The PG-PL Governor is widely used for
controlling speed for all types of diesel or gas
engines and steam turbines, driving pumps
and compressors.
Standard Features
An internal oil pump, relief-valve, and
accumulator system controls governor
operating pressure. A self-contained sump
stores oil and reduces contamination from
outside sources.
Oil flow to and from the governor cylinder
assembly is controlled by a centrifugal
flyweight-head and pilot-valve assembly. A
power cylinder (servomotor) positions the fuel
racks, fuel valve, or steam valve of the engine
or turbine.
A pneumatic (direct or reverse) operated
bellows-type mechanism sets governor speed.
A knob on the governor provides a means of
manual speed adjustment. Governor stability
is provided by an adjustable needle valve and
spring-loaded buffer compensation system.
Optional Features
An oil cooler is recommended when governor
oil temperature exceeds 99 °C (210 °F) or
governor drive shaft speed exceeds 1200 rpm
on diesel or gas engines, or 1100 rpm on steam turbines.
Air, oil, or water shutdown devices, either high or low pressure, are available for
engine protection. An energize or de-energize solenoid shutdown device is also
available.
For quick starts, a booster servomotor is available to supply immediate oil pressure
to the governor. This conserves engine starting air.
Preloaded buffer springs are available for governors used on gas engines and on
some engines driving reciprocating pumps.
Various base and power cylinder assemblies are available to conform to engine or
turbine manufacturer’s specifications.
Power servos may be mounted integrally on the governor with the terminal shaft in
either the 3, 6, 9, or 12 o’clock positions. Power servos also may be mounted
remotely from the governor. However, rotary power servos mount vertically only.
