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SIZING CONSIDERATIONS While most Series 8100 valves are line sized, there are two factors that should be checked. Maximum flow rate should not exceed 25 ft/sec, in other words don’t use too small a valve. At the same time, you don’t want the valve so large that when it opens, it drops the system pressure so low that there is not enough pressure to close the valve when high level is reached. Our ValveMaster selection and sizing software covers this in detail. However, if you do not have the software, sizing within the flow limitations shown in the following table should result in satisfactory operation. 
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