在套筒上四分之一转的刻度，以及阀杆上的刻痕，显示大约的流量测量。
The quarter turn graduations on the sleeve, with the scribed line on the stem, provide for approximate flow measurement.
四分之一转，双动和弹簧回位类型，具有全封闭结构，没有外部活动连接。
Quarter turn, double acting and spring return type with a totally enclosed design and no external moving linkages.
阀杆日开始，你给一个四分之一转，再算上三辐条和加强四分之一转，因此左右车轮上。
Starting at the valve stem you give a quarter turn, and then count three spokes and tighten a quarter turn, and so on around the wheel.
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