从阀杆上拆卸手柄，向上提升并将手柄从阀体上取出。
Remove the handle from the stem by pulling upward and away from the body.
阀杆也应该在顶部配置方向指示器，用于当手柄拆卸下来时指示阀瓣的位置。
The shaft also shall have a directional indicator on top to indicate disc position when the handle is removed.
将手柄恢复到正常位置，则“压杆”上的压力就得到缓解，使得调节阀能够保持正常的系统压力。
Returning the lever to its normal position releases the tension on the rod permitting the valve to maintain normal system pressure.
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