| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simultaneously reduce labor, to improve working efficiency, and to improve operability, by adopting an updating method of an opening-closing valve by using a flow passage cutoff device, even under a construction condition of being unable to secure a large work space on the outside of the opening-closing valve. <P>SOLUTION: A flow passage cutoff means D is arranged for switching to a state of cutting off a flow passage by relative movement operation of an outside operation shaft 31 and an inside operation shaft 32. Both respective operation shafts 31 and 32 are composed of outside divided operation shafts 31A-31C and inside divided operation shafts 32A-32C divided into a plurality. Connecting parts 50-53 mutually detachably connected from the operation shaft axis direction are respectively formed in an adjacent end part of the outside divided operation shafts and an adjacent end part of the inside divided operation shafts. Among the connecting parts 50 and 51 making a pair on the outside divided operation shaft side, an inner peripheral surface of the connecting part 51 positioned inside in the radial direction, is formed as a guide surface 51a for guiding the relative movement in the axial direction of the inside operation shaft 32. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
