ROTARY UNIONS

Product catalog summary

Rotary Unions: Characteristics
Rotary unions are mechanical devices that facilitate the transfer of heating or cooling fluids or gases from a stationary pipe to a rotating component, such as a drum or cylinder, in industrial applications. The performance and efficiency of these unions are heavily dependent on the quality of their seals, which connect the stationary and rotating parts. Seal rings must ensure fluid or gas passage without leaks, and factors like rotation speed, pressure, and fluid type can accelerate seal wear. To address this, the unions use durable materials suitable for various fluids or gases, offering longer life cycles and superior performance compared to traditional seals.

Application Examples
Examples include single-flow and double-flow rotary joints, with configurations such as stationary or rotating siphons. These designs cater to different industrial needs, ensuring efficient fluid transfer.

R Series
The R series is commonly used for transferring working pressure in pneumatic clutches and expanding shafts. It is suitable for high-speed applications, rotating on two ball bearings, and available in sizes from 1/8” to 1”.

U Series
The U series is widely used, supported by two ball bearings, and available with graphite or silicon carbide seals for different fluids. It offers one or two-way versions, with fixed or rotating siphons, and sizes from 1/4” to 2” 1/2. Key features include graphite seals for filtered air and water, silicon carbide seals for dirty water or hydraulic oil, stainless steel springs, and nickel-plated versions.

N Series
The N series is supported by two carbon-graphite bearings, suitable for steam, water, and diathermic oils at temperatures up to 316°C. It features impregnated graphite seal rings, visual wear indicators, and easy maintenance. Available sizes range from 1/4” to 2”1/2.

Technical Specifications
Detailed specifications for each series include size, maximum pressure, speed, temperature, and material compatibility. The document provides comprehensive tables outlining these parameters for various models, ensuring users can select the appropriate rotary union for their specific application needs.

Catalog excerpts

Rotary unions Giunti rotanti

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ROTARY UNIONS: characteristics Rotating joints are mechanical devices used to transfer a heating or cooling, fluid or gas from a fixed piping to a rotating part, whether a rotating drum or cylinder, of an industrial application. The performance and efficiency of a rotating joint depend on the quality of the seals, that is the section of the mechanical device that joins the fixed part with the rotating part. The seal rings must be able to guarantee the correct passage of fluid or gas without any leaks. The rotation speed, the pressure and the type of fluid all contribute to wear the seal rings...

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SERIE R ROTARY JOINTS FOR AIR AND VACUUM (high speedness) GIUNTI ROTANTI PER ARIA E VUOTO (alta velocita) The R series is the most widely used solution for transferring the working pressure to pneumatic clutches and expanding shafts. Suitable for use at high speed, they rotate on two ball bearings. Available in sizes ranging from1/8” to 1”. La serie R e la soluzione piu comune per trasferire la pressione di lavoro in frizioni pneumatiche e alberi espansibili. Adatto alle alte velocita, gira su due cuscinetti a sfera. Disponibili da 1/8” a 1” di grandezza. USE IMPIEGO Threaded G UNI 339/66 Filettatura...

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SELF-SUPPORTING BALL BEARING ROTARY JOINTS (double bearings) GIUNTI ROTANTI AUTOSUPPORTATI SFERE (doppio cuscinetto) The U series is the most widely used version, supported by two ball bearings and available with graphite (for filtered air and water) or silicon carbide (for oil and water) seals. Available in one or two way versions and sizes ranging from 1/4” to 2” 1/2, with fixed or rotating siphon. Main features • Graphite seals vs stainless steel is used for air and water filtered at 20 micron at least. • For dirty water or hydraulic oil, silicon carbide seal vs silicon carbide is suggested. •...

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UM SERIES SINGLE-FLOW JOINTS Fixed parts Parti ﬁsse Rotating parts Parti rotanti UF SERIES DUAL-FLOW JOINTS (fixed siphon tube) SERIE UF GIUNTI DUE VIE (tubo sifone fisso) UR SERIES DUAL-FLOW JOINTS (freely rotating siphon tube) UT SERIES DUAL-FLOW JOINTS (rotating with sealing) SERIE UR GIUNTI DUE VIE (tubo sifone rotante libero) SERIE UT GIUNTI DUE VIE (rotazione con tenuta) L (wrench) L (chiave) Flow reversal allowed Inversione ﬂussi ammessa

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SELF-SUPPORTING GRAPHITE ROTATING JOINTS (double bearings) GIUNTI ROTANTI AUTOSUPPORTATI GRAFITE (doppio cuscinetto) The N series is supported by 2 carbon-graphite bearings, for use with steam, water and diathermic oils at temperatures of up to 316 °C. The treated carbon-graphite is suitable for spherical sealing; the seal is perfect and maintenance is quick and easy. Available in sizes ranging from 1/4” to 2”1/2. Main features • Self-support by means of two graphite bearings amply spaced out. • Seal ring is made of impregnated graphite and works in compression (the compression strength of graphite...

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Threaded rotor version Versione con rotore filettato NB SERIES SINGLE-FLOW JOINTS SERIE NB GIUNTI AD UNA VIA Ch (wrench flats) Ch (fresatura per chiave) NF SERIES DUAL-FLOW JOINTS (fixed siphon tube) SERIE NF GIUNTI DUE VIE (tubo sifone fisso) Threaded rotor version Versione con rotore filettato NR SERIES DUAL-FLOW JOINTS (rotating siphon tube) SERIE NR GIUNTI DUE VIE (tubo sifone rotante) Fixed parts Parti fisse Rotating parts Parti rotanti Type tipo

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WWW.RE-SPA.COM Registered office Viale E. Caldara, 40 20122 Milano Italy Headquarters Via Firenze, 3 20060 Bussero (MI) Italy

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ROTARY UNIONS

ROTARY UNIONS

Catalog excerpts

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