Read the pressure drop across the valve with a Watts Series PG meter.

利用美国瓦茨系列PG仪器读出通过阀门的压降。

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The leakage through the valve causes the pressure drop.

通过阀的泄漏引起的压力降。

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The leakage through the valve causes the pressure drop.

通过阀的泄漏引起的压力降。

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