Control valve for air cushion bed

A control valve for an air cushion bed, comprising a first main body, a membrane plate, a second main body and a sensor, and characterized by:

• the first main body having a first room therein, the first main body comprising a first pipe, the first pipe communicating with the first air chamber;
• the second main body having a second room corresponding to the first room of the first main body, the sensor being disposed in the second room;
• the membrane plate located between the first main body and the second main body;
• and
• the sensor having a trigger portion, the trigger portion being exposed out of the second room and facing the membrane plate,
• wherein the first main body has the first room, a first air chamber, a second air chamber and a fourth air chamber which communicate with each other, the first main body comprising the first pipe and a second pipe, the first pipe communicating with the first air chamber, the second pipe communicating with the second air chamber;
• the second main body having the second room corresponding to the first room of the first main body, the sensor being disposed in the second room, the second main body comprising a depressurization pipe, the depressurization unit being disposed in the depressurization pipe, the depressurization pipe communicating with an air pipe;
• the membrane plate being located between the first main body and the second main body, the membrane plate comprising a main membrane portion and an extension portion, the main membrane portion being clamped between the first main body and the second main body, the extension portion having a through hole corresponding in position to the fourth air chamber.