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.

QR type thermal oil rotary joints

QR type thermal oil rotary joints

The QR type heat transfer oil rotary joint is an efficient and reliable fluid connection device designed specifically for transmitting heat transfer oil in high-temperature environments. It is widely used in industries such as chemical, plastic processing, textile printing and dyeing, especially in processes that require precise temperature control and continuous operation. This article will provide a detailed introduction to the working principle, sealing structure characteristics, and advantages of QR type thermal oil rotary joints in practical applications

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MT type hydraulic rotary joint

MT type hydraulic rotary joint

MT type hydraulic rotary joint is a fluid transmission device designed specifically for low-speed, high-pressure, multi-channel independent sealing conditions. Its core is used in the bi-directional oil supply and return system of rotating oil cylinders in equipment such as steel coiling machines and machining centers. ‌‌

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HA series air rotary joint

HA series air rotary joint

The HA series air rotary joint is a single channel sealed rotary connection device designed specifically for compressed air/gas media. It adopts a balanced sealing structure and carbon graphite/silicon carbide friction pair, supports dry operation, and is widely used in pneumatic fixtures, rotary cylinders, and automation equipment

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HK type slag cooler rotary joint

HK type slag cooler rotary joint

The HK type slag cooler rotary joint is a key component of the end face sealing and balanced structure designed specifically for the drum slag cooler of circulating fluidized bed boilers. It achieves non-destructive transmission of cooling medium (water/hot oil) between the stationary pipeline and the rotating cylinder in the high-temperature slag cooling system, and supports the replacement of seals during operation

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WF type swivel union

WF type swivel union

WF type rotary joint is a reciprocating swing rotary sealing device, specially designed for non continuous rotation or reciprocating swing working conditions (such as mechanical arms, positioners), and solves the problems of leakage and rapid wear of traditional rotary joints during swing through a special sealing structure. ‌‌

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Y2 type two-way hydraulic swivel union

Y2 type two-way hydraulic swivel union

Y2 type two-way hydraulic rotary joint is a self-supporting dual channel dynamic sealing device, designed to transfer hydraulic oil and other media from fixed pipelines to synchronous rotating components without damage

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Y3 type three-way hydraulic swivel unions

Y3 type three-way hydraulic swivel unions

Y3 type three-way hydraulic rotary joint belongs to the Rotary Union/Swivel Joint, which is specialized for low-speed and high-pressure hydraulic systems, solving the problem of continuous hydraulic oil delivery for rotating equipment such as rotary workbenches, coilers, and engineering machinery turntables

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Y4 type four way hydraulic swivel unions

Y4 type four way hydraulic swivel unions

Y4 type four way hydraulic rotary joint is a multi-channel fluid transmission sealing device dedicated to low-speed and high-pressure hydraulic systems. It has four independent and non interfering flow channels, which can synchronously transmit hydraulic oil, water or gas

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Y5 type five way hydraulic swivel union

Y5 type five way hydraulic swivel union

The Y5 five way hydraulic rotary joint is a mechanical sealing device designed specifically for low-speed and high-pressure working conditions, which enables continuous transmission of five independent hydraulic oil circuits between fixed pipelines and rotating components. Its core features include multi-channel isolation, end face mechanical sealing, and the need for external rotation prevention

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Y6 type six way hydraulic swivel union

Y6 type six way hydraulic swivel union

The Y6 type six way hydraulic rotary joint is a mechanical sealing device designed specifically for low-speed and high-pressure hydraulic systems, achieving leak free transmission of six independent fluid channels between fixed pipelines and rotating components

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JF series swivel union

JF series swivel union

JF type mechanical seal rotary joint is a single path dynamic sealing device that adopts a balanced end face sealing structure and is specifically designed for the transmission of liquid media such as water and ethylene glycol in high-speed rotating equipment

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Expansion and contraction cylinder rotary joint

Expansion and contraction cylinder rotary joint

The high-speed rotary joint of the expansion and contraction oil cylinder is a high-speed and high-pressure hydraulic sealing transmission component specially designed for the expansion and contraction hydraulic cylinder of metallurgical coiling/uncoiling machines

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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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