Improved check valve

Details Improved check valve Improved check valve

B - Operations, Transporting

29

C

B29C 45/20 (2006.01) B29C 47/58 (2006.01) B30B 11/24 (2006.01) F16K 15/08 (2006.01)

Patent

CA 2741624

A check valve (36, 136) for a screw (24) is provided. The check valve (36, 136) includes a retainer tip (54, 154), operable to be attached to a distal end of a screw shaft (52, 152), the retainer tip (54, 154) defining at least one melt channel (30). A first ring (60) is coaxially mounted to and rotationally-coupled with the retainer tip (54, 154). A second ring (66) is coaxially and slidably mounted to the retainer tip (54, 154), and is operable to rotate relative to the retainer tip (54, 154). The second ring (66) is operable to reversibly move between an open position which permits melt to flow through the check valve (36, 136) and a closed position which prevents backflow of the melt.

Linvention concerne un clapet antiretour (36, 116) pour une vis (24). Le clapet antiretour (36, 136) comprend un embout de retenue (54, 154) pouvant être fixé sur une extrémité distale dune tige de vis (52, 152), lembout de retenue (54, 154) définissant au moins un canal de coulée (30). Une première bague (60) est montée de manière coaxiale par rapport à lembout de retenue (54, 154) et est accouplée en rotation à celui-ci. Une seconde bague (66) est montée de manière coaxiale et coulissante par rapport à l'embout de retenue (54, 154) et peut pivoter par rapport à l'embout de retenue (54, 154). La seconde bague (66) permet le déplacement réversible entre une position ouverte qui permet à la coulée de traverser le clapet antiretour (36, 136) et une position fermée qui empêche le reflux de la coulée.

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