The present invention provides a space-saving rotary structure for relaying signals which can relay a large number of signal lines without causing a disconnection of the signal lines. The main body surrounds the periphery of the cover, and the main body and the cover form a continuous surface. The processing system has a memory for storing predetermined conditions and a control element for analyzing received sensor data by comparing the received sensor data to stored predetermined conditions. After being subjected to the fractionation process, polyol polymers that form hydrogels in aqueous solution exhibited higher viscosities and a liquid to gel transition over a narrower temperature range than the unfractionated polyol polymers. The flavor composition is concentrated such that it can separate into aqueous and oil phase under usual transport conditions and is provided in a unitized quantity corresponding to a batch supply for dilution to the desired beverage or an integer fraction of such a single batch supply. The stopper member is made of an elastic member which is elastically deformed only in the radial direction and is hardly deformed in the axial direction.