Vogele Basic Training Hydraulics & Electrics
Vogele Basic Training Hydraulics & Electrics
Vogele Basic Training Hydraulics & Electrics
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H.8.0 Closed circuit<br />
The hydraulic pump is fed with hydraulic fluid returning directly from the actuator (hydraulic motor).<br />
The hydraulic fluid is under low pressure of roughly 10 to 30 bar and is raised to a higher pressure level<br />
(high pressure) by the hydraulic pump before being fed back to the actuator again.<br />
The advantages of this process are high speeds and filtering at a low pressure of just 10 to 20% of the volume<br />
of the primary pump.<br />
The circuit has high pressure and low pressure sides, which change with the direction of load.<br />
The high pressure side is protected by pressure control valves, which relieve the pressure towards the<br />
low pressure side.<br />
The medium remains in the circuit.<br />
Only the leakage at the hydraulic pump and hydraulic motor (depending on operating data) has to be replaced.<br />
This is realized by a (usually) directly flange-connected auxiliary pump that permanently feeds a sufficient fluid<br />
volume ( feed volume ) from a tank to the low pressure side via a non-return valve.<br />
The unneeded volume flow of the feed pump working in the open circuit is returned to the tank via a feed<br />
pressure control valve.<br />
Volume flow variable<br />
Pump,<br />
variable<br />
Motor,<br />
variable