Spindle, adjustable sleeve, foot plate
Seals, blue, FDA compliant
NBR, hardness 70 ±5 Shore A
TPU, hardness 95 ±5 Shore A
Joint sealing ring
H-NBR, hardness 85 ±5 Shore A
Silicon, hardness 85 ±5 Shore A
GN 20 hygienic levelling feet are certified according to 3-A Sanitary Standard, Inc. guidelines and are intended for use in hygienic areas. In addition, the version with mounting holes (type B) is certified according to EHEDG guidelines.
The bottom seal protects the area beneath the foot plate from dirt. For this, the foot must be screwed on using the mounting holes and compressed accordingly. Hygienic fastenings and the correct position of the mounting holes are essential. The sealing ring above the adjustment sleeve enables fastening without dead space. Due to the wiper or the ball seal, the moving components are sealed against the environment.
The high quality finish prevents adherence of dirt and facilitates cleaning.
The values listed in the table for static load capacity refer to a purely vertical load in relation to the leveling foot. Under normal operating conditions bending loads or angular loads are not uncommon and result in a reduction of load capacity, which must be taken into consideration.
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.
Less and shorter cleaning work (this can be up to 25 % of the production time), therefore
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
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 / 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
3-A Sanitary Standard, Inc.
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.
With the example of a GN 20 Hygienic Design levelling foot, the illustrated design shows how the various seal configurations can be designed.
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