These automatic flow control valves are designed to give constant flow over a wide pressure range. The internal controlling mechanism has no moving part, consisting only of a flexible orifice that varies with applied pressure maintaining a constant flow rate.
The minimum PSI for the flow to be accurate is 15PSI. I did not notice this on the spec sheet when purchasing for a HWR recirculation line. Generally, the HWR pumps don't generate more than about 10PSI, which means the true flow through this metering device is going to be about 1/2 what the rating is.
Scott
MT
3 months ago
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