🔍 Key Concepts

• Study how the buffer piston, buffer spring, and compensation needle valve are connected between the pilot valve and the power piston in the governor diagram • Review what engine hunting (unstable oscillation of speed) is and how governors are designed to smooth or damp rapid movements • Compare which governor parts actually sense speed (flyweights) versus which parts only modify or delay the governor’s response

💭 Think About

• In the illustration, trace the oil flow from the pilot valve to the power piston. How does the compensation system change the speed or smoothness of that movement? • Which component in the governor directly detects changes in engine rpm, and is that the same component group labeled as the compensation system? • If a governor reacted too quickly and overshot the desired speed on every change in load, what kind of behavior would you see, and which choice best describes a system designed to correct that?

✅ Before You Answer

• Verify which part of the governor is labeled as sensing actual engine speed (look near the flyweights and speeder spring) • Check whether the compensation system has any mechanical or hydraulic link to the bridge speed setting or maximum speed stop • Ask whether the compensation system’s main effect is to measure speed, to limit maximum speed, or to stabilize/dampen the governor’s response to speed changes