B&G Balancing Valves

Bell and Gossett balancing valves are hydronic system components used to measure, set, and maintain design flow rates in individual circuits of multi-zone heating and cooling systems. The Bell and Gossett balancing valve lineup covers three product families: the Circuit Setter CB series for lead-free manual balancing, the Thermoflo Balancer TB series for visual flow indication with built-in flow measurement, and the HydroTrol HT series for gravity flow prevention and zone isolation in non-potable hydronic systems. CB series Circuit Setters are available in 1/2", 3/4", and 1" lead-free NPT configurations. Thermoflo Balancers cover 3/4" and 1" with dual GPM/LPM scale indication, designed for water with a pH range of 7 to 9. HydroTrol HT flow control valves are rated to 150 PSI maximum working pressure and 250°F maximum operating temperature, for non-potable hydronic applications only.

Circuit Setter CB Series Balance Valves

Bell and Gossett Circuit Setter CB series balance valves are lead-free NPT balancing valves for manual hydronic circuit balancing in potable and non-potable water applications. The CB series is available in three sizes: CB-1/2 (part 117414LF, 1/2" NPT), CB-3/4 (part 117415LF, 3/4" NPT), and CB-1 (part 117416LF, 1" NPT), all lead-free. Circuit Setter valves allow the installer to manually throttle flow in each circuit to achieve design GPM, and include a memory stop feature to return to a set position after full closure. CB series valves are a standard specification for hydronic systems where each zone circuit requires independent balancing to meet design flow conditions.

Thermoflo Balancer TB Series

Bell and Gossett Thermoflo Balancer TB series valves combine an indicating flow meter with a balancing function, allowing the installer to read flow directly in GPM or LPM from a dual-scale visual indicator without requiring external test equipment. The TB-3/4 (part 127001) serves 3/4" piping and can be adapted for 1/2" and 1" piping. The TB-1 (part 127002) serves 1" piping and can be adapted for 3/4", 1-1/4", and 1-1/2" piping. Thermoflo Balancers can be installed in any orientation with the directional arrow pointing downstream, are designed for water with a pH range of 7 to 9, and can be serviced without breaking the piping connections, per Bell and Gossett product documentation on SupplyHouse.

HydroTrol HT Flow Control Valves

Bell and Gossett HydroTrol HT flow control valves prevent zone overheating from gravity circulation in hydronic heating systems and support summer-winter operation of indirect water heaters. HT valves are for non-potable hydronic applications only and do not comply with the Safe Drinking Water Act. Available in 3/4" NPT (part 107035), 1" NPT (part 107037), and 1-1/4" NPT (part 107038), all with bronze body and non-ferrous internals. Maximum working pressure is 150 PSI and maximum operating temperature is 250°F, per SupplyHouse product listings. The HT valve includes an elastomer seal for positive shut-off and can be installed in horizontal or vertical orientation.

How to Choose Bell and Gossett Balancing Valves

The application function determines the correct product family. Circuit Setter CB valves are manual balancing valves for setting and locking flow to design GPM without a built-in flow measurement display. Thermoflo Balancer TB valves include a visual flow meter for direct flow reading during balancing, eliminating the need for a separate flow measurement tool. HydroTrol HT valves are not balancing valves; they are flow control check valves for preventing gravity circulation in zones that are not calling for heat.

Potability is a hard split between product families. Circuit Setter CB valves are lead-free and suitable for potable water applications. HydroTrol HT valves are non-potable only and must not be used in any system providing water for human consumption. Thermoflo Balancer TB valves are designed for use with water at a pH of 7 to 9, consistent with hydronic system chemistry rather than domestic water.

Pipe size and adapter range matter for Thermoflo Balancer selection. The TB-3/4 covers 3/4" with adapters for 1/2" and 1" piping. The TB-1 covers 1" with adapters for 3/4", 1-1/4", and 1-1/2" piping. Selecting the correct TB model for the intended pipe size avoids a mismatch between the valve body and the installed connection size.

For anyone asking whether Bell and Gossett balancing valves can be serviced in place: the Thermoflo Balancer TB series can be serviced without breaking the piping connections, per Bell and Gossett product documentation. Circuit Setter CB valves require isolation to service the internals. HydroTrol HT valves include an elastomer seal providing positive shut-off, which eliminates the need for a separate isolation valve in some configurations.

FAQs

What is the difference between the Bell and Gossett Circuit Setter CB and Thermoflo Balancer TB?
The Circuit Setter CB series is a manual balancing valve without a built-in flow indicator; flow must be measured with external test equipment or calculated from pressure drop. The Thermoflo Balancer TB series includes a visual flow meter with a dual GPM/LPM scale, allowing direct flow reading during balancing without additional instruments. Both are used for hydronic circuit balancing, but the TB provides an integrated measurement function that the CB does not.

What pipe sizes do Bell and Gossett Circuit Setter CB valves cover?
Bell and Gossett Circuit Setter CB series lead-free balance valves are available in 1/2" NPT (CB-1/2, part 117414LF), 3/4" NPT (CB-3/4, part 117415LF), and 1" NPT (CB-1, part 117416LF), per SupplyHouse product listings. All three sizes are lead-free construction.

What pipe sizes can the Thermoflo Balancer TB-3/4 and TB-1 be adapted to?
The Bell and Gossett Thermoflo Balancer TB-3/4 (part 127001) is a 3/4" valve that can be adapted for installation in 1/2" and 1" piping. The TB-1 (part 127002) is a 1" valve that can be adapted for installation in 3/4", 1-1/4", and 1-1/2" piping, per Bell and Gossett product documentation on SupplyHouse.

What are the pressure and temperature ratings of the Bell and Gossett HydroTrol HT valve?
Bell and Gossett HydroTrol HT flow control valves are rated to a maximum working pressure of 150 PSI (10 bar) and a maximum operating temperature of 250°F (121°C), per SupplyHouse product listings. HT valves are for non-potable hydronic heating systems only and do not comply with the Safe Drinking Water Act.

Can Thermoflo Balancer valves be installed in any orientation?
Bell and Gossett Thermoflo Balancer TB series valves can be installed in any position as long as the directional arrow on the valve body points downstream, per Bell and Gossett product documentation on SupplyHouse. The Thermoflo Balancer can also be serviced without breaking the piping connections, making it accessible for maintenance in any installed orientation.