Which of the following statements about dither is true?

Dither is a technique used in hydraulic systems to improve the control of valves. The statement that dither refers to the rapid movement of the spool is accurate. In practical terms, dither involves the intentional, quick oscillation or movement of the valve spool. This rapid movement helps prevent the spool from sticking, which can occur due to friction or wear, ensuring that the valve remains responsive to control signals.

Dither is particularly important in systems where precise control is necessary, as the movement facilitates better modulation and responsiveness of fluid flow through the valve. By maintaining a certain degree of motion, dither helps to ensure that the valve functions effectively and efficiently within its intended application. Understanding this mechanism is vital for anyone involved in fluid power system design and maintenance, particularly at the millwright level.