1. Directional control valves (DCVs):
They determine the path through which a fluid transverses a given
circuit.
Pressure control valves:
They protect the system against overpressure, which may occur due to a
sudden surge as valves open or close or due to an increase in fluid demand.
2. Flow control valves:
Shock absorbers are hydraulic devices designed to smooth out pressure surges
and to dampen hydraulic shock.
In addition, the fluid flow rate must be controlled in various lines of a hydraulic circuit. For example, the
control of actuator speeds can be accomplished through use of flow control valves. Non-compensated
flow control valves are used where precise speed control is not required because the flow rate varies with
pressure drop across a flow control valve. It is important to know the primary function and operation of
various types of control components not only for good functioning of a system, but also for discovering
innovative methods to improve the fluid power system for a given application.
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