Abstract
This chapter presents the various control components used in hydraulics; the purpose, construction, and operation of different valves such as pressure control valves, direction control valves, and flow control valves. The chapter also identifies the related graphical symbols in a hydraulic circuit and explains the different methods of valve actuation; compensated and non-compensated flow control; the purpose, design, and operation of servo valves, the concept of hydraulic fuses, the function and purpose of shock absorbers in hydraulics, and the operation of different types of temperature and pressure switches. One of the most important considerations in a hydraulic system is “control.” For any hydraulic system to function as required, a proper selection of control components is quite essential. Fluid power is primarily controlled with the help of control devices called valves. The selection of these control devices involves not only choosing the right type but also the size, actuating technique, and its remote control capability. The chapter reviews the working of various control devices in hydraulic systems such as control valves, servo valves, hydraulic fuses, temperature and pressure switches, and shock absorbers.
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