A refuelling device for supplying liquefied gases, comprising a feed system adapted to place a plurality of refuelling reservoirs in fluidic through connection with at least one tank ; said feed system comprises - withdrawal ducts , each of which is adapted to withdraw said liquefied gas from one of said reservoirs ; - an inlet duct for introducing said liquefied gas into said tank ; - a collection manifold adapted to convey said liquefied gas from said withdrawal ducts , and therefore from said reservoirs , into said inlet duct ; - at least one pump adapted to move said liquefied gas in said feed system , thus allowing said liquefied gas to be simultaneously withdrawn from each of said reservoirs ; - for each pump , a pressure gauge adapted to measure the inlet pressure of said liquefied gas entering said pump and a pressure meter adapted to measure the outlet pressure of said liquefied gas exiting said pump ; and - a regulating valve for adjusting the flow in said inlet duct according to the difference between said inlet pressure and said outlet pressure; and comprising a pressurization system comprising a connecting member adapted to place the reservoirs in reciprocal fluidic through connection so as to place said reservoirs under the same pressure; and wherein said pressurization system is adapted to place said tank in fluidic through connection with each of said tanks , thus allowing the boil-off of said liquefied gas in said tank to be introduced into each of said reservoirs, thereby raising the pressure of said reservoirs . said feed system comprises - withdrawal ducts , each of which is adapted to withdraw said liquefied gas from one of said reservoirs ; - an inlet duct for introducing said liquefied gas into said tank ; - a collection manifold adapted to convey said liquefied gas from said withdrawal ducts , and therefore from said reservoirs , into said inlet duct ; - at least one pump adapted to move said liquefied gas in said feed system , thus allowing said liquefied gas to be simultaneously withdrawn from each of said reservoirs ; - for each pump , a pressure gauge adapted to measure the inlet pressure of said liquefied gas entering said pump and a pressure meter adapted to measure the outlet pressure of said liquefied gas exiting said pump ; and - a regulating valve for adjusting the flow in said inlet duct according to the difference between said inlet pressure and said outlet pressure; and comprising a pressurization system comprising a connecting member adapted to place the reservoirs in reciprocal fluidic through connection so as to place said reservoirs under the same pressure; and - withdrawal ducts , each of which is adapted to withdraw said liquefied gas from one of said reservoirs ; - an inlet duct for introducing said liquefied gas into said tank ; - a collection manifold adapted to convey said liquefied gas from said withdrawal ducts , and therefore from said reservoirs , into said inlet duct ; - at least one pump adapted to move said liquefied gas in said feed system , thus allowing said liquefied gas to be simultaneously withdrawn from each of said reservoirs ; - for each pump , a pressure gauge adapted to measure the inlet pressure of said liquefied gas entering said pump and a pressure meter adapted to measure the outlet pressure of said liquefied gas exiting said pump ; and - a regulating valve for adjusting the flow in said inlet duct according to the difference between said inlet pressure and said outlet pressure; and comprising a pressurization system comprising a connecting member adapted to place the reservoirs in reciprocal fluidic through connection so as to place said reservoirs under the same pressure; and wherein said pressurization system is adapted to place said tank in fluidic through connection with each of said tanks , thus allowing the boil-off of said liquefied gas in said tank to be introduced into each of said reservoirs, thereby raising the pressure of said reservoirs . <EOS>