Description 

The Woodward TG-13/TG-17 and TG611-13/TG611-17 are mechanical-hydraulic speed droop governors 

for controlling steam turbines—applications where isochronous (constant-speed) operation is not 

required. 

The TG-13/TG-17 and TG611-13/TG611-17 governors have a full 40 degrees of maximum terminal-shaft 

travel. Recommended travel from the no load to the full load position is 2/3 of full governor travel. 

See Figure 1-1 for a graphic representation of maximum work capacity for the governors and related 

governor terminal shaft travel information. 

The TG-13/TG611-13 governor operates with 1034 kPa (150 psi) internal oil pressure, and the TG

17/TG611-17 operates with 1379 kPa (200 psi) internal oil pressure. 

Either governor is set to the speed range specified by the customer at time of order. The high-speed 

governor (4000 to 6000 rpm) may require a heat exchanger in some applications (see end of Chapter 2, 

“When is a Heat Exchanger Necessary?”). Both governors are capable of controlling at lower-than

specified speed range with some loss of output torque and performance. The governor should not be run 

at a speed greater than the range specified because of heat rise and component wear issues.