Suction cup

A suction cup, including:

• a suction member, including a seat body, a control member which is movably disposed on the seat body, a first flow channel and a second flow channel, the seat body including a seat portion and a cup portion which is elastically deformable and disposed on the seat portion, the cup portion being configured to contact a surface, the seat body having a first gas chamber, a second gas chamber being defined between the control member and the seat body, the first flow channel being communicated with the first gas chamber and the second gas chamber, the control member having the second flow channel;
• a first check valve, disposed within the first flow channel and openably closing the first flow channel, the first check valve allowing fluid to flow from the first gas chamber to the second gas chamber;
• a second check valve, disposed within the second flow channel and openably closing the second flow channel, the second check valve allowing fluid to flow from the second gas chamber to an outside of the suction cup;
• and
• a cap, disposed on the control member and covering the second check valve.