An bronze yoke sleeve provides corrosion resistance and assures easy operation. An added grease fitting provides lubricant to the stem thread and yoke sleeve.

• 青铜轭架轴套不但具有耐腐蚀性能，而且还更加容易操作。此外，还配置黄油嘴以方便润滑阀杆螺纹和轭架轴套。