A valve for use in a fuel supply system of a multi-fuel gas turbine, comprising: a valve body; at least a first delivery pipe configured to be supplied with liquid fuel, a second delivery pipe configured to be supplied with a drain liquid and a third fluid delivery pipe configured to be supplied with a drain gas, the at least first, second and third delivery pipes being positioned on the valve body; at least one outlet pipe (20, 50, 52, 54, 56) positioned on the valve body and configured to be connected to one or more combustion chambers of the gas turbine; and a spherical shutter inside the valve body rotatable about a transverse axis relative to the delivery pipes (14, 16, 18) and the at least one outlet pipe and comprising a first (26, 60) and a second distribution channel (28, 62) formed on the shutter such that: in a first position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the first delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), in a second position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the second delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), and in a third position of the shutter, the second distribution channel (28, 62) is configured to allow fluid communication between the third delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), characterized in that the first and the second distribution channel (26, 28; 60, 62) of the shutter extend in separate planes to each other in order to avoid fluid communication between the said channels. a valve body; at least a first delivery pipe configured to be supplied with liquid fuel, a second delivery pipe configured to be supplied with a drain liquid and a third fluid delivery pipe configured to be supplied with a drain gas, the at least first, second and third delivery pipes being positioned on the valve body; at least one outlet pipe (20, 50, 52, 54, 56) positioned on the valve body and configured to be connected to one or more combustion chambers of the gas turbine; and a spherical shutter inside the valve body rotatable about a transverse axis relative to the delivery pipes (14, 16, 18) and the at least one outlet pipe and comprising a first (26, 60) and a second distribution channel (28, 62) formed on the shutter such that: in a first position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the first delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), in a second position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the second delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), and in a third position of the shutter, the second distribution channel (28, 62) is configured to allow fluid communication between the third delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), characterized in that the first and the second distribution channel (26, 28; 60, 62) of the shutter extend in separate planes to each other in order to avoid fluid communication between the said channels. in a first position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the first delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), in a second position of the shutter, the first distribution channel (26, 60) is configured to allow fluid communication between the second delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), and in a third position of the shutter, the second distribution channel (28, 62) is configured to allow fluid communication between the third delivery pipe and the at least one outlet pipe (20, 50, 52, 54, 56), characterized in that the first and the second distribution channel (26, 28; 60, 62) of the shutter extend in separate planes to each other in order to avoid fluid communication between the said channels.