1. The sealing gap is large and it has strong adaptability. Ordinary O-rings can only seal very small gaps. The inflatable ring can seal gaps of 0.5 to 5mm or even larger, with low requirements for processing accuracy. 2. It can be actively opened and closed, and is flexible to use. Inflation: Expansion and compression to achieve sealing/holding/blocking Deflation: Rapid contraction and reset, without friction or jamming It is particularly suitable for scenarios with frequent opening and closing and where the workpiece needs to pass through. 3. The sealing surface has good adaptability. It can self-adapt and fit for non-round, elliptical, slight deformation, rough surfaces, and flange misalignment. Ordinary hard seals are difficult to achieve this. 4. The pressure is controllable and the sealing force can be adjusted. The expansion force can be controlled by adjusting the air pressure. It can be used for both light and heavy loads, and it is not likely to damage soft workpieces (plastics, glass, thin-walled parts). 5. There is no friction or wear, and the lifespan is long. It only comes into contact during inflation, and it does not have friction in non-working states. It is much more durable than conventional sealing rings. 6. Installation is simple and the versatility is high. No complex and precise grooves are needed. Simple grooves or steps can be used for installation. It can also be made into square, rectangular, or special-shaped rings.

1. First, let's look at the installation methods: 1. Outer diameter expansion pneumatic sealing ring: After inflation, it expands outward and presses against the outer cylindrical cavity, with the sealing surface on the outside. It is suitable for large gaps and large dimensional tolerances. 2. Inner diameter expansion pneumatic sealing ring: After inflation, it tightens inwardly. It has strong clamping force. 3. End face (axial) expansion pneumatic sealing ring: After inflation, it bulges and expands along the height direction, pressing against the opposite plane to form a seal. 2. Select the material based on the usage environment: 1. Silicone: Use imported silicone material. It is resistant to high and low temperatures, -60℃ to 300℃. 2. Ethylene Propylene Diene Monomer (EPDM): Resistant to acid and alkali corrosion, aging-resistant, ozone-resistant, and heat-resistant. Suitable temperature range: -60 to 130℃, but not resistant to oil-based media. 3. Nitrile Butadiene Rubber (NBR): Good oil resistance, high wear resistance, suitable for environments with oil contamination. Poor in low-temperature resistance and ozone resistance. 4. Fluorine rubber: Resistant to high temperatures, oil, acids and alkalis, corrosion-resistant, all-in-one material. 3. Select the size of the gap: 1. Small gap: Ordinary circular cross-section 2. Large gap, large tolerance: Select rectangular/irregular cross-section, or add a high expansion amount of the outer expansion sealing ring 3. Irregular surface, uneven surface: Select custom-shaped pneumatic sealing ring 4. Select the installation space: 1. Sufficient slot width and depth: Select standard O-type pneumatic sealing ring 2. Narrow space: Select flat, thin pneumatic sealing ring 3. Requires quick disassembly and assembly: Select open type, snap type