In a low pressure relief valve 4 for suction cups 1, the low pressure relief valve 4 comprises a special type of commercially available bicycle check valve in which the upper part 3 of the valve core pin emerges from the valve housing 4 in such a way that it can be moved (unsealed) by touch of the fingers for the purpose of low pressure relief, and it is fitted on the suction cup 1 in such a way that it closes automatically in the low pressure generation procedure (so that the air supply from the interior of the cup 1 toward the outside is interrupted). <IMAGE>
