Maier Rotary Union

Welcome to your definitive resource for Maier Rotary Union. As a global leader in fluid transfer solutions, Christian Maier GmbH & Co. KG has set the industry standard for quality and reliability with its German-engineered rotary unions (also known as rotary joints). This page serves as a comprehensive guide to the Maier product portfolio, its applications, and common technical questions.

Furthermore, as a professional exporter of industrial components, we understand the critical balance between performance and cost. That’s why, in addition to providing detailed information on Maier products, we also introduce our line of high-performance, cost-effective replacement rotary unions. Our products are designed to be direct, drop-in replacements for Maier, Deublin, and other major international brands, offering you equivalent or superior performance without the premium price tag.

What is a Maier Rotary Union?

A Maier Rotary Union is a precision mechanical device designed to transfer fluid (like water, steam, thermal oil, hydraulic oil, coolant, or air) from a stationary source, such as a pipe, into a rotating piece of machinery, like a drum, roll, or spindle. Its core function is to maintain a perfect seal under pressure and rotation to prevent leaks, ensuring operational efficiency and safety.

Key Advantages of Maier Rotary Union

• Exceptional Durability: Built with high-quality materials like silicon carbide and specialty carbon graphite seals for extended service life.
• Proven Sealing Technology: Advanced sealing mechanisms, including balanced mechanical seals, minimize friction and prevent leakage even in high-pressure and high-speed applications.
• Broad Application Range: An extensive product catalog covering a vast range of sizes, temperatures, pressures, and media types.
• German Engineering: Synonymous with precision, reliability, and robust performance in demanding industrial environments.

In-Depth Look: Maier Rotary Union Product Series

Maier categorizes its rotary unions into distinct series, each engineered for specific operational conditions. Understanding these series is key to selecting the right component.

H/HW Series: The Robust All-Rounder

• Media: Water, Steam, Thermal Oil (HW), Hydraulic Oil.
• Key Features: A workhorse series known for its durability and reliable belly-seal design. Many models feature duo-flow or quad-flow capabilities and are suitable for a wide array of general industrial applications.
• Common Industries: Paper, Textiles, Plastics, Rubber, Printing.

H115R, H120R, H125R, H132R, H140R, H150R, H165R, H180R, H1100R
H115L, H120L, H125L, H132L, H140L, H150L, H165L, H180L, H1100L
H115K, H120K, H125K, H132K, H140K, H150K, H165K, H180K, H1100K
H215R, H220R, H225R, H232R, H240R, H250R, H265R, H280R, H2100R
H215L, H220L, H225L, H232L, H240L, H250L, H265L, H280L, H2100L
H215K, H220K, H225K, H232K, H240K, H250K, H265K, H280K, H2100K
H325R, H332R, H340R, H325L, H332L, H340L, H325K, H332K, H340K
HR215R, HR220R, HR225R, HR232R, HR240R, HR250R, HR265R, HR280R, HR2100R
HR215L, HR220L, HR225L, HR232L, HR240L, HR250L, HR265L, HR280L, HR2100L
HR215K, HR220K, HR225K, HR232K, HR240K, HR250K, HR265K, HR280K, HR2100K

HW115R, HW120R, HW125R, HW132R, HW140R, HW150R, HW165R, HW180R, HW1100R
HW115L, HW120L, HW125L, HW132L, HW140L, HW150L, HW165L, HW180L, HW1100L
HW115K, HW120K, HW125K, HW132K, HW140K, HW150K, HW165K, HW180K, HW1100K
HW215R, HW220R, HW225R, HW232R, HW240R, HW250R, HW265R, HW280R, HW2100R
HW215L, HW220L, HW225L, HW232L, HW240L, HW250L, HW265L, HW280L, HW2100L
HW215K, HW220K, HW225K, HW232K, HW240K, HW250K, HW265K, HW280K, HW2100K
HW325R, HW332R, HW340R, HW325L, HW332L, HW340L, HW325K, HW332K, HW340K
HWR215R, HWR220R, HWR225R, HWR232R, HWR240R, HWR250R, HWR265R, HWR280R, HWR2100R
HWR215L, HWR220L, HWR225L, HWR232L, HWR240L, HWR250L, HWR265L, HWR280L, HWR2100L
HWR215K, HWR220K, HWR225K, HWR232K, HWR240K, HWR250K, HWR265K, HWR280K, HWR2100K
HW115K-400, HW120K-400, HW125K-400, HW132K-400, HW140K-400, HW150K-400, HW165K-400, HW180K-400, HW1100K-400
HW220K-400, HW225K-400, HW232K-400, HW240K-400, HW250K-400, HW265K-400, HW280K-400, HW2100K-400
HWR220K-400, HWR225K-400, HWR232K-400, HWR240K-400, HWR250K-400, HWR265K-400,HWR280K-400, HWR2100K-400

DP Series: The High-Speed Specialist

• Media: Water, Thermal Oil, Compressed Air, Coolant.
• Key Features: Designed for high-speed applications with a balanced mechanical seal. This series minimizes friction and torque, making it ideal for machinery where operational speeds are critical.
• Common Industries: Printing, Plastics Converting, Machine Tools.

P210G, P215G, P220G, P225G, P232G, P240G, P250G PR210G, PR215G, PR220G, PR225G, PR232G, PR240G,
PR250G, PO210G, PO215G, PO220G, PO225G, PO232G, PO240G, PO250GP210N, P215N, P220N, P225N, P232N,
P240N, P250N PR210N, PR215N, PR220N, PR225N, PR232N, PR240N, PR250N PO210N, PO215N, PO220N,
PO225N, PO232N, PO240N, PO250N ES10, ES15, ES20, ES25, ES32, ES40, ES50 DP10R51, DP15R DP20L51,
DP25L51, DP32L51, DP40L51, DP50L51 DP10R11, DP15R11, DP20R11, DP25R11, DP32R11, DP40R11,
DP50R11, DP10L11, DP15L11, DP20L11, DP25L11, DP32L11, DP40L11, DP50L1151, DP20R51, DP25R51, DP32R51, DP40R51, DP50R51 , DP10L51, DP15L51,

DX/DXS Series: The Maintenance-Free Solution

• Media: Water, Coolant.
• Key Features: Billed as a “maintenance-free” solution, the DX series incorporates advanced bearing and sealing technology to offer a long, unattended service life. The DXS variant includes a ceramic-coated seal face for even greater durability.
• Common Industries: Machine Tools (for through-spindle coolant), General Machinery.

DX110R, DX115R, DX120R, DX125R, DX132R, DX140R, DX150R, DX165R, DX180R, DX110L, DX115L, DX120L, DX125L, DX132L, DX140L, DX150L, DX165L, DX180L
DX110K, DX115K, DX120K, DX125K, DX132K, DX140K, DX150K, DX165K, DX180K
DX210R, DX215R, DX220R, DX225R, DX232R, DX240R, DX250R, DX265R, DX280R
DX210L, DX215L, DX220L, DX225L, DX232L, DX240L, DX250L, DX265L, DX280L
DX210K, DX215K, DX220K, DX225K, DX232K, DX240K, DX250K, DX265K, DX280K
DXR215R, DXR220R, DXR225R, DXR232R, DXR240R, DXR250R, DXR265R, DXR280R,DXR215L, DXR220L,
DXR225L, DXR232L, DXR240L, DXR250L, DXR265L, DXR280L, -DXR215K, DXR220K, DXR225K, DXR232K,
DXR240K, DXR250K, DXR265K, DXR280K,

DQ Series: The High-Temperature Expert

• Media: High-Temperature Thermal Oil.
• Key Features: Specifically engineered for extreme temperature and high-speed applications like those found in calender stacks. Often features a cooling circuit to protect bearings and seals from intense heat.
• Common Industries: Plastics, Non-woven Textiles, Rubber.

DQLB225K, DQLB232K, DQLB240K, DQLB250K-100, DQLB265K-100, DQLB280K-100, DQLB2100K-100,
DQLB2125K-100, DQLB2150K , DQB225K, DQB232K, DQB240K, DQB250K-100, DQB265K-100, DQB280K-100,
DQB2100K-100, DQB2125K-100, DQB2150K, DQTB225K, DQTB232K, DQTB240K, DQTB250K-100, DQTB265K-100, DQTB280K-100,DQTB2100K-100, DQTB2125K-100, DQTB2150K

DA Series

DA1100K-160, DA1125K-160, DA1150K-160, DA1200K-160, DA1250K-160, DA1300K-160, DA2125K-160
DA2150K-160, DAA2125K-160, DAA2150K-160, DAA2200K-160, DAA2250K-160, DAA2300K-160, – DA150K-400,
DA165K-400, DA180K-400, DA1100K-400, DA1125K-400, DA1150K-400, DA1200K-400 DA1250K-400, DA1300K-400, DA250K-400, DA265K-400, DA280K-400, DA2100K-400, DA2125K-400 DA2150K-400, DAA250K-400,
DAA265K-400, DAA280K-400, DAA2100K-400, DAA2125K-400, DAA2150K-400 DAA2200K-400, DAA2250K-400, DAA2300K-400

M Series

M115R, M120R, M125R, M132R, M140R, M150R, M165R, M180R, M1100R
M115L, M120L, M125L, M132L, M140L, M150L, M165L, M180L, M1100L
M115K, M120K, M125K, M132K, M140K, M150K, M165K, M180K, M1100K
M215R, M220R, M225R, M232R, M240R, M250R, M265R, M280R, M2100R
M215L, M220L, M225L, M232L, M240L, M250L, M265L, M280L, M2100L
M215K, M220K, M225K, M232K, M240K, M250K, M265K, M280K, M2100K
M320R, M325R, M332R, M340R, M320L, M325L, M332L, M340L, M320K
M325K, M332K, M340K, MR215R, MR220R, MR225R, MR232R, MR240R, MR250R, MR265R, MR280R, MR2100R
MR215L, MR220L, MR225L, MR232L, MR240L, MR250L, MR265L, MR280L, MR2100L
MR215K, MR220K, MR225K, MR232K, MR240K, MR250K, MR265K, MR280K, MR2100K

Common Applications Across Industries

Maier rotary union is an integral component in countless manufacturing processes:

• Paper & Corrugating: Transferring steam and evacuating condensate from drying cylinders.
• Printing & Converting: Cooling or heating rollers to maintain precise temperature control for ink and laminates.
• Machine Tools: Delivering high-pressure through-spindle coolant (TSC) to the cutting tool.
• Plastics & Rubber: Heating and cooling calendar rolls, extruders, and mixers.
• Textiles: Supplying steam or hot water to drying cans and sizing machines.
• Renewable Energy: Used in the hydraulic pitch control systems of wind turbines.

The Smart Alternative: High-Performance, Cost-Effective Replacements

While Maier sets a high bar for quality, their products come with a premium price and potentially long lead times. We offer a compelling alternative.

Our replacement rotary unions are engineered to serve as direct, drop-in replacements for Maier and Deublin models. We provide a solution that allows you to significantly reduce your maintenance and component costs without sacrificing performance or reliability.

Why Choose Our Alternative Solutions?

• Significant Cost Savings: Get the performance you need at a fraction of the cost of OEM parts, directly improving your bottom line.
• Uncompromising Quality: We use the same high-grade materials, including precision bearings and premium seal faces (Carbon Graphite, Silicon Carbide), ensuring robust performance and long service life. Every unit is pressure tested before shipment.
• Fast Delivery & Ample Stock: We maintain a large inventory of common models, ready for immediate dispatch. Reduce your machine downtime by getting the parts you need faster.
• Expert Technical Support: Our team of specialists is here to help you cross-reference part numbers, select the right product, and provide installation support, ensuring a seamless transition.

Ready to upgrade your performance and lower your costs? Contact us today for a no-obligation quote on our replacement rotary unions for your Maier applications!