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Automatic Control Valves are valves that work with hydraulic actuators (also known as hydraulic pilots). The hydraulic actuators will respond to changes of pressure or flow and will open/close the valve. Automatic Control Valves do not require an external power source, meaning that the fluid pressure is enough for opening and closing the valve. Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, altitude valves, and relief valves. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, man power), it is done automatically, hence its name. There are different types of automatic control valves in hydraulic circuits that perform their functions "behind the scenes," where you are not even aware of their presence. In fact, as you will see, the operator really has no control over their functions during a machine's operation. Most automatic control valves are adjustable by a service technician, but not by the operator. Each type of valve has a specific purpose, so each valve will show different symptoms when not functioning properly.

Four of the most common automatic control valves found on the average machine are Priority valve, Pressure reducing valve, Pressure sequencing valve, and Pressure reduction valve.

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