Air rotary union QT40

for hot oilfor steamfor hot water

Product Overview
The QT40 rotary union is a Q-type universal rotary joint with a carbon steel body, manufactured to the QD40 dimensional envelope for direct replacement in industrial equipment. Inner diameter 40 mm and total height 118 mm. Designed to transfer steam, hot oil and hot water between stationary supply lines and rotating machine components at low to moderate speed. OEM/ODM support available.

Short Description

• QT40 universal rotary union
• Carbon steel body | ID 40 mm × H 118 mm
• 20° rotor free swing to accommodate misalignment
• Short operational listing: ≤10 RPM | ≤1.0 MPa | ≤200°C (page summary)
• Media: Steam · Hot oil · Hot water · Air

Technical Specifications

• Model: QT40
• Body material: Carbon steel
• Inner diameter: 40 mm (R1-1/2 / Rc1-1/2 thread)
• Total height: 118 mm
• Maximum pressure: 1.8 MPa
• Maximum temperature: 220°C
• Maximum rotational speed: 200 RPM
• Seal type: Spherical graphite auto-compensating seal
• Bearing: Dual oil-free bearing support

Key Features

• Leak-free operation: Spherical seal ring self-compensates for wear to maintain sealing performance
• Low torque rotation: Precision machining and bearings minimize friction on the drive system
• Self-centering: Spherical seal tolerates minor misalignment, suitable for retrofit applications
• Easy maintenance: Modular seal design allows quick replacement without full disassembly

Typical Applications

• Textiles & Printing: Heat-transfer oil circulation for drying cylinders and calender rolls
• Plastics & Rubber: Hot oil or steam supply to rotating molds and extruders
• Paper & Pulp: Steam heating for drying cylinders within rated temperatures
• Chemical & Pharmaceutical: Heat-medium transfer in reactors and mixing vessels