| 摘要 |
PURPOSE:To reduce the turbulence of steam flow at the downstream side of an elbow and to restrain pressure losses by providing a butterfly valve in close proximity to the downstream side of each elbow in a steam piping system. CONSTITUTION:Butterfly valves 1, 2 for turbine intermediate valves are provided in close proximity to the outlet part of elbows 3, 4 in a steam piping system. The valve shaft is so provided that the cross-sectional area perpendicular to the elbow axis is partioned into the inner side and the outer side portions. Further, full-open stoppers 5, 6 are provided, and each valve body is pressed against each stopper by the hydraulic force of a valve driving device. Thus, without providing a straightening member, the turbulence of steam flow at the downstream side of each elbow is reduced, and the pressure losses can be restrained.
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