Connecting valve and combustion appliance

A combustion appliance, comprising a connecting valve, wherein the connecting valve comprises:

• a valve body, provided with a gas output channel, a first input port, a second input port, and a circulation chamber, wherein the gas output channel is in communication with the circulation chamber through a connecting opening, and the first input port and the second input port are located at two ends of the circulation chamber along an axial direction of the valve body;
• a first communicating structure, comprising a connecting assembly and a sealing assembly, wherein the connecting assembly, configured to be connected with a first gas cylinder, is provided at the first input port of the valve body, the sealing assembly, configured to seal the first input port, is slidably provided with respect to a chamber wall of the circulation chamber and the connecting assembly, the first input port is capable of being opened by a gas pressure of the gas in the first gas cylinder, so that a first gas is delivered into the gas output channel;
• and
• a second communicating structure, mounted at the second input port, configured to connect a second gas cylinder, the second input port is capable of being opened by the gas pressure of the gas in the second gas cylinder, so that a second gas is delivered into the gas output channel.