A heating and humidifying device and a heating and humidifying method. The heating and humidifying device comprises a housing (1), a water tank atomizing set, a steam generator, a heating breathing pipeline, and a controller. A tank body (11) of the water tank atomizing set is buckled with a plurality of elastic pieces (5) in the housing by means of buckling strips on the outer side wall of the water tank atomizing set; the steam generator is snap fit with grooves (8) on the two sides of the housing (1) by means of the buckling pieces (29) on the two sides; a mist outlet (13) on the tank body (11) of the water tank atomizing set is connected to a connector (38) of the steam generator; a gas outlet (28) on the steam generator is connected to the heating breathing pipeline. The heating and humidifying method comprises the steps of: (1) water injecting atomization; (2) water mist gasifying; and (3) heat insulating and gas exhausting.

A float-controlled valve array including a valve assembly having a conduit, a valve seat formation through which the conduit passes, and a valve body formation which is movable between a closed position in which the conduit is closed and an open position in which a flow through the conduit is possible; the valve array further including a first and a second float body having a first and a second buoyancy volume portion, respectively, wherein the first and the second float bodies are articulated pivotally on a first and a second joint, respectively, so that during specified normal operation, each float body is movable along a buoyancy axis between a lowered position and a buoyant position, and wherein the first float body and the second float body are each coupled to the valve body formation in such a way that the valve body formation is in the closed position when at least one of the float bodies is in the buoyant position, and is in the open position when both float bodies are in the lowered position; the buoyancy volume portions of the two float bodies are mutually spaced apart at a distance orthogonal to the buoyancy axis in the lowered position, wherein at least one joint is located in a body spacing region between the two buoyancy volume portions.