| 摘要 |
<p>A valve body has a stem passage (12) rotatably receiving a valve stem (C). A packing (54) surrounds the stem in the passage and a packing nut (90) threaded on the stem applies axial force to radially expand the packing into sealing engagement with the stem and passage wall. Controlled slippage components (52, 70, 80a, 80b) interposed between the packing (54) and packing nut (90) allow rotation of the stem and packing nut without any rotational sliding movement against an end face of the packing. A packing support ring (52) engages the end face of the packing (54) adjacent the packing nut (90) and includes a chevron surface (60) for radially expanding the packing. A gland (70) engages the support ring (52) and a pair of reversely positioned spring washers (80a, 80b) are interposed between the gland (70) and packing nut (90). The chevron surface (60) of the support ring (52) incudes notches (92) for gripping the packing (54) to prevent relative sliding movement therebetween. A handle (102) is attached to the stem (C) by a handle nut (106), and a spring washer (80c) interposed between the handle (102) and handle nut (106) prevents loosening of the handle nut (106). </p> |
