A gas vent valve assembly may be attached or incorporated to a disposable fluid transfer set used with a fluid warmer to administer an infusate to a patient. The gas vent valve assembly has a housing having a fluid inlet, a gas outlet and a fluid outlet. The gas outlet is located at the top of the housing while the fluid outlet is located at the bottom of the housing. The fluid inlet is located at a side lower portion of the housing. Inside the housing is an actuator float that has an upper seal and a lower seal. The dimension of the float relative to the chamber of the housing is such that the float is freely movable within the housing to an upper position whereby its upper seal closes the gas outlet while the fluid outlet is opened, and to a lower position whereby its lower seal closes the fluid outlet and the gas outlet is opened. The movement of the float is dependent on the respective amounts of air and fluid in the housing, and the buoyancy of the float relative to the fluid in the housing. When a predetermined volume of air gets inside the housing, the float sinks to its lower position to close the fluid outlet and open the gas outlet, so that the air inside the housing is vented to atmosphere while fluid is prevented from being output to the patient. When the amount of gas in the chamber has been reduced to a given volume, with a corresponding increase in the amount of fluid in the housing, the float is raised to open the fluid outlet, thereby enabling the fluid inside the housing to be output to the patient. At that time, the gas outlet is shut to prevent any reverse inflow of air into the housing.【課題】生理又は細胞液を患者に供給するために使用される点滴管セットに閉じ込められたガス又は空気を除去する。【解決手段】通気弁組立品は、使い捨ての液移送セットに取り付けてもよいし、それに組み込んでもよい。液移送セットは、液加温器とともに用いられ、点滴液を患者に与える。通気弁組立品は、液入口、ガス出口、および液出口を有するハウジングを備える。ガス出口はハウジングの上部に位置し、また液出口はハウジングの底部に位置する。液入口は、ハウジングの側底部に位置する。上方密封部と下方密封部を有するアクチュエータ浮きが、ハウジング内にある。ハウジング内でアクチュエータ浮きは、上方位置と下方位置に移動自由である。アクチュエータ浮きが上方位置にある時、上方密封部がガス出口を閉じる一方、液出口は開かれている。アクチュエータ浮きが下方位置にある時、
