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2. Schrader valve - Wikipedia

   en.wikipedia.org/wiki/Schrader_valve

   The core has a short outer thread which is screwed into the inner thread of the stem. The visible outer thread of the stem holds the dust cap. The Schrader valve (also called American valve [1]) is a type of pneumatic tire valve used on virtually every motor vehicle in the world today. The original Schrader valve design was invented in 1891 and ...

3. Tire-pressure monitoring system - Wikipedia

   en.wikipedia.org/wiki/Tire-pressure_monitoring...

   A similar fate may befall aftermarket brass valve cores installed in their stems by an unwary technician, replacing the original specialized nickel-coated cores. Seizure to the valve stem can complicate the repair of a tire leak, possibly requiring replacement of the sensor.

4. Valve stem - Wikipedia

   en.wikipedia.org/wiki/Valve_stem

   Replacing a valve stem. A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.

5. Presta valve - Wikipedia

   en.wikipedia.org/wiki/Presta_valve

   The Presta valve (also French valve (FV) or Sclaverand valve) is a type of tire valve commonly found on high pressure bicycle inner tubes and is commonly used on tubeless setups. It consists of an outer valve stem and an inner valve body. A lock nut to secure the stem at the wheel rim and a valve cap may also be present.

6. Flat tire - Wikipedia

   en.wikipedia.org/wiki/Flat_tire

   A water-based sealant can be injected into the tire also through the valve stem. This contains less harmful chemicals and no aerosol gas. The sealant can then be driven into the tire using an air compressor. A flat tire can be repaired by a patch or plug; [4] or the tire may repair itself. Self-sealing tires work on punctures up to a certain size.

7. Earth’s core is leaking, scientists say - AOL

   www.aol.com/earth-core-may-leaking-helium...

   Ancient helium that became trapped in Earth’s core when our planet formed billions of years ago may be leaking from lava flows, according to researchers. Earth’s core is leaking, scientists ...