STI/STA

STI/STA

STI/STA

Product catalog summary
Support Rings Overview
Support rings are primarily used in static O-ring sealing applications to prevent gap extrusion under pressure. The geometry of the rings, available in profiles L and C, ensures that any gap is bridged by producing a radial load component during O-ring deformation. This design is effective even under extreme pressure conditions due to the increased material strength in stressed areas.

Material and Application
Support rings are suitable for applications with high thermal expansion and elastic deformation of thin-walled cylinder tubes. They are available in materials such as POM, PA, and various PTFE compounds, depending on operational conditions.

Design and Installation
The support rings feature a simple snap installation and are designed as split elements without gaps to facilitate easy installation and prevent O-ring extrusion. Surface quality requirements include a sealing surface roughness of Ra ≤ 0.8 µm and Rt ≤ 3.6 µm, with groove base and side roughness of Ra ≤ 2.3 µm and Rt ≤ 15 µm.

Specifications and Ordering
Standard support rings can be ordered with specific profiles, versions, diameters, and materials. Custom specifications can also be accommodated. An example order for a standard version is STI-CG 100/108.4x1 PTFE.

Technical Parameters
Standard pressure and temperature ranges are up to 360 bar and -30 to +100°C, respectively. The sliding speed is unspecified, but the rings are compatible with hydraulic oil, water-oil, and water-glycol fluids.

Dimensional Details
Tables provide detailed dimensions for O-ring cross-section, support ring width, groove depth, and groove width, with specific values for inside and outside sealing configurations.
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Catalog excerpts

STI/STA-1

Stützring, innen / außen Support Ring, inside /outside Stützring, innen / außen Support Ring, inside / outside Die Hunger Stützringe werden vorzugsweise bei statischer O-Ring-Abdichtung angewendet. Sie verhindern zuverlässig eine Spaltextrusion des O-Ringes bei Druckbeaufschlagung. Hunger support rings are mostly used with static Oring seals. They reliably prevent gap extrusion of Orings under pressure load. Die Geometrie der profilierten Stützringe (Profil L und C) läßt bei Verformung des O-Ringes eine radiale Kraftkomponente wirksam werden, die den vorhandenen Spalt absolut überbrückt. Dies gilt selbst bei extremen Druckbelastungen aufgrund der höheren Materialstärke im beanspruchten Bereich. Due to the geometry of the support rings (profile L and C), deformation of the O-ring produces a radial load component which ensures that any gap is totally bridged. The profile and thickness of the back-up ring ensures that even at extreme pressures the O-ring is prevented from extruding. Dadurch eignen sich die Stützringe vor allem bei Konstruktionen, an denen eine relativ große thermische Ausdehnung auftritt sowie bei elastischer Verformung dünnwandiger Zylinderrohre. Support rings are particularly suitable for applications where relatively high thermal expansion takes place and where elastic deformation of thin-walled cylinder tubes occurs. Je nach Betriebsbedingung stehen die Stützringe in den Werkstoffen POM, PA und diversen PTFE-Compounds zur Verfügung. Depending on the operation conditions, support rings are available in materials POM, PA and various PTFECompounds.

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STI/STA-2

Stützring, innen / außen Support Ring, inside /outside Materials Stützring Support Ring Application Range StandardHydrauliköl, Öl-Wasser, Wasser-Glykol pressure temperature [bar] range [°C] standard hydraulic oil, oil-water, water-glycol Design Hints Surface Finish Surface Quality Dichtfläche / Nutgrund Sealing Surface / Groove Base Groove Sides Einfache Schnappmontage Simple snap installation Spaltfrei geschlitztes Teil für einfache Montage, zur Vermeidung der Spaltextrusion von O-Ringen. Split element without gap, for simple installation, to prevent gap extrusion of O-rings.

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STI/STA-3

Stützring, innen / außen Support Ring, inside /outside außendichtend outside sealing innendichtend inside sealing O-Ring Schnurstärke O-Ring cord size Stützringbreite support ring width Nuttiefe groove depth Radius radius Nutbreite groove width Einführschräge lead-in chamfer (15°) Ausführung version geschlitzt splitted α = 30° ungeschlitzt unsplitted (1 Stützring) (1 support ring) (2 Stützringe) (2 support rings) Stützringe nach Kundenangabe können ebenfalls kurzfristig gefertigt werden. Bestellbeispiel für Standardausführung: Order Example for standard version: Support rings can also be manufactured...

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