The Circuit Sentry Flo-Setter has a gallons per minute (GPM) dial that requires no adjustments once it is set, even if the system is changed. The integral P/T plugs allow verification of required differential pressure.

Bell & Gossett
's valve can also improve coil efficiency and has a lockable handle that allows adjustment to the design or required flow rate should specifications change. No minimum straight pipe lengths are required before or after the valve.