OBVD ax

OBVD ax

OBVD ax

Product catalog summary
Composite O-Ring Back Ring Seal Overview
The OBVD ax and OBVD 2ax are composite seals designed to prevent O-ring extrusion into gaps using highly extrusion-resistant back rings. The OBVD 2ax is suitable for dual-sided pressurization, such as static sealing between a piston and rod. The NBR O-ring is firmly attached to a PUR back ring, compensating for design clearances and tube expansion. These seals fit standard groove sizes, like those specified in DIN 3771.

Advantages
  • No gap extrusion due to the combination of an 80° Shore A hardness elastomer O-ring and a 95° Shore A hardness polyurethane back ring.
  • Materials are highly wear-resistant and compensate for radial deformation.
  • Compatible with standard O-ring grooves without modification.
  • No sharp edges that could peel the O-ring.
  • Available in various material combinations for different pressure, temperature ranges, and hydraulic fluids.
  • Easier fitting compared to traditional O-rings, avoiding twisting or rolling.

Materials and Application
The OBVD ax is installed like a conventional O-ring, with the back ring positioned opposite the pressure side. It is crucial not to overstress the back ring during installation. The seal is suitable for standard O-ring grooves and compensates for cylinder expansion. The axial version includes an additional sealing lip.

Technical Specifications
  • Standard materials include 80° Shore A NBR and 95° Shore A PUR, with alternatives available upon request.
  • Pressure range up to 500 bar and temperature range from -30°C to +100°C.
  • Surface quality requirements include a sealing surface Ra ≤ 0.8 µm and groove base Ra ≤ 2.3 µm.

Ordering Information
Standard sizes range from 30 mm to 307 mm in diameter, with various cord sizes available. Further dimensions can be requested. Example order: Diameter 70 mm, OBVD ax 70 x 3, Ref. No.: 034831.
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Catalog excerpts

OBVD ax-1

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Composite O-Ring Back Ring Seal Der OBVD ax bzw. OBVD 2ax verhindert zuverlässig durch hoch extrusionsbeständige Backringe das Einwandern des O-Ringes in den Spalt (Spaltextrusion). The OBVD ax/2ax reliably prevents the O-rings from entering into the gap (gap extrusion) by means of their highly extrusion-resistant back rings. Die Version OBVD 2ax ist für beidseitige Druckbeaufschlagung geeignet, z. B. als statische Dichtung zwischen Kolben und Stange. The OBVD 2ax version is suitable for pressurization on both sides, e. g. as a static seal between piston and rod. Der O-Ring aus NBR, der fest mit dem Backring aus PUR verbunden ist, gleicht konstruktiv bedingte Passungsänderungen aus (Rohratmung). The NBR O-ring, which is firmly fixed to the PUR back ring, compensates for design clearances and tube breathing. Der OBVD ax kann unverändert in vorhandene Standard-Einbauräume, z. B. nach DIN 3771, eingesetzt werden. The OBVD ax is suitable for any standard groove sizes, e.g. in accordance to DIN 3771.

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OBVD ax-2

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal O-Ring Die bisherige Situation The previous situation Keine Spaltextrusion durch die Kombination eines 80° Shore A harten O-Ringes aus einem Elastomerwerkstoff mit sehr guten physikalischen Eigenschaften und eines damit fest verbundenen Backringes aus 95° Shore A harten Polyurethan. Alle Materialien hochverschleißfest. No gap extrusion through a combination of 80° shore A hardness elastomer O-ring with very good physical properties and a permanently attached 95° shore A hardness polyurethane back ring. All materials extremely hard-wearing....

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OBVD ax-3

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Materials O-Ring back ring Application Range pressure temperature [bar] range [°C] Design Hints Surface Finish Surface Quality Dichtfläche / Nutgrund Ra [µm] Sealing Surface / Groove Base Groove Sides Die Montage des OBVD ax entspricht der eines herkömmlichen O-Ringes. Der Backring des OBVD ax liegt auf der druckabgewandten Seite. Den Backring bei der Montage nicht überdehnen. The OBVD ax is fitted like an ordinary O-Ring. The back ring should be opposite to the pressure side. O-Ring mit fest verbundenem Backring innen- oder außendichtend...

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OBVD ax-4

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Bestellbeispiel für Standardausführung / Order Example for standard version: Durchmesser/Diameter d = 70 mm d

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OBVD ax-5

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Schnurstärke cord size s Nutbreite groove width b Einführschräge lead-in chamfer e Nuttiefe groove depth t Tabelle: Einbauraum Bestellbeispiel für Standardausführung: Order Example for standard version: Durchmesser/Diameter d = 140 mm d Hinweis: Zulässige Spaltmaße s. Tabelle S. 24 Hint: Allowable gap sizes see table on page 24 Weitere Abmessungen auf Anfrage lieferbar. 280 Table: installation space Further dimensions on request.

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OBVD ax-6

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Weitere Abmessungen auf Anfrage lieferbar. Further dimensions on request. 281

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OBVD ax-7

O-Ring-Backring-Verbund-Dichtung Composite O-Ring Back Ring Seal Lieferbare Abmessungen entnehmen Sie bitte der Auflistung unserer OBVD ax. Weitere Abmessungen auf Anfrage lieferbar. Available sizes please see OBVD ax. Further dimensions on request. Schnurstärke cord size s Nuttiefe groove depth t Nutbreite groove width b Einführschräge lead-in chamfer e Tabelle: Einbauraum Bestellbeispiel für Standardausführung: Order Example for standard version: Hinweis: Zulässige Spaltmaße s. Tabelle S. 24 Hint: Allowable gap sizes see table on page 24 Durchmesser/Diameter d = 180 mm, Schnurstärke/cord size...

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