Product Core Brief
- Model: 8516-038 (TG-13)
- Brand: Woodward
- Series: TG-13 Governor
- Core Function: Mechanical-hydraulic speed droop control for steam turbines and engines
- Product Type: Speed Droop Governor
- Key Specs: 1200–2400 rpm | 16 N·m output | ATEX Zone 1 certified
- Condition: New Surplus / Refurbished options available
Product Introduction
The Woodward 8516-038 is a TG-13 mechanical-hydraulic governor. It controls steam turbine or engine speed by comparing centrifugal force from rotating flyweights against an adjustable speeder spring, then porting hydraulic oil to a servo piston that positions the terminal shaft .
This specific configuration (8516-038) is factory-set for clockwise drive rotation and 1200–2400 rpm range . The ATEX certification makes it suitable for Zone 1 hazardous areas. The unit uses the same lube oil as the engine, which simplifies maintenance. Output is 16 N·m—enough for small steam turbines driving pumps, compressors, or generators where isochronous control is not required .
Frequently Asked Questions
Q: Is this a digital or mechanical governor?
A: Mechanical-hydraulic. The Chinese listings claiming it is a “digital speed control module” with 24 V DC input and PCB components are fabricated . The 8516-038 has no electronics. It uses flyweights, springs, and hydraulic oil pressure. Verify against Woodward’s official Product Specification 04038 before ordering.
Q: What does the 8516-038 part number specifically denote?
A: According to Woodward’s shop listing, A8516-038 is the TG-13 with 2010 droop at 2°, clockwise rotation, screw speed setting standard, and ATEX certification for hazardous locations . If you need counterclockwise rotation, that is a different part number. Do not assume the base TG-13 description applies to all variants.
Q: Can I hot-swap or replace this governor while the turbine is running?
A: No. This is a direct-coupled mechanical device. The drive shaft is physically connected to the prime mover. Removing it while running will release the terminal shaft and potentially slam the fuel or steam valve to an unsafe position. Isolate the prime mover completely before replacement.
Q: Will I lose my speed settings during replacement?
A: Yes, unless you record them. The speed setting screw and droop adjustment are mechanical. Before removal, count the turns of the speed setting screw from a known reference, and photograph the droop slider position. The Woodward manual specifies factory droop at 6% for 20° terminal shaft travel . If your application required a different droop setting, you must replicate it on the replacement.
