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Rotary Seal, outside sealing RDA

Rotary Seal, outside sealing RDA

Rotary Seal, outside sealing RDA

Product catalog summary
Overview: The Hunger RDA rotary seal is designed for sealing rotating machine parts, particularly in rotary feed units to separate oil or other fluids under varying pressures. It can handle pressure from both sides and requires minimal installation space, allowing for compact rotary feed unit designs.
Specifications: The RDA seal is suitable for high pressures and low peripheral speeds. It consists of four parts: an elastic element held by L-rings, with a sealing thrust ring on top. The L-rings prevent movement within the seal groove. For pressures above 300 bar and sliding speeds over 0.1 m/s, the temperature should not exceed 70°C (158°F).
Material and Design: The seal is made from standard materials like NBR and PTFE compounds, with alternatives available upon request. The design allows for use in rotary feed units with minimal space and low friction. Surface quality specifications include sliding surfaces with Ra 0.1-0.3 µm and Rt ≤ 1.5 µm.
Installation Procedure: The O-ring is placed in the groove, followed by the sealing thrust ring using a rounded screwdriver or cotton cloth. For diameters under 100 mm, the PTFE thrust ring should be heated to 100°C for easier installation. The split L-rings are then snapped into place. Installation should be done without lubrication, except on the sliding surface.
Order and Dimensions: The document provides a detailed design table for ordering, listing dimensions from 50 mm to 600 mm. Further dimensions are available upon request.
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Catalog excerpts

Rotary Seal, outside sealing RDA-1

RDA Rotor-Dichtsatz, außendichtend Rotary Seal, outside sealing Rotor-Dichtsatz, außendichtend Rotary Seal, outside sealing Der Hunger Rotor-Dichtsatz RDA ist als Dichtelement für drehende Maschinenteile einsetzbar. Er wird vorzugsweise in Drehverteilern zur Trennung von Öl oder anderen Medien bei unterschiedlichen Druckverhältnissen eingesetzt und kann beidseitig druckbeaufschlagt werden. Da die Konstruktion des Dichtsatzes nur kleine Einbauräume erfordert, können die Außenmaße der Drehverteiler gering gehalten werden. Der RDA ist für relativ hohe Drücke bei geringen Umfangsgeschwindigkeiten geeignet. Der Dichtsatz besteht aus 4 Teilen, einem beidseitig durch Kammerringe eingefaßten elastischen Grundkörper, auf dem der dichtende Gleitring aufliegt. Die beidseitigen Kammerringe schützen die gesamte Dichtung vor Einwandern in den Dichtspalt. Bei Betriebsdrücken über 300 bar und einer Gleitgeschwindigkeit über 0,1 m/s darf die vorhandene Betriebstemperatur 70º C nicht überschreiten. Der RDI sollte wegen seiner größeren statischen Haftfläche grundsätzlich dem RDA vorgezogen werden. Je nach Anforderung und Betriebsbedingungen empfiehlt sich eine Behandlung der Gegenlauffläche, wie z. B. Härten auf ca. 56 HRC oder Hartverchromen. The Hunger RDA rotary seal can be used as a sealing element for rotating machine parts. It is mainly used in rotary feed units for separation of oil or other fluids at different pressures and can be subjected to pressure on both sides. Since the seal requires only a small installation space, the external dimensions of rotary feed units can be kept to a minimum. 160 The RDA is suitable for relatively high pressures with low peripheral speeds. The seal consists of 4 parts, an elastic element held by L-rings on which the sealing thrust ring lies. The L-rings on both sides protect the entire seal against movement in the seal groove. With working pressures above 300 bar and a surface sliding speed above 0.1 m/second, the working temperature must not exceed 70°C (158°F). Due to its greater static contact surface, the RDI seal is preferred to the RDA. Depending on the specifications and operating conditions it is recommended to have the running surface hardened to approx. 56 HRC or hard chromium plated.

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Rotary Seal, outside sealing RDA-2

Rotor-Dichtsatz, außendichtend Rotary Seal, outside sealing Werkstoffe Materials elastischer Grundkörper Gleitring Kammerring Standard NBR PTFEBronze <Ø400 POM >Ø400 PA Alternativ (auf Anfrage) FPM, FMVQ, EPD M diverse PTFECompounds elastic ring slide ring L-ring Standard NBR PTFEBronze <Ø400 POM >Ø400 PA Alternative (on request) FPM, FMVQ, EPD M various PTFEcompounds Application Range Einsatzbereich Druck [bar] Standard RDA Temperaturbereich [°C] Gleitgeschw.keit [m/s] Medium 360 -35 ... +100 0,5 StandardHydrauliköle pressure [bar] temperature range [°C] sliding sp e e d [m/s] fluid 360 -35...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.