Cutting ring screw connection

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Logo of the German Institute for Standardization DIN EN ISO 8434
Area Screw connections
title Metallic tube fittings for fluid power and general application - Part 1: Fittings with 24 ° cone
Latest edition 2/2008
ISO 8434
Logo of the German Institute for Standardization DIN 2353
Area Screw connections
title Solderless tube fittings with cutting ring - complete fitting and overview
Latest edition 01.2013
ISO -

A cutting ring screw connection is a liquid-tight connection technology for pipes developed for the highest pressures . The also common name Ermeto screw connection refers to the company Ermeto , which developed the screw connections in the 1930s.

  • Cutting ring loose.jpg
  • Cutting ring fixed.jpg

(Cutting ring screw connection before tightening (left) and tightened (right); 1: housing, 2: union nut, 3: cutting ring, 4: tube)

use

Cutting ring fittings are standardized in accordance with DIN EN ISO 8434 (parts 1..4) or DIN 2353 and are mainly used in hydraulics . The components of a cutting ring are: union nut , clamping cone and cutting ring. It has a 24 ° sealing cone and the nut has a metric thread . The screw connections are produced in three series - very light (LL - up to approx. 100 bar), light (L - up to approx. 350 bar) and heavy (S - up to approx. 600 bar).

By tightening the union nut, which tapers conically on the inside, the cutting ring is compressed so that the wedge-shaped inner side of the ring cuts into the pipe wall and creates a tight form fit .

history

The history of the cutting ring fitting began in 1929 when the engineer Hans Kreidel received a patent for the first cutting ring fitting he developed. Two years later, in 1931, the production of the Ermeto (derived from the Greek word “hermetos” = closed, tight) began in Zöblitz / Erzgebirge. In the following 14 years until the end of the war in 1945, Ermeto developed into the market leader in pipe fittings for brake systems and hydraulic heavy industry .

literature

  • Klaus Hoffmann, Erhard Krenn, Gerhard Stanker: conveyor technology. Seventh edition, Oldenbourg Verlag, Vienna / Munich 2005, ISBN 3-486-63059-8 .
  • Hans Jürgen Matthies , Karl Theodor Renius: Introduction to oil hydraulics. 8th edition, Springer Fachmedien, Wiesbaden 2014, ISBN 978-3-658-06714-4 .
  • Gerhard Bauer: Oil hydraulics. 11th edition, Springer Fachmedien, Wiesbaden 2014, ISBN 978-3-658-12343-7 .
  • Gunther Dette (Ed.): Lexicon of gas technology. 4th edition, Vulkan Verlag, Essen 1996, ISBN 3-8027-2537-9 .

See also

Web links