Sealing technology manual for the process industry - Seals for pipe connections

SEALS FOR PIPE CONNECTIONS Freudenberg offers different models for static seals in standardized pipe connections used in the food, chemical and pharmaceutical industries. These four different models are available: • The classic seal for dairy couplings in compliance with DIN 11851 • Clamp seals in compliance with DIN 32676 and ISO 2852 • O-rings for aseptic clamp connections in compliance with DIN 11864 • Flat gaskets in compliance with DIN 28091-2 and DIN 28091-3 Seals for dairy couplings can be used to easily connect and seal pipe connections for liquid media. The dairy couplings standardized according to DIN 11851 are very common in the food and beverage industry. Their essential advantage is the extremely quick and easy installation thanks to their simple separation from the flange, so that they can also be frequently disassembled without difficulty. Dairy couplings are an economical solution and are particularly suitable for smaller plants not operating continuously. However, it should be taken into account that this seal component is best suited for less demanding applications. Consequently, seals for dairy couplings do not meet Hygienic Design re- quirements, since compression is problematic due to the lack of metallic stops, and the formation of gaps into the product area could occur. Seals for dairy couplings are avail- able in various materials, from NBR, EPDM, FKM to VMQ and PTFE, for a maximum operating pressure of up to 40 bar. Dimensions • Standard form, with lip, and high version • Standard dimensions from DN 15 to DN 100 DESIGN NOTES General Adhere to the relevant standards Surfaces As laid out in the relevant standards, inner surfaces that come into contact with media R ≤0.8 µm Material • FDA-compliant • Hardness between 75 and 85 IRHD • Homogeneous material • No damage during deflashing • No visible inclusions or pores allowed Design Preferably clamp seals with aseptic O-rings in compliance with DIN 11864 Preparation • Where applicable, check pipe inclinations for cracking • Ensure proper pipe alignment during assembly Applications Seals for dairy couplings cover a broad range of applications for the sealing of pipe connections: • Suitable for use in a wide variety of pipe connections in the food, beverage and pharmaceutical industries • Ideal for flange connections that need to be opened on a regular basis • Used in non-critical media THE ADVANTAGES AT A GLANCE • Standardized sealing element • High density of use • Especially fast and easy assembly, regardless of the direc- tion of installation • Can be removed quickly • Available in numerous approved material variants Standard With lip High version Seals for dairy couplings Product portfolio 70

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