Driven ring-type non-return valve for injection molding
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United States of America Patent
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-
May 12, 1992
Grant Date -
N/A
app pub date -
Feb 26, 1991
filing date -
Feb 26, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A non-return valve for an injection molding machine is provided which includes a conventional tip member threaded into the end of a plasticating screw and carrying therewith an annular valve seat member. An annular check ring receives the tip member. Tang protuberances axially extend from the check ring to rotably engage the retainer end of the tip member. This causes the check ring to couple with the tip member during screw rotation to minimize valve wear while permitting the check ring to axially move relative to the tip member for effecting valve closure by pressure differentials in the normal manner. A ramp surface is provided on the tang protuberances which engages a drive surface on the retainer end of the tip/stud member upon reverse rotation of the screw through a predetermined rotational angle or for a set time to positively close the valve prior to injection.
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