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Herzog Needle Type HP Shut Off Nozzle – Pneumatic / Hydraulic actuation

  • Melt flow separation at nozzle orifice
  • Operating pressure: 3000bar at 400°C
  • Proven shut-off with high-speed units
  • Robust, reliable separation
  • Suitable for special applications
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Herzog Needle Type HP Shut Off Nozzle – Pneumatic / Hydraulic actuation

The pneumatically or hydraulically actuated machine needle shut-off nozzles type HP are used in processing of thermoplastics, principally with low viscosity materials such as: PA, PPS, PE, POM,PP.

Download (PDF) : Type HP Brochure

Download (PDF): Type HP Installations & Service Manual

In this nozzle’s favour are:

Cycle time reduction, shut-off at the nozzle orifice, withdrawal while dosing.

Finds application in:

Packaging, automobile and leisure industries, medicinal and electronic equipment.

The assembly integrated actuator (pneumatically or hydraulically activated) controls a nozzle-axis positioned needle via a lever mechanism. The melt flow is therefore process dependently separated at the nozzle orifice. The needle mechanism is constructed in such a way, that with over-pressure an automatic opening of the nozzle is ensured.

Modules for filters, mixers and GAIM-applications complete the range of shut-off nozzle products.


  • Filamentation
  • Air pockets during screw retraction
  • Material leakage when dosing with a withdrawn injection unit
  • Material leakage while vertically injecting

Applicable for special applications such as:

  • Physical foaming
  • Pre-compressing the melt
  • Hot-runner injection moulding (e.g.. containers, pots)

Supported process control:

Actuator piston position sensors (indicates if nozzle is ‘open’ or ‘closed’

Productivity factors:

  • Controlled, clean shut-off of the melt stream
  • Shorter cycle times – increase in productivity
  • Increased process reliability and repeatability
  • Usability with increased back pressure – improved homogenization
  • Add-on capability (on tool side)


  • Filter module
  • Mixer
  • GIT
  • Process monitoring with piston position sensors on the actuator