31. An 80 m wide auxiliary spillway was constructed, two new 900 mm butterfly valves installed and existing valves descaled and motorised. 32. If pressure rose in the ballonet, a spring would pressure the spindle of the butterfly valve to turn, relieving the pressure. 33. The Justice Department charged that, without the sale, Tyco would have the ability to thwart competition in the market for butterfly valves . 34. In the late 1940s, when sales of butterfly valves began to grow, an additional plant was purchased for the manufacture of valves. 35. The Justice Department charged that, without the sale, the new Tyco would be able to thwart competition in the market for butterfly valves . 36. During idle these butterfly valves were closed, so a bypass port and the IAC valve were used to control the intake of air. 37. When icing conditions are present, carburetor heat is required to prevent icing around the butterfly valve from the pressure drop at that point. 38. For air intake shut down, two distinct types are commonly utilized, i . e . butterfly valves and swing gate or guillotine valves. 39. The engine will be rotating fast because the road wheels and transmission are moving quickly, but the butterfly valve will be fully closed. 40. Butterfly valves or dampers were fitted to the top of each vertical air pipe, so that the amount of cooling could be regulated.
