Rotary Joint Repair Seals

Common causes of seal failure

Abrasions and scratches

Long-term high-speed operation or the insention of media impurities can lead to grooves, brushing, or cracks on the sealing surface (e.g., graphite rings, O-rings), which will destroy the sealability.

High temperature and pressure influence

High operating temperatures or pressure fluctuations can harden and deform rubber seals, accelerating aging.

Improper installation

Failure to align concentricity during installation, knocking on the seal, or not replacing the gasket with a new one can cause early damage.

5 key steps in seal repair

Disassembly and cleaning

Safe operation: Cut off the power supply of the equipment, disassemble the Rotary joint, and fix it on the vice to avoid violent disassembly and damage to the parts.

Cleaning process: Use kerosene or alcohol to thoroughly clean all parts, focus on cleaning the remaining carbon or impurities on the sealing surface, and blow dry with compressed air.

Seal inspection and evaluation

Graphite sealing ring: check whether the friction surface is eccentric and broken, and minor scratches can be repaired by manual grinding of oil sand; Severe damage requires direct replacement.

Rubber O-rings: Observe for deformation, hardening, or cracks, and it is recommended to replace them regularly (usually 3-5 years) to ensure elasticity.

Springs and bearings: Weakened spring elasticity or bearing wear need to be replaced simultaneously to avoid insufficient sealing pressure.

Grinding and polishing of the sealing surface

Hand grinding: Select abrasive sand (such as silicon carbide) with appropriate particle size and polish with carrier oil (spindle oil and kerosene mixture) to repair the flatness and finish of the sealing surface.

Precautions: Control the grinding pressure to avoid the deformation of the sealing surface caused by excessive cutting. When completed, the residual abrasive should be cleaned with alcohol89.

Seal replacement and assembly

Selection of highly compatible materials: Rubber or fluoroelastomer seals are selected according to the characteristics of the medium (oil resistance, high temperature resistance, etc.) to ensure that they match the working conditions of the equipment.

Precise installation: assemble the parts in order, replace the new gasket, and tighten the bolts evenly (such as three diagonal tightening, with a torque of 80-100N·m).

Test and run-in

Idling test: After assembly, the medium is idling for 15-30 minutes; observe whether there is abnormal vibration or leakage, and ensure that the sealing surface is fully run-in.

Verification of actual operating conditions: Gradually pressurize to the rated value, continuously monitor the leakage volume, and adjust the seal preload if necessary.

Professional advice to extend the life of your seals

Regular maintenance: disassemble and inspect at least once a year, and replace aging seals in time.

Environmental optimization: Lubricating oil is filled under high-temperature conditions, and a filter screen (recommended accuracy ≥ 50 microns) is installed in the media pipeline to prevent the intrusion of impurities.

Professional service support: When complex damage or a lack of tools, it is recommended to return to the factory for repair to avoid secondary damage caused by improper operation.

Why Choose Our Rubber Seals?

Customized production: Provide a variety of materials (NBR, FKM, silicone rubber, etc.) and specifications suitable for various brands of rotary joints.

Strict quality inspection: Each batch of products has been tested for wear resistance, temperature resistance, and sealing performance and meets ISO international standards.

Quick response: Support global logistics, provide technical advice and after-sales maintenance guidance, and help you reduce downtime losses.

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