If a hydraulic system's piston area remains constant and system pressure increases, what happens to actuator force?

• A. Force increases proportionally to pressure
• B. Force remains constant
• C. Force decreases
• D. Force depends on temperature

Answer: (A)

In a hydraulic system, the actuator force comes from the fluid pressure acting on the piston area: F = P × A. If the piston area stays the same and the system pressure increases, the force increases directly in proportion to the pressure. So doubling the pressure doubles the force, tripling the pressure triples the force, and so on. For example, with a fixed piston area, if pressure rises from 100 psi to 150 psi, the force goes from 100 × A to 150 × A (a 50% increase). Temperature isn’t the factor here; the direct relationship is pressure times area.