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Lever Shut Off Nozzles


lever shut off nozzlePower actuated needle shut-off nozzles are generally used when processing low viscosity thermoplastics or when you want to run the screw (dosing/metering) while the mould is opening.

For Reliable and Economic Production

Technical Description

The correct nozzle size is determined by several factors including the shot size, material being processed and the Melt Flow Index (MFI). Precise shut-off and reliable closing during screw run are the critical tasks of any needle shut-off nozzle and are the preconditions for trouble-free, economic production. The sole business at Herzog AG is the development and production of needle shut-off nozzles. They all feature a compact and modular design, trouble-free operation and optimized flow paths. Our reliable shut-off systems separate the flow of material at a location best suited for your process. For increased nozzle life we offer a wear resist option that is intended to be used. Options include in-line filters or mixers which are readily available. Additional designs for LIM/LSR and Gas Assisted Moulding (GIT) applications are standard.

What can you expect from the Herzog needle shut off nozzle?


lever nozzle cross sectionGenerally supplied with a single actuating cylinder, duel actuating cylinders are standard options on all of the power actuated needle shut off nozzles. The cylinder is hydraulically or pneumatically powered by the machines control system. A connected lever system closes (under power) or opens and closes (under power) the needle shut-off nozzle. The actuation is integrated in the needle shut-off nozzle subassembly and forms a compact unit. Assembly errors, which occur in the lever stroke setting, force transmission or alignment, are greatly reduced. For safety reasons the nozzle opens automatically should the internal melt pressure reach 600 bar. For ease of access and/or operation the Actuation system can be positioned at any point on the barrel head/adapter (ie:360°).

For further information on lever shut-off nozzles please complete the Enquiry Form.