Characteristic:
Auto Limiter Shut-Off Valve is installed in the pipeline of underground oil tank, connecting with oil unloading port. When the oil level inside the oil tank reaches less than 200 millimeter to the roof, the main valve will shut off to prevent overfilling. 
After that, the fuel inside the unloading hose can only be discharged though by-pass valve, the flow rate ranges from 12L/min to 20L/min, until the oil level rises to less than 76 millimeter to the oil tank roof.