. When load on actuator is small and pump discharge pressure is highWhen the load is large and pump discharge pressures Pal and Pa2 are high, the force pushing piston (2) to the left becomes larger and piston (2) moves to the position shovvn in the diagram above. When this happens, as shovvn in the diagram above, with the pressurized oil flowing from port c to the LS valve, part of the pressurized oil from port b flows out to port d and becomes approxi- mately 2/5 main pump pressure Pa1.When port h and port e of the LS valve are connected (see 1. LS valve), the pressure from port f enters the large piston diameter end of servo piston (9), and servo piston (9) stops.If main pump pressures Pa1 and Pa2 increase íurther and piston (2) moves further to the left, main pump pressure Pa1 flows to port c and acts to make the discharge amount the iminimuim. When piston (9) moves to the left, piston (5) is moved to the right by cam (7) and lever (6). For this reason, springs (3) and (4) are compressed and push back pis- ton (2). Because of this force, piston (2) cuts off the connection from port b to port c, and port c and port d are connected. As a result, the pressure at port c (= f) drops, and piston (9) stops moving to the left. The position in which piston (9) stops when this happens is turther to the left than the position when main pump pressures Pa1 and Pa2 are low.
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