| 摘要 |
<p>PURPOSE:To miniaturize a structure outside the pipe line as small as possible, by operating a valve in making a turning shaft of a rotator retractable by rotation of the rotator installed in a tubular passage. CONSTITUTION:A coil group 2 for rotating field generation is set up as surrounding a part outward a wall 1 of a circular sectional tubular passage. A rotator 4 being supported and positioned by two fixtures inside the tubular passage according to a direction of an electric current to be fed to this coil group, voltage, frequency and a waveform, is rotated. At the one end side of a shaft 5 of the rotator 4, there is provided with a screw part 6, and it is engaged with an inside screw part 8 of a valve body 7, constituting a slide screw part. With rotation of the rotator 4, this slide screw part is fixed to the wall 1 and in cooperation with a guide plate 9 checking rotation of the valve body 7 and making it go straight, whereby the valve body 7 and a valve seat 10 are fitted together and detached.</p> |
