... 自通风电动机：self-ventilated motor 自锁蜗轮(传动装置)：self-locking worm gear 自锁螺母，防松螺帽：self-locking nut ...
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The use of worm gear reducer, not only with self-locking butterfly board so that board butterflies stop at any position on, but also to improve the valve performance.
采用蜗轮减速器，不仅可以使蝶板具有自锁能力，使蝶板停止在任意位置上，还能改善阀门的操作性能。
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