Gland eye bolts: eye bolts are securely fastened to the bonnet yet swing away to permit easy access to the stuffing box.
压盖有眼螺栓：有眼螺栓能够安全地紧固阀盖，也可以旋转拆卸，便于方便容易地进入填料函。
2
The bonnet and packing box of low temperature service instrument in-line valves shall be extended bonnet type or heat traced, if necessary, to avoid freezing of valve stems.