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Automatic are 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 . Automatic do not require an external power source, meaning that the fluid pressure is enough for opening and closing the . Automatic include: pressure reducing , flow , back-pressure sustaining , altitude , and relief . An altitude s the level of a tank. The altitude 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 requires no external power source (electric, pneumatic, man power), it is done automatically, hence its name. There are different types of automatic 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 over their functions during a machine's operation. Most automatic are adjustable by a service technician, but not by the operator. Each type of has a specific purpose, so each will show different symptoms when not functioning properly.
Four of the most common automatic found on the average machine are Priority , Pressure reducing , Pressure sequencing , and Pressure reduction .
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