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The PSG governor is a speed-droop governor for controlling speed of small diesel, gas, and gasoline engines or small steam and industrial gas turbines, isochronously or with droop.
The governor is used to control engines or turbines driving alternators, dc generators, pumps, or compressors. Pressure compensation provides the PSG governor with the necessary stability to control isochronously. Optimum adjustment is attained by the proper opening of the needle valve. The temperaturecompensated speeder spring minimizes speed drift caused by temperature change.
The governor has its own oil pump powered by the drive shaft, and requires oil from an external source (usually engine lube oil). An oil supply from a separate sump can be used.
Rotation of the drive shaft can be in either direction. The PSG governor can be fitted with check valves to allow drive rotation in both directions.
The manual speed-setting shaft can be on either or both sides of the case. The terminal shaft can be from either or both sides of the case.
The PSG governor provides hydraulic powered travel in the increase-fuel direction only. A return spring is used to provide travel in the decrease-fuel direction. The standard PSG cover provides for a vertical return spring in the governor. Governor models are available with horizontal return springs, or the governor can be fitted with a customer supplied external return spring.
Spring-driven and oil-damped ballheads are available to filter out torsional vibrations. A special temperature-compensated needle valve can be supplied to compensate for temperature effect on stability.
Droop may be set in some governors with a permanent movement of an adjustment inside the cover. Other governors are equipped with externally adjustable droop. External adjustment is available on either side of the case. Droop is adjustable from 0 to about 7 percent in all governors.
Electric speed-adjusting motors or pneumatic speed-setting is available for certain remote speed-setting applications. In most cases the speed-setting shaft does not extend from the case when other types of remote speed setting are used.
Product Specification 37010