| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple-to-configure and easy-to-inspect novel pipe opening/closing valve for giving valve element opening/closing thrust to a valve rod by rotating a yoke sleeve engaged with the threaded non-rotational valve rod. <P>SOLUTION: A screw engagement part where the yoke sleeve and a yoke are engaged with each other is normally threaded, and a screw engagement part where the lower part of a yoke sleeve center shaft of the yoke sleeve and the valve rod are engaged with each other is inversely threaded. When a driving part in the upper part of the pipe opening/closing valve is rotated in the opening direction of the opening/closing valve, the fixed valve rod screw-engaged with the yoke sleeve in an inversely threading manner is moved upward to bring the opening/closing valve into an opening state. A rotational connection part to the yoke is formed in a screw-engagement structure to eliminate the need for a site which is subjected to contact pressure to fix the yoke sleeve, and for a sliding plate. <P>COPYRIGHT: (C)2012,JPO&INPIT |
