| 摘要 |
A restrictor collar for installation in the leakage water discharge pipes of Francis and pump turbines as well as pumps, which is simple in construction, is easily adjustable in the cross section thereof, and has increased security against unintentional changes of the setting thereof. Two orifice plates or disks are coaxially disposed in the pipe at a separation point therein, and each plate has an eccentrically disposed opening therein. One of the plates is fixed in position, and the other is rotatable relative thereto and in abutting engagement thereagainst. The openings are preferably circular in shape and at least partially overlap one with the other. The rotating disk, which is pressed against the fixed disk by means of a releasable flange, has insert holes radially disposed in the periphery thereof.
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