PGA Governor

Product Specification<br />

36701 (Rev. E)<br />

Applications<br />

<strong>PGA</strong> <strong>Governor</strong><br />

Pressure Compensated Mechanical <strong>Governor</strong><br />

The <strong>PGA</strong> <strong>Governor</strong> controls speed or power output<br />

of prime movers used for propulsion, power<br />

generators, and propeller pitch on marine<br />

applications, locomotives, and off-road vehicles.<br />

A wide variety of limiters and other accessories<br />

makes the <strong>PGA</strong> governor extremely versatile. The<br />

pneumatic speed reference setting makes the<br />

governor economical to install and easy to maintain.<br />

The self-contained hydraulic oil supply makes the<br />

governor easily maintained in almost any<br />

installation environment.<br />

Pneumatic Speed Setting<br />

Standard system uses a 690 kPa (100 psi) system.<br />

A 1379 kPa (200 psi) system is optional.<br />

<br />

<br />

<br />

Isochronous or<br />

droop control<br />

16 to 678 J (12 to<br />

500 ft-lb) output<br />

capacities<br />

Rotary or linear<br />

output<br />

Bellows Selection<br />

Bellows<br />

Max<br />

signal<br />

pressure<br />

kPa (psig)<br />

Min<br />

signal<br />

pressure<br />

kPa (psig)<br />

400 mm²<br />

(0.62 in²)<br />

138<br />

(20)<br />

21<br />

(3)<br />

194 mm²<br />

(0.3 in²)<br />

138–345<br />

(20–50)<br />

48<br />

(7)<br />

77 mm²<br />

(0.12 in²)<br />

345–827<br />

(50–120)<br />

69<br />

(10)<br />

<br />

<br />

<br />

Integral power<br />

servos<br />

Pneumatic or<br />

manual speed<br />

setting<br />

Self-contained<br />

sump<br />

Description<br />

The <strong>PGA</strong> is a pressure compensated, hydraulic governor that uses an air signal to<br />

establish the engine speed setting of the governor.<br />

An internal oil pump, relief-valve, and accumulator system controls governor<br />

operating pressure. A self-contained sump stores oil and reduces the possibility of<br />

contamination from outside sources.<br />

Oil flow to and from the governor power cylinder assembly is controlled by a<br />

centrifugal flyweight and pilot-valve assembly. The power cylinder (servomotor)<br />

positions the fuel racks, fuel valve or steam valve of the engine or turbine.<br />

A pneumatic signal operates a bellows (direct or reverse) to change the engine<br />

speed setting of the governor. Manual speed adjustment may be made with a knob<br />

on the governor. An adjustable compensation system provides stability.

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Optional Features<br />

Woodward 36701 p.2<br />

Optional features are used to adapt the <strong>PGA</strong> governor to most operating conditions and to control loads according to operating<br />

conditions.<br />

Heat Exchanger<br />

A heat exchanger helps maintain governor temperature below 200 °F. <strong>Governor</strong> temperature depends on ambient temperature,<br />

governor drive speed, operating internal pressure, etc.<br />

Shutdown Devices<br />

Lubricating oil pressure failure shutdown devices and air, oil, or water shutdown devices (either high or low pressure) can provide<br />

engine protection. An energize or de-energize solenoid shutdown device is also available.<br />

Booster Servomotor<br />

A booster servomotor, mounted externally, uses start air to supply immediate oil pressure to the governor as an aid for quick<br />

starts.<br />

Starting Fuel Limiter<br />

A starting fuel limiter limits fuel flow to the engine during starting.<br />

Air Pressure Fuel Limiter<br />

A manifold air pressure bias fuel limiter for turbocharged engines limits engine fuel during acceleration as a function of manifold air<br />

pressure. It reduces smoke and improves efficiency during acceleration.<br />

Load Control<br />

A load control system provides a definite fuel or governor output position for each specific governor speed setting and in turn<br />

controls the engine power output. Used in many marine applications.<br />

Speed Setting Fuel Limiter<br />

A speed setting fuel limiter linkage limits the maximum fuel setting to the engine as a function of governor speed setting.<br />

Torque Limit Control<br />

Torque limit control limits fuel as a function of engine speed. Available in standard and vibration resistant designs.<br />

<strong>PGA</strong> <strong>Governor</strong> Schematic Diagram

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Specifications<br />

Woodward 36701 p.3<br />

Speed Setting<br />

<strong>Governor</strong> Drive<br />

Output<br />

Manual<br />

Pneumatic<br />

Speed Band<br />

Recommended Speed Range<br />

Power<br />

Direction of Rotation<br />

<strong>Governor</strong><br />

Linear<br />

Rotary<br />

Work Capacity<br />

Hydraulic System<br />

Sump Capacity<br />

Construction<br />

Operating Pressure<br />

Weight<br />

Case and Base<br />

References<br />

Publication Title<br />

36604 <strong>PGA</strong> <strong>Governor</strong> manual<br />

36010 PG <strong>Governor</strong> product specification<br />

36619 PG 200 <strong>Governor</strong> product specification<br />

36634 PG 500 <strong>Governor</strong> product specification<br />

Control knob on governor<br />

Available in direct or reverse type. 21 kPa (3 psi) minimum and 690 kPa<br />

(100 psi) maximum control air pressure. Ratio of high to low air control<br />

signal to be greater than 2.5 to 1 but less than 10 to 1. Typical ranges are<br />

21 to 103 kPa (3 to 15 psi) and 69 to 414 kPa (10 to 60 psi).<br />

Steady state speed control at 0.25% of rated under normal operating<br />

conditions.<br />

1.125"-18 serrated or keyed<br />

250 to 1000 drive rpm. Maximum speed range is 200 to 1600 rpm. Speeds<br />

in excess of 1000 rpm require single direction rotation. Oil coolers may be<br />

required.<br />

Drive power for different types of PG governors will vary depending upon<br />

speed, internal pump pressure, pump volumetric displacement, pump<br />

efficiency, and oil viscosity. Contact Woodard if further information is<br />

required.<br />

Fixed clockwise, fixed counterclockwise, or reversible<br />

Output can be located in most configurations<br />

Output of 1 inch (25 mm) maximum, push or pull to minimum fuel<br />

Output 30° maximum travel. Use 2/3 of the available governor travel<br />

between no load and full load.<br />

Rotary output available from 16 to 678 N•m (12 to 500 lb-ft). 271, 407, and<br />

678 N•m (200, 300, and 500 lb-ft) units have different governor outlines.<br />

Linear output available in 16 and 38 J (12 and 28 ft-lb) output only.<br />

about 1.4 L (1.5 qt). Uses SAE 10 to 50 oil, depending on operating<br />

temperature. 100 to 200 SUS recommended under normal operating<br />

conditions.<br />

690 kPa (100 psi) normal, 1379 kPa (200 psi) optional<br />

39 to 54 kg (85 to 120 lb) for standard <strong>PGA</strong> governors, depending on<br />

optional features.<br />

Cast iron, column is aluminum. Special pilot valve porting is available for<br />

difficult control conditions.

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Woodward 36701 p.4<br />

Outline Diagram of <strong>PGA</strong> <strong>Governor</strong> with Rotary Output<br />

(Do not use for construction)<br />

PO Box 1519, Fort Collins CO, USA 80522-1519<br />

1000 East Drake Road, Fort Collins CO 80525<br />

Tel.: +1 (970) 482-5811 • Fax: +1 (970) 498-3058<br />

www.woodward.com<br />

For more information contact:<br />

Distributors & Service<br />

Woodward has an international network of distributors and service facilities.<br />

For your nearest representative, call the Fort Collins plant or see the<br />

Worldwide Directory on our website.<br />

This document is distributed for informational purposes only. It is not to be construed as<br />

creating or becoming part of any Woodward contractual or warranty obligation unless<br />

expressly stated in a written sales contract.<br />

Copyright © Woodward 1974–2012, All Rights Reserved<br />

2012/8/Colorado