VOLUME DISPLACEMENT Start with a conventional actuator as in "FIGURE 1". Connect a pressurized fluid source to the valve attached to the fluid port of the actuator in "FIGURE 2". Open the valve to fill the actuator and close the valve when a 20 in³ volume change occurs. The shaft drives out exerting a force dependent on the pressure of the fluid. Disconnect the fluid supply and connect a balloon to the valve attached to the fluid port of the actuator as in "FIGURE 3". Re-open the valve. Push on the shaft, forcing it back to its position before you first added the fluid supply as in "FIGURE 4". Identical volume change occurs, whether filling an actuator or emptying an actuator, for equal linear travel. 13.250 FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4 VALVE VALVE VALVE VALVE FLUID SOURCE VOLUME CHANGE = 20 IN³ VOLUME CHANGE 20 IN³ VOLUME CHANGE 20 IN³ BALLOON BALLOON PUSH
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