The classification of swivel unions includes: water type, steam type, oil type, pneumatic type, special medium type, and so on

Swivel Union

Swivel Unions is a fluid dynamic sealing connection device, whose core function is to transport media (liquids, gases, steam, etc.) from fixed pipelines to equipment that rotates or swings continuously 360 ° without leakage. ‌‌

Swivel Union
Precision Rotary Joints & Unions for Industrial Fluid Transfer

Choose any application — steam, water, oil, air, or chemical — and we’ll engineer the perfect rotary joint solution for you.

Below are our most trusted rotary joint series, available for standard or custom-engineered orders. As a manufacturer specializing in precision rotary sealing technology, SD SWIVELES Engineering Co., Ltd. brings together a dedicated team of certified mechanical engineers, application specialists, and production experts, each with decades of hands-on experience in the R&D of fluid transfer systems for paper, steel, rubber, plastic, and chemical processing industries.

979-890 swivel unions

979-890 swivel unions

979-890 swivel union, high-speed rotary joint for coolant & MQL applications. Precision mechanical seal, compact structure, stable leak-free performance for machine tool spindle cooling.

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6300-051-161 rotary joint

6300-051-161 rotary joint

6300-051-161 rotary joint (SD 6300 Series). 3" NPT self-supported water rotary union with balanced mechanical seals, cast iron housing for cooling rolls & industrial water transfer.

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Through hole hydraulic rotary joint

Through hole hydraulic rotary joint

Through hole hydraulic rotary joint, center through-hole design, 360 ° continuous rotation, multiple path options, stainless steel material, high-pressure sealing without leakage, can transport hydraulic oil, cooling water, compressed air, suitable for machine tool fixtures, rotary workbenches, and automated turntables, supporting non-standard customization

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Butter and lubricating oil rotary joint

Butter and lubricating oil rotary joint

Grease & lubricating oil rotary union is specially designed for lubricant media. It continuously transfers grease or lubricating oil from stationary pipeline to rotating parts while 360° spinning, to realize centralized lubrication for bearings, gears and other rotary components. Widely used in construction machinery, mining equipment, rotary platforms, winches, cranes and automatic rotary fixtures.

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Rotating joint for solar energy

Rotating joint for solar energy

Solar specific rotary joints are mainly used as collectors in solar thermal oil boilers. Solar thermal oil boilers are boiler systems that use solar energy to heat thermal oil and can stably output it. They are mainly composed of three parts: solar collectors, accumulators, and thermal oil boilers.

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what is Food and pharmaceutical grade rotary joint

what is Food and pharmaceutical grade rotary joint

Food and pharmaceutical grade rotary joints are hygienic, high-purity rotary connection components compliant with food safety and pharmaceutical production standards. Manufactured with food-grade stainless steel and sanitary sealing materials, these sterile rotary joints support 360° smooth rotation, achieving pollution-free, leak-free medium transmission for beverage processing, pharmaceutical fermentation and sanitary industrial production lines.

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Low temperature resistant rotary joint

Low temperature resistant rotary joint

The utility model of low-temperature resistant rotary joint fixedly connects the inner ring and the lower flange, and the upper flange is fixedly connected to the outer ring. In this way, when replacing the nitrogen sealing device, there is no need to disassemble the inner and outer rings. Only the lower flange needs to be loosened to replace the nitrogen sealing device, solving the problem of inconvenient disassembly of the nitrogen sealing device.

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Asphalt rotary joints

Asphalt rotary joints

Modern asphalt distribution trucks generally have four fluid systems, namely hydraulic transmission system, thermal oil heating system, and asphalt distribution system System and compressed air system.

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High pressure car washing machine rotary joint

High pressure car washing machine rotary joint

The high-pressure car washing machine rotary joint is simply a connecting piece that allows the high-pressure water pipe to rotate freely 360 °. Its core function is to prevent the water pipe from getting tangled or knotted, making it more flexible during car washing

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rotary joint for coiling machine

rotary joint for coiling machine

A rotary joint for coiling machine is a precision rotary sealing device that transfers fluids and gases between stationary supply lines and the rotating drum, spool, mandrel, or turntable of a coiling machine

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Centrifuge high-speed rotating joint

Centrifuge high-speed rotating joint

The main function of the centrifuge rotary joint is to input liquid from the pipeline into rotating or reciprocating equipment, and then discharge it from there. The design of this joint allows the equipment to maintain liquid transport even during high-speed rotation, ensuring the normal operation of the equipment

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Why SD-SWIVELES

Precision Rotary Joints · Quality Driven Innovation

From precision machining to seal testing, every step follows international standards (ISO 9001, CE, ATEX) — delivering reliable fluid transfer solutions for paper, steel, chemical, rubber, and plastics industries.

Precision Machining · Micron Tolerances

High-precision CNC machining centers with micron-level tolerances ensure rotational stability and seal integrity, even at high speeds and demanding operating conditions.

High-Performance Materials · Corrosion Resistant

316L stainless steel, alloy steels, silicon carbide, and carbon graphite — selected for maximum corrosion resistance, wear resistance, and compatibility with steam, hot oil, water, and air.

Advanced Sealing · Low Leakage · Long Life

Balanced seal design with silicon carbide/graphite seal rings delivers ultra-low leakage rates under high-temperature and high-pressure conditions, ensuring extended service life and reduced maintenance.

Engineering Experts · Custom Solutions

20+ years of rotary joint engineering experience — offering customized design, sizing guidance, material selection, and on-site technical support for your specific application.

Production Excellence

Production Excellence & Quality Assurance

SDSWIVELES integrates 20 years of engineering experience with German-inspired quality management systems to form a standardized production process for precision rotary joints.

Standardized Production Process

Every rotary joint undergoes a documented manufacturing sequence: precision CNC machining, seal face lapping, assembly, and final inspection. Each unit is traceable with individual quality records and serialized documentation.

Independent Quality Inspection

Our quality department operates with full independence and authority to halt production if standards are not met. Dimensional tolerances are verified to ±0.01mm, and all units are pressure-tested to 1.5x working pressure before shipment.

Batch Consistency & Reliability

Triple validation: "dimensional reports + material certifications + performance test records." Product qualification rates remain stable above 99%, eliminating performance variations and ensuring long-term operational reliability.

Tailored Solutions

Solutions for Every Industry & Application

In the dynamic world of industrial manufacturing, every operation faces unique challenges. At SDSWIVELES, we tailor our engineering expertise to empower your success.

Established Manufacturers

We help you optimize existing equipment with upgraded rotary joint solutions that reduce downtime, improve energy efficiency, and lower maintenance costs. Whether you need to replace aging components, enhance performance while meeting stricter industry standards, or adapt to evolving production demands — we deliver solutions that keep your operations running.

OEM & Machine Builders

Stand out in a competitive market with custom-engineered rotary joint solutions that integrate seamlessly with your equipment designs. We support custom connection configurations, material specifications, compact form factors, and performance validation — helping you deliver reliable machinery to your customers.

Startups & New Ventures

Turn your engineering concept into reliable, production-ready hardware with our end-to-end partnership. From application analysis, material selection, prototyping, manufacturing oversight, to compliance testing — we guide you through every step of your journey from idea to implementation.

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