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.

3-in-3 pneumatic swivel union

3-in-3 pneumatic swivel union

3-In-3-Out Pneumatic Rotary Joint is a precision mechanical sealing device specifically designed to solve the problem of multi-path gas transmission between rotating components and fixed gas sources

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2-in-1 pneumatic rotary joints

2-in-1 pneumatic rotary joints

2-in-1/2-in-1 pneumatic rotary joint (also known as slip ring or rotary joint) is a precision sealing device used to transfer compressed air or other gas media from a stationary pipeline to a 360 degree continuous rotating component

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Flange type swivel union

Flange type swivel union

A flange type rotatable joint is a critical fluid dynamic sealing device used to transport fluid media (such as gas, liquid, oil, steam, etc.) from fixed pipelines to rotating or swinging equipment

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DN large-diameter rotary joints

DN large-diameter rotary joints

DN large-diameter rotary joints are heavy-duty industrial rotary connectors designed for high-flow fluid transmission systems. Featuring oversized flow passages, excellent pressure-bearing capacity, stable low-torque rotation and enhanced integral sealing structure, these professional rotary joints support high-volume, uninterrupted delivery of water, oil and gas media, meeting large-flow operational demands of heavy industrial rotating equipment.

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QS-Y type rotary joints

QS-Y type rotary joints

QS-Y type rotary joint is a specialized fluid conveying component designed for the printing and dyeing industry and papermaking enterprises, mainly used for steam and hot water medium transmission in standard drying cylinders and other equipment

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SN steam rotary joints

SN steam rotary joints

SN steam rotary joints are professional high-temperature resistant rotary connection components specially designed for steam heat transmission systems. Featuring high temperature resistance, pressure durability, low friction rotation and reliable high-temperature sealing performance, these standard SN series rotary joints achieve stable, leak-free steam medium transmission, supporting continuous and efficient operation of various steam heating and industrial thermal equipment.

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Hydraulic high-pressure rotary joints for wind turbine

Hydraulic high-pressure rotary joints for wind turbine

The rotary joint of a wind turbine, commonly referred to as a hydraulic slip ring or fluid transmission joint in the wind energy industry, is a key precision component in wind power generation systems that enables continuous transmission of fluid media (such as hydraulic oil, coolant) and electrical signals between the stationary and rotating parts

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Rotary joints for machine tool renovation and improvement

Rotary joints for machine tool renovation and improvement

In the process of machine tool transformation and performance upgrade, the rotary union, as a key sealing device connecting the fixed fluid source and rotating components, directly determines the cooling efficiency, machining accuracy, and equipment life through its selection and application

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Three liquid one gas rotary joints

Three liquid one gas rotary joints

The "three liquid one gas" rotary joint belongs to a specific configuration form of multi-path fluid rotary connectors, usually referring to the integration of three independent liquid channels and one independent gas channel inside a compact joint housing

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Gap labyrinth rotary joints

Gap labyrinth rotary joints

Gap labyrinth rotary joint is a fluid transmission device that adopts non-contact sealing principle. It forms flow resistance through carefully designed multi-stage tortuous micro gaps between the rotating and stationary parts

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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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