| 摘要 |
PROBLEM TO BE SOLVED: To show the sound silencing effect and the noise reducing effect as same as a conventional muffler in a large steam control valve with the structure, in which a supporting rib is eliminated, by providing slits having the same effect with a muffler in a tip of a main valve plug and a valve seat of a valve. SOLUTION: In a large steam control valve, the steam 1 flowed from a steam pipe is flowed out from a lower part when a main valve plug 2 is moved upward and downward by a valve rod 4 and the valve is slightly opened. In this case, a tip of the main valve plug 2 is provided with a slit 10, and an opposite valve seat is provided with a slit 11 so as to be engaged with each other. At this stage, the slit 10 is formed with the angleα, and the valve seat side slit 11 is formed with the angleβso as to satisfy the formulaα-β=0-30 deg.. The steam 1 is flowed between the slits 10, 11 at the time of pulling up the valve rod 4 for slight opening of the valve, and a passage, which is widened toward the end, is formed so that the flowed liquid such as the steam is expanded for flowing so as to show the sound deadening effect and the noise reducing effect as same as a muffler.
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