processing, reportedly providing excellent shot control without damage to reinforcing fibers.
 
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