Measure and record the differential pressure across the valve using a Watts Series PG meter. CAUTION: Safety glasses should be used.

采用美国瓦茨系列PG仪器测量和记录通过阀门的压差。警告：应该使用安全眼镜。

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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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Examine the pressure meter tube and valve, pressure meter cover glass, if it is dirty, clean it with diluted hydrochloric acid.

检查压力表管道及阀门是否畅通，灵活，压力表面玻璃如有污，可用稀盐酸拭净。

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