Test cylinder of valve assembly and connection structure for the same

A test cylinder of a valve assembly being mounted a body of the valve assembly, the body including a holder, and the holder comprising an accommodation chamber, a bottom fence formed in the accommodation chamber, and a cold-water inlet and a hot-water inlet which are defined on the bottom fence and respectively communicate with a cold-water inflow pipe and a hot-water inflow pipe of the body;

• the accommodation chamber having a first mixing-water outlet and a second mixing-water outlet which are arranged on a bottom of the accommodation chamber and individually communicate with a first outflow pipe and a second outflow pipe;
• the test cylinder including a peripheral fence, a first orifice formed on a first segment of the peripheral fence, and an edge fence closing a second segment of the peripheral fence;
• a first cavity defined between the peripheral fence and the edge fence and communicating with the first orifice, wherein the peripheral fence has at least one second orifice formed thereon proximate to the first orifice, a second cavity defined between an external surround portion of the first segment and an internal surround portion of the accommodation chamber and communicating with the at least one second orifice, the first mixing-water outlet, and the second mixing-water outlet;
• wherein in a first fixing direction, the first segment of the test cylinder is engaged in the accommodation chamber, such that the accommodation chamber is closed, the cold-water inlet and the hot-water inlet communicate with each other by way of the first orifice and the first cavity, and the first mixing-water outlet and the second mixing-water outlet are in communication with each other by using the at least one second orifice and the second cavity so that the cold-water inflow pipe, the hot-water inflow pipe, the first outflow pipe, and the second outflow pipe form a first closed pipe system;
• the edge fence has a closing portion extending from an outer wall thereof and has a conduit defined in the edge fence;
• in a second fixing direction, the second segment of the test cylinder is engaged in the accommodation chamber or the closing portion matingly engages one of the cold-water inlet and the hot-water inlet, hence the cold-water inlet or the hot-water inlet does not communicate with the accommodation chamber of the body so that one of the cold-water inflow pipe and the hot-water inflow pipe forms a second closed pipe system;
• the other of the cold-water inlet and the hot-water inlet communicates with the first mixing-water outlet and the second mixing-water outlet by way of the conduit and the second cavity so that the other of the cold-water inflow pipe and the hot-water inflow pipe forms a third closed pipe system by using the body, the first outflow pipe, and the second outflow pipe.