| 摘要 |
A circular valve for installation at the end of the worm conveyor contains a circular bushing and a tip, which are installed with a clearance for passage of polymer melt. In the clearance between the tip and the circular bushing a replaceable bushing is installed. Replaceable bushing can be mounted with a clearance to the circular bushing, with a clearance to the tip or with a clearance to the circular bushing and tip. On external and/or internal surface of replaceable bushing and/or in its body the channels for passage of polymer melt can be made. This bushing can be mounted without no clearance for passage of polymer melt.
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