压降指数 - 减压阀
PRESSURE DROP INDEX - PRESSURE REDUCING VALVES

　　通过从最大进口压力减去所需要的出口压力来计算压差。找出压差线上的数字，并且注意出口压力指数。这是不会落入空穴区的最低的出口压力设置。美国瓦茨自动控制阀的结构将可能导致空穴现象的阀门损坏潜在危险降低到最小程度。避免在空穴区域内持续运行。
　　Calculate the pressure difference by subtracting the desired outlet pressure from the maximum inlet pressure. Find the number on the pressure difference line and note the outlet pressure index number. This is the lowest outlet pressure setting allowed without failing into the cavitation zone. Design of the WATTS Automatic Control Valve minimizes potential valve damage that can be caused by cavitation. Avoid continued operation within the cavitation zone.

空穴图表
CAVITATION CHART

　　阀门通径选择后，在这个图表中找出进口和出口压力。如果交点落在阴影区域，则可能产生空穴。应该避免在空穴区域内持续运行阀门。请咨询美国瓦茨ACV，了解其他解决方案。
　　After selecting valve size, locate inlet and outlet pressures on this chart. If the intersection point falls in the shaded area, cavitation can occur. Operation of valves continually in the cavitation zone should be avoided. Consult Watts ACV for alternatives.