The Selection Guide Matrix summarizes Robertshaw valve styles (two-way, three-way, flanged, leakage rates, etc.). Table 4 shows valve leakage rates and their related classifications.
Table 4
Type Leakage
Max Leakage Rate
Class
Tight shutoff
.01% of Cv
IV
–
.1% of Cv
III
.5% of Cv
II
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