What types of filter sealing rings are there?

The types of filter sealing rings are mainly classified by material and structural type. The materials include multiple types of high-molecular materials such as nitrile rubber, fluorine rubber, and silicone rubber. The structural types cover O-rings, V-rings, lip seals, and others.

Classification by Material

Nitrile Butadiene Rubber (NBR): Suitable for petroleum-based hydraulic fluids, gasoline, and general industrial environments. It has strong wear resistance and low cost, with a temperature range of -40°C to 120°C.

Fluorine rubber (FKM/VITON): It has excellent high-temperature resistance (-20℃ to 250℃) and chemical corrosion resistance, and is suitable for high-demand scenarios such as diesel engines and chemical plants.

Silicone rubber (SIL): It stands out for its excellent cold and heat resistance (-55°C to 250°C), but has relatively low mechanical strength. It is mostly used in household appliances and food-grade equipment.‌‌

Triple rubber (EPDM): Resistant to ozone and high-temperature steam, commonly used in bathroom equipment and automotive cooling systems.

Polytetrafluoroethylene (PTFE): Resistant to strong corrosive media and high temperatures, commonly used in core-type/bag-type filters in extreme working conditions.

By structure classification

O-ring: A universal sealing structure that achieves sealing through compression deformation. It is suitable for static sealing and low-speed dynamic sealing.

V-ring: It relies on oil pressure to make the lip edge tightly adhere to the sealing surface. Its compressive strength can reach 500 kilograms per square centimeter. It is suitable for high-pressure hydraulic systems.

‌Lip-shaped sealing ring‌: It has a dynamic self-tightening function and is commonly found in the check valves and bypass valve diaphragms of automotive filters. The working temperature range can reach -40℃ to 175℃.

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‌Selection and Usage Notes

‌Matching of working conditions‌: The corresponding material and structure should be selected based on the type of medium (such as oil, acids, and bases), temperature range, and pressure.

‌Installation Specifications‌:

Avoid installing in the reverse direction or forcefully knocking to prevent damage to the lip edge.

Regular replacement (the cycle is usually 3000 to 5000 hours).

‌Quality Control‌: When replacing, check that the surface of the sealing ring has no cracks or grooves, and ensure that the size matches the groove.‌‌‌