GN 1150-FH Latches Operating side in Hygienic Design (front hygiene)

Stainless steel latches GN 1150 are intended for use in hygienic areas and meet hygiene requirements on the operating side (front hygiene) and on the operating and latch arm side (full hygiene) due to the special mounting nuts as well as the optimized latch arm and hexagon head screw. The locking mechanism is protected by two seals (front hygiene) and multiple seals (full hygiene). At the same time, the high surface quality (Ra < 0.8 µm) and dead-space-free mounting prevent dirt from adhering and facilitate cleaning.

The latches create a secure closure by rotating a maximum of 90°, which positions the latch arm in the locked position behind the frame. Slanted surfaces on the latch arm ensure smooth positioning. Latch arms are available with different bend angles to cover a latch arm distance A from 6 to 28 mm (front hygiene) and 22 to 44 mm (full hygiene).

The mounting 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. Stainless steel latches GN 1150 (front hygiene) are supplied with loosely enclosed latch arm.

• GN 7600 Sealing Rings
• GN 7607 Wipers
• GN 1151 Socket Keys
• GN 3124 Sockets

• IP Protection Classes 

• Plastic Characteristics 

• Stainless Steel Characteristics 

For installation, set a bore diameter in the door, cover or hatch as shown in the outline drawing opposite.

The latch housing is inserted into the installation bore from the front and secured from the back with the mounting nut. Then the latch arm is secured with the hexagon head screw.

In series production, the required installation bore in the door leaf is usually created by punching or laser cutting.

The installation bore diameter can also be created by drilling or milling as shown in the outline drawings.

The sheet metal punch GN 123 is also available for small series production and sheet steel with a thickness < 2 mm.

Construction note for d1 = 22	Construction note for d1 = 30
Bore distance
Installation bore for punching or lasering
Installation bore for drilling or milling

Hygienic Design

Elesa+Ganter has solutions

The Hygienic Design product family

Why Hygienic Design?

Advantages of Hygienic Design

• 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 1672-2:2021-05

Food machinery – General design principles – Part 2

Design requirements for Hygienic Design

• Non-rusting Stainless Steels

• FDA and EU compliant plastics and elastomers

• 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

• 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

• 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

• Active participation in national, European and international standardization efforts. Prevention of work accidents, occupational illnesses and work-related health risks

• European Machinery Directive (98/37/EC), plus the German Appliance and Product Safety Act (GPSG)

• Testing of parts and machines, issuing of certificates

Seals

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.