When the air pressure seal ring in the rubber sealant is damaged, you can choose a remedial method based on the degree of damage and the specific situation. Minor damage can be repaired, while severe damage is recommended to be replaced. The following are the specific methods and operation points:

I. Repair methods for minor damage

Applicable to small cracks, local wear, or edge damage. After repair, the sealing performance needs to be tested.

1. Sealant repair

Steps:

Clean the surface of the sealant ring, remove oil stains and impurities.

Select a special rubber sealant (such as silicone sealant), apply it evenly to the damaged area to fill the gap.

Let it stand and cure (according to the instructions of the sealant, usually it takes several hours to one day), ensure complete adhesion.

Applicable scenarios: Static sealing or low-pressure dynamic sealing, such as pipe interfaces, container covers, etc.

Note: The sealant must be compatible with the rubber material to avoid corrosion.

2. Adhesive repair

Steps:

Use sandpaper to sand the damaged surface to increase the bonding area.

Apply high-strength rubber adhesive (such as 496 glue) and align the cut edges and press them together.

Fix for a period of time (such as using a clamp to hold), wait for the glue to fully cure.

Applicable scenarios: Rubber sealant ring fracture or large area wear.

Note: The cut edges need to be smooth, the glue applied evenly, and avoid air bubbles.

3. Temporary repair (tape/repair patch)

Steps:

Clean the damaged area, apply an oil-resistant tape or repair patch, and press the edges down.

Test the sealing performance to ensure no leakage.

Applicable scenarios: Emergency repair, such as temporary leak sealing or low-pressure scenarios.

Note: The tape needs to be resistant to chemical corrosion, and it is recommended to replace it after long-term use.

II. Repair methods for medium damage

Applicable to local deformation, curling, or partial structural damage. It is necessary to combine tools for reinforcement.

1. Chain method/loop method

Steps:

Prepare small pieces of scrap iron chain or iron wire, polish the damaged area until smooth.

Wrap the iron chain/iron wire around the damaged part, use an iron clamp to press it tightly, forming a supporting structure.

Test the sealing performance to ensure no deformation after reinforcement.

Applicable scenarios: Medium-sized damage, such as partial collapse or curling of the sealant ring.

Note: The iron chain/iron wire needs to match the size of the sealant ring to avoid excessive compression.

2. Universal clamp method

Steps:

Cut a small spring, insert it into the iron filings and clamp it at the damaged part of the sealant ring.

Adjust the spring tension to make the sealant ring return to its original shape.

Applicable scenarios: Small-sized sealant ring partial damage, such as valve sealant ring.

Note: The spring needs to be corrosion-resistant to avoid rusting that affects the sealing.

III. Replacement methods for severe damage

Applicable to aging, large cracks, or leakage after repair of the sealant ring, it is necessary to replace completely.

1. Replacement steps

Disassembly: Carefully remove the original sealant ring, avoid damaging the surrounding components (such as grooves, metal parts).

Cleaning: Use a solvent to clean the sealing surface, remove residual impurities and old sealant materials.

Installation:

Confirm that the new sealant ring specification is consistent with the old piece (size, material, hardness).

Apply lubricating grease to the sealant ring or groove to reduce installation friction.

Press the sealant ring evenly into the groove, avoid twisting or stretching.

Test: Apply pressure to test the sealing performance, observe if there is leakage.

2. Precautions

Material matching: Select a corrosion-resistant and temperature-resistant rubber material (such as nitrile rubber, fluorine rubber) according to the working medium (such as oil, water, gas).

Installation direction: For sealant rings with direction requirements (such as lip-shaped sealant rings), install them according to the arrow indication.

Pre-compression amount: Ensure that the sealant ring has a certain pre-compression amount to maintain sealing pressure.

IV. Special scenarios for repair techniques

1. Heating to soften installation

If the sealant ring is too hard to install, soak it in hot water or use a hair dryer to heat it until it becomes soft, then press it into the groove evenly.

Note: Avoid local overheating that causes rubber aging.

2. Steel ring auxiliary installation

When installing a sealant ring with a steel ring, gently stretch the sealant ring to deform or apply lubricant to reduce friction, do not use a screwdriver to pry the damaged sealant ring.

V. Preventive measures 

1. Regular inspection: Regularly check the condition of the sealing ring and replace the aged or damaged parts in time.

2. Avoid overpressure: Ensure that the system pressure is within the range that the sealing ring can withstand, and prevent excessive compression and deformation. 

3. Reduce friction: In dynamic sealing scenarios, maintain lubrication to minimize wear.