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GN 8170

Stainless Steel-Indexing plungers

Stainless Steel, DGUV Certified, Hygienic Design, Knob Side (Front Hygiene) / Knob and Pin Side (Full Hygiene)

GN 8170-FH

Stainless Steel-Indexing plungers
Knob side Hygienic Design (front hygiene)

GN 8170-VH

Stainless Steel-Indexing plungers
Knob and pin side Hygienic Design (full hygiene)

GN 8170-FH

Stainless Steel-Indexing plungers
Knob side Hygienic Design (front hygiene)

Types

  • Type B: without rest position
  • Type C: with rest position

Identification

  • FH: Knob side Hygienic Design (front hygiene)
  • VH: Knob and pin side Hygienic Design (full hygiene)

Stainless Steel

AISI 316

Plunger pin case hardened

Spring

Stainless Steel AISI 316Ti

Seals, blue, FDA compliant temperature resistant -25 °C to +110 °C

Sealing ring

Hydrogenated acrylonitrile butadiene rubber H

Hardness 85±5 Shore A

Wiper

TPU

Hardness 95±5 Shore A

All moving parts lubricated with FDA-compliant special grease

Both Identifications FH and VH: Indexing plungers with a rest position are used for such applications where the plunger has to stay in its retracted position. In that case, the knob is retracted and afterwards turned by 90°. A notch keeps the plunger in this position.

Identification FH: Knob side Hygienic Design (front hygiene): Stainless Steel-Indexing plungers GN 8170 are intended for use in hygienic areas and meet hygiene requirements on the knob side (front hygiene). Wipers between the knob and the guide as well as the sealing ring between the guide and the housing keep the locking mechanism on the knob side leak-tight. At the same time, the high surface quality and dead-space-free mounting prevent dirt from adhering and facilitate cleaning.

Mounting holes and through-holes in the housing must be at a right angle, free of burrs and without a chamfer. This ensures that the sealing rings will function properly.

Identification VH: Knob an pin side Hygienic Design (full hygiene): Stainless Steel-Indexing plungers GN 8170 are intended for use in hygienic areas, and with their additional sealing nuts, they meet hygiene requirements on the knob and pin sides (complete hygiene). Wipers between knob and guide and between guide and pin as well as sealing rings on the guide and sealing nut keep the locking mechanism leak-tight. At the same time, the high surface quality and dead-space-free mounting prevent dirt from adhering and facilitate cleaning.

Through-holes in the housing must be at a right angle, free of burrs and without a chamfer. This ensures that the sealing rings will function properly.

The Stainless Steel-Indexing plungers GN 8170 are certified according to DGUV Test.

Why Hygienic Design?

In the food industry, medical technology and the pharmaceutical industry, product safety and consumer protection are becoming increasingly important. Due to their specific properties, standard parts in Hygienic Design can assist the production process in these sensitive areas and facilitate the manufacture of products with a long shelf life, which are free from preservatives.

Advantages of Hygienic Design

Less and shorter cleaning work (this can be up to 25 % of the production time), therefore

  • more time available for production
  • less fresh water consumption
  • lower energy consumption
  • less cleaning agent required
  • less production of waste water
  • lower total costs and saving of resources

Legal basis of Hygienic Design

EN 1672-2:2009 “Food machinery”

Machines must be able to be cleaned, i.e. they must be designed and constructed so that dirt can be removed with the recommended cleaning methods.

Machinery directive 2006/42/EC

Machines must be designed so that

  • materials can be easily and fully cleaned before each use and
  • no risk of infections or illness is created.

DIN EN ISO 14519:2008-07

Hygiene requirements for the design of machines

DIN EN 1672:2009-07

Food machinery – General design principles – Part 2

Design requirements for Hygienic Design

Material

  • Non-rusting Stainless Steels
  • FDA and EU compliant plastics and elastomers

Surfaces

  • Surfaces must be able to be cleaned
  • Steps due to appliance configurations which are not aligned must be avoided
  • Seals must be designed so that no gaps occur
  • O-ring grooves must be hygienically designed
  • Contact with the product to be manufactured must be ruled out
  • Corners should preferably have a radius of 6 mm or more

Design / Geometry

The interior and exterior areas of all appliances, components or piping must be self-draining or be able to be drained and easy to clean.

Surface properties and roughness

Easy to clean with Ra < 0.8 μm

 

Design principles for Hygienic Design

EHEDG

  • European Hygienic Engineering & Design Group
  • non-profit European consortium of machine and food manufacturers as well their suppliers, research institutes, universities and government health agencies
  • approximately 45 guidelines
  • examination of products and issue of certificates

3-A Sanitary Standard, Inc.

  • non profit and independent association in the USA
  • three interest groups:public and governmental health agencies, machine and food manufacturers
  • over 70 Sanitary Standards
  • examination of designs and processes, issue of certificates

Seals

For the standard parts which are listed in Hygienic Design, seals have the central function of protecting dead spaces, gaps and cracks from the penetration of cleaning fluids or product residues.

For this, a defined pre-tension or pressing of the seals and wipers is necessary for a reliable and permanent seal in the installed condition. Within the Hygienic Design product family, seal installation spaces and seal cross sections are calculated and designed with simulation software, so that the necessary surface compression is achieved on installation and the seal material is not subjected to excess pressure.

A fundamental differentiation can be made between static and moving seals:

During assembly, the static seals in the design example shown below are tightened to the mounting surface at the top (sealing ring) and to the contact surface at the bottom (bottom seal). It should be ensured that all surfaces which make contact with the seal have a surface finish of at least Ra 0.8 µm.

The moving seals on the adjustable sleeve (wiper) and the ball joint (joint sealing ring) of the foot are designed so that they allow adjustment in both height and angle. With these too, the installation space together with the cross section of the seal ensures a gap-free, pre-tensioned seal.

Depending on the version and the type of use, it may be the case that seals may need to be replaced in case of damage or for preventative maintenance. For this, Elesa+Ganter supplies the relevant seals as spare parts or offers these under GN 7600 as standard parts for spare parts.

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