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Custom Rotary Unions - General Information
    
DSTI offers complete custom rotary union design and build services. An experienced engineering staff is available to discuss your application in detail to make suggestions as to the best design for your specific needs. After learning about your application, they will design a custom rotating union that will fit into your space envelope, transfer your medias, handle your system pressures and operate at your rotational speeds.

  
Test of the products :

All products DSTI are systematically tested at 100% prior to delivery.

Ultra Pure and Food Grade Unions :

DSTI currently supplies a number of custom unions for specialized applications in the Semiconductor, food packaging and pharmaceutical industries. Custom rotary union designs can be used to transfer food grade products, pharmaceutical medias, ultra pure gasses, acids, slurries and more.

Large Custom Assemblies :

DSTI specializes in large, custom rotary union assemblies. Custom rotary unions are available with 30''+ through bores, high flow volumes, 20+ passages, and more
Exemples of Industries Served :
Semiconductor, Custom Assembly Equipment, Construction and Off Road Equipment, Plastic Molding, Food and Beverage Processing, Paper Processing, Packaging Equipment, Robotics, Raw Material Processing.
Product Options :
Materials :

Carbon Steel, Stainless Steel, Brass, Alloys, Tool Steels, Hastalloy, Titanium, PEEK®, Teflon®, and other specialty materials.

Platings and Coatings :

Black Oxide, Anodized, Standard, Modified and Teflon® impregnated E-Nickel, QPQ, Ceramic coated and others.

Seal Types :

Standard and specialized O-ring seals, Mechanical face seals, DynaSeal™ seal bands, FDA approved seals for foodservice, Energized Lip seals, Controlled Leakage designs.

Integrated Electrical Slip Ring :

Slip rings can be added to rotary unions to allow for electrical power, data and signal transfer. Multiple circuits and power capacities are available.

Design Integration :

Our custom unions can be designed to also function as a drive shaft, bearing block, distribution manifold, mounting surface, and more…

Custom Rotary Unions - General Information

Capabilities :

DSTI designs, manufactures, assembles and tests all products in house.

Design of seals :

DSTI designs and manufactures its own special seals. The custom Rotary Unions can thus integrate seals Téflon®, mechanical seals, lip seals, O-rings and different.

Response time :

DSTI typically responds to all inquiries within 24 hours. Proposals include a print or CAD file for better customer understanding of the proposed design.

CAD Drawing :

DSTI can provide 2-D and 3-D CAD drawing downloads to all customers for custom designs.

Electric Rotary Unions :

DSTI offers also a large variety of electric rotary unions in options, including completely integrated models.

Examples of Custom Products
Custom 1

This 6-port custom stainless steel rotary union / electrical slip ring assembly was designed for a 65 rpm, 1500 psi application. This custom assembly includes dual side mounted manifolds used to route coolant through the union housing. This design also includes a 12-circuit electrical slip ring for signal and data transfer.
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 Custom 1
Custom 2

This large, custom rotary union assembly was designed for gas, vacuum, abrasive media and fluid transfer. This assembly was designed as (2) separate unions which bolt together to meet customer size and flow requirements. Total assembly is 24'' long, 12'' diameter, weighs over 450 lbs and rotates at 10 rpm.
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 Custom 2
Custom 3

This 3-passage custom stainless steel union assembly was designed for 6000 psi nitrogen gas transfer. The package included a bolt on manifold to transfer the nitrogen to the customer's equipment. Designed for the aerospace industry, DSTI was designated as the single source supplier for this critical component.
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 Custom 3
Custom 4

This custom 1-passage shaft-mounted rotary union assembly was designed to transfer air directly into the customers existing 6'' O.D. shaft. Features of this design include steel and aluminum construction and dual bearing covers due to the harsh operating environment.
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 Custom 4
Custom 5

This miniature custom union assembly was designed for a robotic application in the semiconductor industry. All aluminum design has (4) passages for air and vacuum, plus a (5) circuit electrical slip ring for signal and data transfer. The entire assembly is 4'' long and weighs less than one pound.
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 Custom 5
Custom 6

This Custom 9-passage union assembly was designed for hydraulic fluid, air and coolant transfer. Assembly included an integrated (4) circuit electrical slip ring for signal and data transfer. The shaft of this rotary union was designed to be a load bearing portion of the customer's equipment and supports in excess of 700 lbs.
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 Custom 6
Custom 7

This unique custom 2-passage assembly was designed for water transfer. The shaft of this custom union assembly was designed to fit directly into customer's drive system and required our production department to hold tolerances within .0001''. A gear is mounted to the union shaft, which is used to rotate the entire assembly.
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 Custom 7
Custom 8

This large 2-passage union is used in a water treatment facility, and operates at 15 rpm while completely submerged in dirty water. This design incorporates an internal bearing system that is supplied with grease using automated lubrication system.
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 Custom 8
Custom 9

This custom stainless steel 3-passage assembly was designed for a customer in the semiconductor industry. This compact design uses both mechanical face seals and DynaSeal™ Teflon seals, and was designed for intermittent 650 rpm duty.
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 Custom 9
Custom 10

This custom stainless steel 2-passage assembly was designed for a robotic application in a medical manufacturing environment. The shaft end of this assembly was designed to directly mount a specific gripper type. The gripper bolts onto the flange end of the shaft and the opposite end has an extension which is used to drive the assembly.
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 Custom 10
Custom 11

This 4-port stainless steel custom rotary union was designed for clean room service. This assembly operates at 65 rpm and is used to transfer vacuum. This design included serveral tapped supply ports between each vacuum channel to supply a pad gas to the area between the seals. An 18-circuit inegrated electrical slip ring for signal and data transfer was also required for this application.
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 Custom 11
Custom 12

This large, complex custom rotating union assembly was designed to transfer multiple passages of coolant into customer's equipment. The union fits precisely into equipment design, and is used as a significant load bearing portion of the assembly. This custom rotary union has a diameter of 13.5'' and weighs over 350 lbs. (Pictured with LT Series P/N 2121)
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 Custom 12
Custom 13

These small, light weight custom unions are used for a 100 psi air, indexing table application. These simple, inexpensive units were designed to fit the customers existing equipment. Low torque seals and all aluminum construction are two of the features incorporated into this design.
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 Custom 13
Custom 14

These 2-passage stainless steel and brass custom rotary unions were designed for the car wash industry. Simple yet robust design has proven effective for this 10 rpm, 1100 psi water and chemical transfer application.
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 Custom 14
Custom 15

This Custom 12-passage rotary union assembly was designed for water, hydraulic fluid and air transfer. The air and water pass through the blue aluminum housing at 100 psi, while the hydraulic is transferred through the black steel housing at 5000 psi. Integrated 24-circuit electrical slip ring was included for signal and data transfer.
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 Custom 15
Custom 16

This 4-passage custom rotary union was designed as a direct replacement for an existing product. The customer required higher hydraulic pressures than the original unit was capable of. This custom union assembly was designed to fit into the same space envelope, yet offers a max. pressure rating of 7500 psi versus 3600 psi.
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 Custom 16
 
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