Zero Cross Leakage PTFE Sealed 4-Channel Pneumatic Rotary Union LHK078-4Q, 200RPM 2MPa Gas Rotary Joint for Winding & Unwinding Machinery

Ingiant Technology specializes in manufacturing high-performance, long-service-life pneumatic rotary unions designed exclusively for industrial winding and unwinding production equipment. Our flagship LHK078-4Q 4-channel rotary joint integrates advanced sealing structure, premium metal raw materials and standardized technical parameters, delivering stable air transmission performance for continuous heavy-duty roll-to-roll manufacturing lines, solving the common problems of gas cross leakage, fast wear and pressure fluctuation on traditional rotary connectors.

1. Core Sealing Performance Advantages

The biggest highlight of the LHK078-4Q rotary union is its spring energy storage composite PTFE sealing system, which brings two core competitive advantages: zero gas cross leakage and ultra-low rotational friction. Different from ordinary single-ring sealing rotary joints on the market, our built-in elastic spring structure continuously pushes the PTFE sealing rings to maintain tight contact between the static housing and rotating rotor during long-term operation. Four completely separated independent air passages are fully isolated by multi-layer composite sealing components, so air pressure signals transmitted in each channel will not mix or leak mutually, completely avoiding production failure caused by disordered tension control of winding equipment.

Polytetrafluoroethylene (PTFE) material owns an extremely low friction coefficient, which greatly reduces rotation resistance when the rotor rotates continuously. The friction loss between moving parts is far lower than rubber and polyurethane seals, which effectively lowers the load of the driving motor of winding machines and saves long-term power consumption. Meanwhile, the PTFE seal features excellent temperature resistance, and it will not soften, deform or lose sealing elasticity under the maximum working temperature of 100°C, ensuring consistent sealing effect even after 24-hour non-stop heavy-duty production. All sealing assemblies are pre-assembled and tested in dust-free workshops, each finished unit passes air tightness inspection before leaving the factory to guarantee zero leakage rate of delivered products.

2. Premium Material & Precision Manufacturing Craft

Every structural component of LHK078-4Q is made of industry-standard high-strength anti-wear metal materials, with strict surface treatment process to extend service life and improve environmental adaptability.

• Rotor (Shaft): Adopts 12L14 free-cutting steel, heat treated to reach hardness of 56-62 Rc, then processed with black oxide anti-rust coating. The high-hardness steel rotor can withstand long-term cyclic rotational friction without shaft surface abrasion and clearance expansion, avoiding air leakage caused by increased fit gap after thousands of working hours. The black oxide layer blocks air and moisture, preventing rust even in humid industrial workshop environments.
• Housing: Made of 6061-T6 aviation-grade aluminum alloy, finished with Type 2 Class 2 red hard anodizing treatment. The thick anodic oxidation layer enhances surface scratch resistance, oxidation resistance and corrosion resistance, effectively resisting chemical vapor and dust erosion in textile, lithium battery and plastic film production workshops. Aluminum alloy material keeps the whole rotary union compact and lightweight, will not add extra load to the winding roller shaft.

All internal flow channels are processed by CNC precision lathes, with smooth inner wall without burrs, which reduces gas flow resistance and avoids unnecessary pressure loss during air transmission. All parts go through deburring, ultrasonic cleaning and dimensional tolerance detection before assembly, ensuring matching accuracy of every component and stable rotation without jitter or abnormal noise.

3. Complete Standard Technical Parameters

Model Number: LHK078-4Q Number of Air Channels: 4 independent separated air passages Standard Port Thread: 1/4″ NPT Applicable Working Medium: Clean compressed gas, non-corrosive industrial air Maximum Applicable Rotation Speed: ≤200 RPM Maximum Allowable Working Pressure: ≤2 MPa Permissible Operating Temperature Range: Normal ambient temperature to 100°C Surface Treatment: Red Type 2 Class 2 anodized aluminum housing, black oxide hardened steel rotor Mounting Form: Standard flange fixed installation

These parameter indicators are fully matched with medium and low-speed winding production lines, covering most mainstream pneumatic tension control systems for roll material processing equipment. Whether it is low-speed thick paper winding or medium-speed thin film slitting and unwinding, the rotary union can maintain stable air pressure output without pressure drop or gas leakage during start-stop and forward-reverse rotation switching.

4. Stable Running Performance for Heavy-Duty Continuous Production

Optimized internal bearing matching structure makes the rotor rotate smoothly with tiny friction torque, no jamming, stuck rotation or sharp abnormal noise even under long-time vibration environment of slitting machines. The compact integrated overall structure avoids loose parts caused by long-term mechanical vibration, and the internal sealing structure will not fail instantly under frequent alternating rotation of winding and unwinding rollers.

The product is designed for non-stop heavy-duty production mode, supporting 24-hour uninterrupted cyclic operation without mandatory shutdown rest. Compared with ordinary rotary joints that need regular seal replacement within one month, our PTFE composite sealing structure can keep stable performance for several months under continuous operation, greatly reducing maintenance frequency and labor cost of equipment.

5. Wide Application Scope for Winding & Unwinding Machinery

This 4-channel pneumatic rotary union is specially developed for roll-to-roll winding and unwinding industrial equipment, covering multiple mainstream manufacturing industries:

1. Film Processing Industry: Optical film, protective film, plastic packaging film winding and slitting machines. Four independent air channels separately control film tension, edge correction, roller clamping and auxiliary pressing air cylinders to realize stable film winding without wrinkling and deviation.
2. Textile Industry: Yarn winding machines, fabric unwinding rollers, textile slitting and coiling equipment, used to adjust fabric coiling tightness and maintain uniform tension during textile production.
3. New Energy Lithium Battery Industry: Electrode winding machines for lithium ion batteries, independently supply air pressure for pole piece clamping, winding tension adjustment and roller pressing, to ensure neat winding of battery pole pieces.
4. Packaging & Tape Industry: Adhesive tape winding machines, paper roll slitting and rewinding equipment, suitable for all kinds of flexible roll material coiling and uncoiling production lines.

No matter single-station small winding machine or multi-station automatic continuous winding production line, LHK078-4Q can be installed on the end of rotary winding roller to realize multi-channel air pressure transmission between fixed air pipelines and rotating roller components.

6. Convenient Installation & Flexible Customization Service

Standard flange mounting design simplifies on-site installation work. Operators only need to align the flange hole positions with the winding roller end and fix it with common standard bolts, no complicated equipment modification is required, which greatly shortens the equipment replacement time. The compact overall dimension occupies tiny installation space, and it can be adapted to narrow internal assembly space of various winding equipment models.

We provide full-range personalized customization services according to customers’ special production demands: adjustable port thread specifications (NPT, G, PT thread optional), customized mounting flange size and hole spacing, special high-temperature or chemical-resistant sealing materials, and modified channel layout as required. All customized products will complete air tightness test and rotation aging test before delivery to verify stable performance under customers’ actual working parameters.

Standardized replaceable sealing components are designed for after-sales maintenance. When the sealing ring reaches service life, users can quickly disassemble and replace the spare seal parts without replacing the whole rotary union, effectively reducing equipment downtime and improving overall production efficiency of winding workshops.

7. After-sales & Technical Support

All LHK078-4Q pneumatic rotary unions are fully inspected before delivery, complete product parameter labels and installation instructions are attached to each package. Our professional technical team can provide parameter matching guidance according to customers’ winding machine speed, air pressure and temperature working conditions. If you have special technical requirements or customized scheme demands, please send your detailed equipment technical specifications to us, we will provide accurate quotation and exclusive customized rotary union solution as soon as possible.