21. The prosthesis does not look like a leg-- more like curved metal bars with air valves and binding mounts. 22. The air-scouring process basically involves the pushing of a ball within the air valve downwards to release the air faster. 23. In 2009, a viewing area for visitors was arranged; it offers views of the reach upstream, central and air valves . 24. If the water level is allowed to rise, it may flood the system and trickle through the radiator air valves . 25. Typically, the air valve is linked to metering rods which are raised as the air valve opens, thereby adjusting secondary fuel flow. 26. Typically, the air valve is linked to metering rods which are raised as the air valve opens, thereby adjusting secondary fuel flow. 27. As well as the spillway, there are six pipes embedded into the centre of the dam, controlled automatically by system of air valves . 28. Tenor, baritone and bass concertinas often have an air valve in the position that would otherwise be occupied by the instrument's highest note. 29. As the airflow increases through the secondary bores, the air valves are pushed down, rotating a cam that lifts the secondary metering rods. 30. The fork also featured a Schrader-type air valve which allowed air assistance from 0-6 psi to increase the spring rate in the fork.
