The quarter turn graduations on the sleeve, with the scribed line on the stem, provide for approximate flow measurement.

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。

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NOTE: the valve is shipped in the closed position. The indicator on the plastic sleeve is aligned with the vertical scribed line on the stem.

注意：阀门装运时是处于关闭位置。塑料套筒上的指示器与阀杆上的垂直刻线对齐。

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