What are the hazards of aluminum alloy valve caps?

[LePreston]

One major hazard of aluminum alloy valve caps is that aluminum is chemically unstable and prone to react with oxygen. During the oxidation process, the valve core can become stuck together, making it difficult to unscrew after prolonged use. Additionally, the tire valve stem is connected to the tire pressure monitoring sensor. If excessive force is applied when trying to unscrew it, the stem may break, requiring replacement of the entire set. However, without unscrewing the cap, inflating the tire becomes impossible. Below is more detailed information: 1. When the aluminum valve cap becomes rusted and stuck: It can be very hard to remove. You can try spraying some penetrating oil or wrapping a towel around it and using pliers to twist it off. If these methods fail, you may have to resort to more forceful measures or seek assistance from a repair shop. 2. To prevent aluminum valve caps from rusting and sticking: Rubber valve caps can be used as an alternative, but they also have drawbacks. Over time, rubber inevitably ages, and the part in contact with the wheel rim may gradually crack, deform, and lose elasticity. Therefore, under normal circumstances, valve stems should be replaced every 3-4 years, which is roughly the same lifespan as the tires. It is recommended to replace the valve stems when changing tires.