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Kadant Johnson Europe B.V.
RX Rotary Joint Brochure - EUROPEAN version

RX Rotary Joint Brochure - EUROPEAN version

Product catalog summary

Overview
The RX Rotary Unions are engineered to connect stationary piping to rotating devices, suitable for water, air, and thermal oil services. They incorporate precision micro-lapped seals, anti-friction bearings, and a bearing isolation system to enhance reliability and protection. These unions can intermittently run dry and are available with FDA/EFSA-compliant seals for food and pharmaceutical applications.

Specifications
The RX models range from 3/8” to 6” in size, with varying capabilities in pressure, temperature, and speed. For instance, the RX-3 model can withstand up to 230°C and 3,500 RPM. They comply with the Pressure Equipment Directive (PED 97/23/EC) and are suitable for ATEX-defined explosive atmospheres.

Features and Benefits

Corrosion-resistant stainless steel rotor and springs located outside the flow area.
Two-piece housing for on-machine seal replacement, minimizing downtime and maintenance costs.
Balanced seal assembly and full flow area for extended life and low pressure drop.
Optional bearing isolation system for enhanced bearing protection.

Seal Replacement Procedure
The RX line features a Quick Replacement Design (QRD) for seal replacement while the union remains installed. The procedure involves removing the head, discarding old seals and springs, cleaning surfaces, and installing new components with lubrication.

Recommendations
It is recommended not to operate the unions at maximum pressure, temperature, and speed simultaneously. Consult Kadant Johnson for specific greasing intervals to ensure optimal performance.

Assembly Instructions
The document provides a step-by-step guide for replacing the seal package, highlighting the importance of cleaning seal faces with a lint-free cloth and acetone before reassembly. The head containing the seal ring is secured to the body using socket head cap screws.

Model Variations
Various models are listed with specific part IDs, dimensions, and weights for single and dual flow configurations. Standard ratings for different media and operating conditions are also provided.

Additional Information
For applications involving abrasive fluids or requiring additional connection sizes and reducers, consultation with Kadant Johnson is advised. Syphon pipes are supplied by the customer.

Specifications for Installation
The document details specifications for rotary union installations, focusing on BSP thread connections. The flow rate is determined by the supply pipe size, with larger pipes allowing higher flow rates. The supply pipe length should not exceed four times the rotary union's overall length to prevent stress.

Rotating and Fixed Tube Supply Pipes
Rotating supply pipes can be made from tubing or iron pipe, with proper end machining. For pipes longer than four times the union length, internal support is recommended. Fixed tube supply pipes, made from stainless steel tubing, are silver-soldered into the rotary union elbow, offering higher flow rates and speeds due to lighter weight and thinner walls. Their length should not exceed six times the rotary union's length to avoid stress.

Maximum Speed (RPM)
A table lists maximum speeds for different sizes and thread types, indicating variations in speed capabilities based on design.

Global Support and Manufacturing
Contact information for Kadant's global support offices is provided, covering several countries. Manufacturing locations are in the USA, China, Brazil, and the Netherlands, emphasizing Kadant's commitment to the international market with worldwide product availability and support.

Catalog excerpts

RX Rotary Joint Brochure - EUROPEAN version-1

FLUID HANDLING For water, air, and thermal oil service Engineered reliability for demanding applications. Advanced rotary unions for fluid and air service

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RX Rotary Joint Brochure - EUROPEAN version-2

Quick Select Chart O Recommended Do not operate unions at maximum values O Acceptable of pressure, temperature, and speed. O Not Recommended See page 27 for maximum speed per nipple type.

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RX Rotary Joint Brochure - EUROPEAN version-3

Overview 3⁄ 8” to 11⁄ 2” RX Brass head Plated body Precision ball bearings Metal gasket Stainless steel springs Stainless steel rotor O-ring secondary seal O-ring secondary seal Silicon carbide or carbon graphite seal ring Tungsten carbide counterseat The RX rotary union connects stationary piping to a rotating device. The fluid is sealed by precision, micro-lapped seals that provide a uniform, full-flow design. The union is supported by two widely-spaced anti-friction bearings and is available with a bearing isolation system for added bearing protection. The RX union is capable of intermittent...

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RX Rotary Joint Brochure - EUROPEAN version-4

Single and Dual Flow Standard RX* Ratings Media: *Consult Kadant Johnson for RX-2 and RX-3 unions for applications up to 230°C and for abrasive fluids. Single flow straight thread rotor Dual flow straight thread rotor Media: Water, air, and steam** K M* Model ISO-228-1 ISO-228-1 Rotor RH Part ID – Water/Steam/Air** Single Flow Dual Flow Fixed Pipe Dual Flow Rotary Pipe G Fixed Rotary J1 Pipe Pipe Approx. Weight S Fixed Rotary Pipe Pipe ISO-228-1 OD f7 * For additional connection sizes/reducers, consult Kadant Johnson. ** Steam is not recommended. 4

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RX Rotary Joint Brochure - EUROPEAN version-5

Smooth flow elbow Stainless steel springs Brass head O-ring secondary seal Plated steel body \ Precision ball bearings Metal gasket Stainless steel rotor Silicon carbide or carbon graphite seal ring \ Tungsten carbide counterseat O-ring secondary seal * For additional connection sizes/reducers, consult Kadant Johnson. Dimensions are in mm, are for reference only, and subject to change.

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RX Rotary Joint Brochure - EUROPEAN version-6

Standard RX-11 Ratings Media: Water/Air OilPressure: 13 bar 10 barTemperature: 180°C 180°CSpeed: 3.500 RPM 3.500 RPM *Consult Kadant Johnson for RX-2 and RX-3 unions for applications up to 230°C and for abrasive fluids. Consult Kadant Johnson for the correct greasing intervals. Media: Water, air, and steam2 Model For additional connection sizes/reducers, consult Kadant Johnson. Dimensions are in mm, are for reference only, and subject to change.

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RX Rotary Joint Brochure - EUROPEAN version-7

RX-1 Plated steel body Brass head Precision ball bearings Metal gasket Stainless steel springs Smooth flow elbow Stainless steel rotor O-ring secondary seal O-ring secondary seal Silicon carbide or carbon graphite seal ring Tungsten carbide counterseat Dual flow with Q-flange rotor Single flow with Q-flange rotor Media: Oil K M* Model ISO-228-1 ISO-228-1 Rotor RH 4038 Dual Flow Fixed Pipe H Dual Flow Rotary Pipe Part ID – Oil Single Flow * For additional connection sizes/reducers, consult Kadant Johnson. G Fixed Rotary J1 Pipe Pi

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RX Rotary Joint Brochure - EUROPEAN version-8

Seal Replacement Easy seal replacement The RX line has a unique feature. The complete line from 3⁄8” to 6” is featured with a Quick Replacement Design (QRD). This feature will allow you to repair the RX union while the union is still installed on the machine. The Kadant RX union is the only one offering this feature in a ball bearing line. The RX union is designed for long operating life and short maintenance time to guarantee the best operating times for your production line. How does it work? Step 1. Loosen and remove socket head cap screws (2A) and set aside. Remove head (2). Step 2. Remove...

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RX Rotary Joint Brochure - EUROPEAN version-9

Overview 2” to 3” RX Stainless steel assembly plate Tapped vent holes Precision ball bearings Stainless steel springs Cast iron body Metal gasket Cast iron head Smooth flow elbow Stainless steel rotor Spacer O-ring secondary seal Silicon carbide or carbon graphite seal ring Tungsten carbide counterseat O-ring secondary seal The RX rotary union connects stationary piping to a rotating device. The fluid is sealed by precision, micro-lapped seals that provide a uniform, full-flow design. The union is supported by two widely-spaced anti-friction bearings and is available with a bearing isolation...

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RX Rotary Joint Brochure - EUROPEAN version-10

Single Flow Standard RX1 Ratings Media: Water Oil Pressure: 13 bar 10 bar *Consult Kadant Johnson for abrasive fluids. For oil rotary joints and additional connection sizes/reducers, consult Kadant Johnson. Dimensions are im mm, are for reference only, Thread is according to ISO-228-1. and subject to change.

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RX Rotary Joint Brochure - EUROPEAN version-11

Dual Flow RX Standard RX1 Ratings Media: Water/Air Oil1 *Consult Kadant Johnson for abrasive fluids. For oil rotary joints and additional connection sizes/reducers, Dimensions are in mm, are for reference only, and subject to change. consult Kadant Johnson. Syphon pipe supplied by the customer.

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RX Rotary Joint Brochure - EUROPEAN version-12

Single Flow Standard RX-1* Ratings Media: Water/Air Oil* Pressure: 13 bar 10 bar *Consult Kadant Johnson for abrasive fluids and RX-2 unions for applications up to 205°C. * For oil rotary joints and additional connection sizes/reducers, consult Kadant Johnson. Dimensions are in mm, are for reference only, ** Thread is according to ISO-228-1. and subject to change.

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RX Rotary Joint Brochure - EUROPEAN version-13

Dual Flow RX-1Standard RX-11 Ratings Media: Water/Air Oil1 Pressure: 13 bar 10 bar *Consult Kadant Johnson for abrasive fluids and RX-2 unions for applications up to 205°C. Dimensions are in mm, are for reference only, and subject to change. Syphon pipe supplied by the customer. For oil rotary joints and additional connection sizes/reducers, consult Kadant Johnson.

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RX Rotary Joint Brochure - EUROPEAN version-14

Single Flow Standard RX-31 Ratings Media: Oil Pressure: 10 bar *Consult Kadant Johnson for abrasive fluids. For additional connection sizes/reducers, consult Kadant Johnson. Dimensions are in mm, are for reference only, and subject to change.

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RX Rotary Joint Brochure - EUROPEAN version-15

Dual Flow Standard RX-3* Ratings Media: *Consult Kadant Johnson for abrasive fluids Straight thread rotor K Model ISO-228-1 Rotor Dual Flow Fixed Pipe Dual Flow Rotary Pipe G Fixed Rotary Pipe Pipe S Fixed Rotary V Pipe Pipe ISO-228-1 OD f7 G1”-RH 32,2 64 Approx. Weight K Model Rotor Flange 4200 4250 4300 Dual Flow Rotary Pipe Dual Flow Fixed Pipe Fixed Rotary Pipe Pipe * For additional connection sizes/reducers, consult Kadant Johnson. ** Thread is according to ISO-228-1. Approx. Weight

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