Non-return valve for injection moulding extruder screw - consists of single piece ring which can be fitted and dismantled over shaped screw end without using tools

摘要

A non-return valve for the screw of an injection moulding machine has recesses which engage with an end piece (5) fitted to the screw end and so that it rotates with it. The ring shaped valve body (9) always extends beyond the tapered section (6) of the end piece (5) and has groove shaped recesses which mate with flats (7) on the taper (6). The end piece (5) and taper (6) are so proportioned that the valve ring (9) can be fitted and dismantled by moving it over the end piece (5) and taper (6). USE/ADVANTAGE - Non-return valve for exit from injection moulding extruder screw. Single piece construction which can be easily fitted and dismantled and gives good sealing.