Latest advancements in refrigeration cylinder are the refrigeration charging cylinders. This refrigeration cylinder relates generally to the charging of refrigeration systems, and particularly to a refrigerant charging cylinder for use with conventional refrigeration systems. A refrigerant charging cylinder for refrigeration systems, comprising, in combination: means for drawing liquid refrigerant from the cylinder affected by the flow of saturated vapor flowing from the cylinder comprising; a) a tank containing a partially liquid and partially gaseous refrigerant and having an opening arranged spaced from a maximum liquid level of the refrigerant when the tank is arranged for charging a refrigeration system; b) a valve mounted on the tank and arranged partially in the tank opening, the valve including a housing an inlet port and an outlet port provided in the housing, a valve element disposed in the housing between the inlet port and the outlet port for selectively blocking and unblocking passage between the ports, and a saturated vapor pipe connected to the housing and surrounding the inlet port and arranged extending into the tank through the tank opening, the saturated vapor pipe terminating in the tank short of a maximum level of liquid refrigerant in the tank; and c) a liquid refrigerant pipe having a fluid nozzle thereon arranged in the saturated vapor pipe and extending into the liquid refrigerant in the tank, the liquid refrigerant being carried through the liquid refrigerant vapor pipe by a flow of gaseous refrigerant through the saturated vapor pipe and mixed with the gaseous refrigerant to form a saturated vapor. Liquid refrigerant pipe arranged in the saturated vapor pipe and extending into the liquid refrigerant in the tank, the liquid refrigerant being carried through the liquid refrigerant vapor pipe by a flow of gaseous refrigerant to form a saturated vapor, and the liquid refrigerant pipe includes a straight portion attached to the saturated vapor pipe and extending from the latter into the tank, and an offset portion forming a transition from the straight portion to a center of the saturated vapor pipe, and forming a throat within the saturated vapor pipe for increasing the suction on the liquid being drawn through the liquid refrigerant pipe by the flow of gas through the saturated vapor pipe.