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Herzog Bolt Shut Type BHP Shut Off Nozzle – Pneumatic / Hydraulic actuation

  • Excellent colour change properties
  • Operating pressure: 3000bar at 400°C
  • Proven shut-off with high-speed units
  • Robust, reliable separation
  • Compact, interchangeable design
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Herzog Bolt Shut Type BHP Shut Off Nozzle – Pneumatic / Hydraulic actuation

The pneumatically or hydraulically actuated machine bolt shut-off nozzles type BHP are used in processing of thermoplastics.

Download (PDF) : Type BHP Brochure

Download (PDF): Type BHP Installations & Service Manual

Benefits of using this nozzle:

Cycle time reduction, shut-off in the nozzle of the melt-stream while withdrawing or dosing. With the BHP nozzle Herzog has designed a system which allows a single through-going melt flow channel. Therefore a much bigger flow channel is possible and that is responsible for a reduced pressure drop. With this single channel principle the so called ‘Memory effect”  can be avoided. With the single channel system a cleaning of the unit is done within very short time (similar to an open nozzle).

Finds application in:
Packaging, automobile and leisure industries, medicinal and electronic equipment.

The assembly integrated actuator (pneumatically or hydraulically activated) controls a radial positioned bolt via a lever mechanism. The melt flow is therefore process dependently separated. The bolt mechanism is constructed in such a way, that with overpressure an automatic opening of the nozzle is ensured. In contrast to a needle shut-off system, the separation takes place further back. Because of this a longer bore exists between the nozzle orifice and the shut-off unit. For some applications this may not be suitable.

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


  • 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  • Material leakage when dosing with a withdrawn injection unit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

Supported process control:

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

Productivity factors:

  • 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