The hydraulic valves are a part of the family of the control devices and regulators. They work on pressure, flow or referral of the fluid through the circuit. The valves
are also used for the return of the hydraulic fluid in the reservoir. The valves can control the
need to start or stop a hydraulic actuator. We
distinguish the valves into two types: continuous-action valves (proportional or servo) and valves
all or nothing.
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