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Refilling cylinder bottles at gas plants or gas stations requires appropriate expertise and training of operators, use of certified equipment, safe working procedures and a safe environment. If you are using the gas skid filling system, you can only refill cylinder bottles 80% full, this allows for expansion when gas turns from liquid to gas, and also if the temperature surrounding of the gas bottle gets hot.
Some cylinder regulators can be equipped with a safety device "excess flow valve". Mainly good for tank-to-tank method, to stop gas escaping in case of accidental detachment or breakage. However, adapter safety check valve is not intended to prevent overfilling of the gas cylinder valve. During tank-to-tank operation, after refilling a cylinder bottle, stopping LPG from coming back of the bottle, the regulator knob need to be turned off. If the user leaves the cylinder bottle outlet closed, but inlet valve open and you then removes the filling gun from the outlet valve, gas WILL sprout out in large quanlity, until you cut-off valve within the bottle itself to prevent LPG coming out. Replace adapters as recommended by the relevant regulations. You must comply with the regulations in force in the regulator's country to use. In the UK, there are general legal requirements related to gas bottle self-service. These regulations guild the use of refilling cylinder bottles at gas stations.
Lastly, refilling a part-empty cylinder bottle will require that the gas bottle be weighed before refilling commence, to ensure that the correct QUALITY of LPG is pumped in, so to prevent overfilling.