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2. Zone valve - Wikipedia

   en.wikipedia.org/wiki/Zone_valve

   The motor is simply driven until the valve hits a mechanical stop, which stalls the motor. In an alternative design, the motor continues to turn, while a slip clutch allows the valve to be pushed against a mechanical stop. Usually, the valve remains open as long as power is supplied, and a strong spring closes it when power is cut.

3. Underground pneumatic boring - Wikipedia

   en.wikipedia.org/wiki/Underground_pneumatic_boring

   A valve controls airflow into the piston chamber, forcing the piston and piercing tool forward. The valve then shuts, and the piston retreats. The valve reopens, and the cycle repeats. The friction between the tool and the earth keeps the tool from sliding back. Tool speed is controlled by manipulating the air supply to the tool. This air ...

4. Valve guide - Wikipedia

   en.wikipedia.org/wiki/Valve_guide

   In the 1980s, many U.S. production engine remanufacturers began reaming valve guides, rather than replacing them, as part of their remanufacturing process. They found that by reaming all the valve guides in a head to one standard size (typically 0.008 in. diametrically oversized), and installing remanufactured engine valves having stems that are also oversized, a typical engine head can be ...

5. Pneumatic valve springs - Wikipedia

   en.wikipedia.org/wiki/Pneumatic_valve_springs

   Pneumatic valve springs are metal bellows filled with compressed air [1] used as an alternative to the metal wire springs used to close valves in high-speed internal combustion engines. This system was introduced in Formula One in 1986 with the Renault EF-Type .

6. Air suspension - Wikipedia

   en.wikipedia.org/wiki/Air_suspension

   The design consisted of a left and right air spring longitudinally channeled nearly the length of the vehicle. The channels were concaved to receive two long pneumatic cushions. Each one was closed at one end and provided with an air valve at the other end. [7] From 1920, Frenchman George Messier provided aftermarket pneumatic suspension ...

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