Manual Control knob on governor
Pneumatic Direct or reverse. With 21 kPa (3 psi) minimum and 690 kPa (100 psi)
maximum control air pressure. Ratio of max. to min. air control signal
pressure must be greater than 2.5 to 1, but less than 10 to 1. Typical
pneumatic ranges are 21 to 103 kPa (3 to 15 psi) and 69 to 414 kPa (10 to
60 psi). 0.25 inch (6.4 mm) SAE air connection.
Bellows Selections (for pneumatic speed setting)
Bellows 400 mm² (0.62 in²) 194 mm² (0.3 in²) 77 mm² (0.12 in²)
Max signal pressure 138 kPa (20 psig) 138 to 345 kPa (20 to 50 psig) 345 to 827 kPa (50 to 120 psig)
Min signal pressure 21 kPa (3 psig) 48 kPa (7 psig) 69 kPa (10 psig)
Governor Drive
Input Shaft Keyed or 1.125” - 48 serrated.
Recommended Speed Range 250 rpm minimum to 1000 rpm maximum. Speeds in excess of 1000 rpm
are available but require single direction rotation. Oil coolers may also be
required. Please consult Woodward.
Maximum Speed Range The absolute minimum speed is 200 rpm. The absolute maximum speed is
1600 rpm.
Power Requirement Drive power for different types of PG governors will vary depending upon
speed, internal pump pressure, pump volumetric displacement, pump
efficiency, and oil viscosity. Contact Woodard if further information is
required.
Rotation Fixed clockwise, fixed counterclockwise, or reversible
Output
Power Cylinder Type and Travel Linear with 1-inch (25 mm) maximum travel or rotary with 30 degrees
maximum travel. When making connection to engine or turbine linkage, use
2/3 of the available governor terminal shaft travel between no load and full
load. Split overtravel at each end so that the governor can shut down the
prime mover and also give maximum fuel when required.
Maximum (stalled) Work Capacity:
Governor Operating Oil Work Capacities
Pressure Servo 16 J (12 ft-lb) Servo 39 J (29 ft-lb) Servo
690 kPa (100 psi) (std.) 16 J (12 ft-lb) 39 J (29 ft-lb)
1379 kPa (200 psi) 33 J (24 ft-lb) 79 J (58 ft-lb)
Usable Work Standard governors, 11 J (8 ft-lb) or 2/3 of maximum work
Pilot Valve
Plunger Movement Balanced between ballhead centrifugal force and speeder-spring force
Bushing Rotated integrally with governor drive shaft
Porting 4 round or 3 slotted
Control Characteristics
Steady State Speed Band ±0.25% of rated speed (under normal operating conditions)
Ballhead Assemblies Solid or spring driven oil damped
Operating Temperature Continuous operating temperature is 60 to 93 °C (140 to 200 °F). Consult
Woodward beyond these limits. Hydraulic pour point must be below lowest
expected starting temperature.
Hydraulic System
Oil SAE 10 to 50 oil depending on temperature
Viscosity 100 to 300 SUS under normal operating conditions
Self-Contained Sump Capacity Approximately 1.4 L (1.5 qt)
Relief Valves 690 to 1379 kPa (100 to 200 psi)
Operating Pressure 690 kPa (100 psi) normal, 1379 kPa (200 psi) optional
