| 摘要 |
A handwheel has a hub and a projecting portion extends axially from the hub and is of one piece therewith. An axial bore in the projecting portion is tapped and the projecting portion is provided in its outer peripheral surface with an annular groove. A valve-housing has a passage accommodating the projecting portion and a plurality of bearing-ring segments are confined in the groove with retaining means retaining the projecting portion and ring segments in the passage. A valve spindle extends through the passage and has a threaded portion meshing with the threads in the tapped bore.
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