Bell & Gossett has developed a new energy-saving balancing valve that maintains the set flow rate within +/-5%, regardless of pressure fluctuation in the system, thus saving pump energy. 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. Source: worldpumps.com
Source:
http://www.worldpumps.com/view/23711/bell-gossett-balancing-valve-saves-pump-energy/
