FUEL SYSTEMSYSTEMS OPERATIONTM 5-3805-263-14&P-2changes. The dashpot has cylinder (1), piston (2).dashpot spring (3), needle valve (5) and check valve(6). Piston (2) and spring seat (4) are fastened todashpot spring (3).When the governor spring and flyweight forces arebalanced and the engine speed is constant, valve (1)stops moving. Pressure oil from oil inlet (A) pushespiston (2) until oil passages (C and D) are opened.Oil now flows through oil passage (D) along valve (1)and out through oil outlet (B). With no oil pressureon the piston. the piston and fuel rack (5) stopmoving.When the governor moves in the FUEL OFF dir-ection, valve (1) moves to the right. The valve closesoil outlet (B) and opens oil passage (D). Pressure oilfrom oil inlet (A) is now on both sides of piston (2).The area of the piston is greater on the left side thanon the right side of the piston. The force of the oil isalso greater on the left side of the piston and movesthe piston and fuel rack (5) to the right.DashpotThe dashpot helps give the governor better speedcontrol when there are sudden speed and loadWhen the governor moves toward FUEL ON,spring seat (4) and piston (2) move to the right. Thismovement pulls oil from oil reservoir (7) throughcheck valve (6) and into cylinder (1).When the governor moves toward FUEL OFF,spring seat (4) and piston (2) move to the left. Thismovement pushes oil out of cylinder (1). throughneedle valve (5) and into oil reservoir (7).If the governor movement is slow. the oil gives norestriction to the movement of the piston and springseat. If the governor movement is fast in the FUELOFF direction, the needle valve gives a restriction tothe oil and the piston and spring seat will moveslowly.1-11
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
