Woodward TG-13 and TG-17 Governors TG611-13 and TG611-17 Governors

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.

The governors are available with either a cast-iron case or a die-cast aluminum case. 

Speed droop is required for stable governor operation. Droop is factory set, but internally adjustable. 

Two means of speed setting are available. Screw speed setting is standard. Lever speed setting is 

optional and provided by a serrated shaft assembly extending from both sides of the cover. 

Governor drive shaft rotation for both governors is single direction only. In both the cast iron and the die

cast aluminum governors, rotation can be changed in the field. In the cast iron governor, it must be 

changed internally, and in the die-cast aluminum governor, it can be changed externally by removing four 

screws and rotating the pump housing 180 degrees (see Chapter 2). 

Governor maintenance is minimal due to few moving parts, weatherproof design, and self-contained oil 

supply. The governor drive shaft operates a gerotor oil pump. Internal oil pump pressure is regulated by a 

relief valve/accumulator. The oil sight gauge installed on each side of the governor case makes oil 

condition and oil-level checking simple.