—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.
—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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