An outlet valve, comprising: a valve body, the valve body comprising: a water inlet cavity; a water outlet cavity; a water storage cavity; a drain waterway; a first waterway coupled to the drain waterway through a first drain opening, the first waterway comprising: a first plug coupled to an output end of a solenoid valve, the first plug configured for controlling opening and closing the first drain opening; a second waterway coupled to the drain waterway through a second drain opening, wherein the second waterway is communicated with the water storage cavity through the first waterway, the second waterway comprising: a second plug coupled to a manual operating member, the second plug configured for controlling opening and closing the second drain opening; and a waterproof membrane located at least partially in the water storage cavity, the waterproof membrane configured to hermetically separate the water outlet cavity from the water storage cavity; the solenoid valve coupled to the valve body; and the manual operating member coupled to the valve body; wherein the first plug is movable in a first direction to close the first drain opening and the second plug is movable in a second direction to close the second drain opening, characterized in that the second plug is biased in a closed position by a second elastic member connected to a connecting sleeve included in the manual operating member, and in that both the first and second directions extend along a common axis, the first direction being a direction opposite the second direction. a valve body, the valve body comprising: a water inlet cavity; a water outlet cavity; a water storage cavity; a drain waterway; a first waterway coupled to the drain waterway through a first drain opening, the first waterway comprising: a first plug coupled to an output end of a solenoid valve, the first plug configured for controlling opening and closing the first drain opening; a second waterway coupled to the drain waterway through a second drain opening, wherein the second waterway is communicated with the water storage cavity through the first waterway, the second waterway comprising: a second plug coupled to a manual operating member, the second plug configured for controlling opening and closing the second drain opening; and a waterproof membrane located at least partially in the water storage cavity, the waterproof membrane configured to hermetically separate the water outlet cavity from the water storage cavity; a water inlet cavity; a water outlet cavity; a water storage cavity; a drain waterway; a first waterway coupled to the drain waterway through a first drain opening, the first waterway comprising: a first plug coupled to an output end of a solenoid valve, the first plug configured for controlling opening and closing the first drain opening; a second waterway coupled to the drain waterway through a second drain opening, wherein the second waterway is communicated with the water storage cavity through the first waterway, the second waterway comprising: a second plug coupled to a manual operating member, the second plug configured for controlling opening and closing the second drain opening; and a waterproof membrane located at least partially in the water storage cavity, the waterproof membrane configured to hermetically separate the water outlet cavity from the water storage cavity; the solenoid valve coupled to the valve body; and the manual operating member coupled to the valve body; wherein the first plug is movable in a first direction to close the first drain opening and the second plug is movable in a second direction to close the second drain opening, the second plug is biased in a closed position by a second elastic member connected to a connecting sleeve included in the manual operating member, and in that both the first and second directions extend along a common axis, the first direction being a direction opposite the second direction.