Is the source of energy that acts against the piston, forcing the fluid into the hydraulic system to drive an actuator. The pressure generated by this type of accumulator dependes on the size and preloading of the spring. In addition, the pressure exerted on small volume the fluid is not a constant. The spring-loaded accumulator typically delivers a relatively systems. This type of accumulator should not de used for applications requiring high cycle rates decause the spring will fatigue, resulting in an inoperative accumulator.