磷尽管发挥的作用较小但也有类似功效，都是为了保护发电机的阀动装置。
The phosphorus plays a similar, though lesser, role in protecting the engine’s valve gear.
内置的止动装置为动力执行机构提供行程保护，并且作为参考坐标在开启和关闭位置定位阀瓣。
Internal stops provide positive over travel protection for power actuated valves and act as a reference to position the discs in the open and closed positions.
—使得阀杆具有操作空间，配置整体的旋转止动装置，用于隔热绝缘，面板安装，或较浅的水下应用。
Provide handle clearance, with the integrity of turning-stops, for insulating, panel-mounting, or shallow submerged applications.
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