Open VB to reestablish first check valve differential pressure. Close VB. Record pressure differential.
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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。
Record this as the opening differential pressure of the relief valve.
将这个读数记录为安全阀的开启差压。
When connected in series a squarer to electromagnetism feedback system of differential pressure their relation will be linear, which is convenient to display, record and adjust.
若在差压变送器的电磁反馈机构中串接一个电流平方器，就会使输出电流与被测流量呈线性关系，便于显示、记录、调节。
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