FIELD: engines and pumps.SUBSTANCE: non-return valve includes two non-return valves with the corresponding cavities, partition (16) located between those cavities and having connection holes (23, 33), elastic film-type housings (21, 31), elastic element (22, 32) having wall (22c, 32c) enveloping connection hole (23, 33), and another wall (22c, 32c) enveloping the other connection hole (23, 33) in order to retain the above film-type housings (21, 31), and clamping element (17) for clamping of elastic element (22, 32) with partition (16). Surface (22a, 32a) of elastic element (22, 32) is tightly connected to surface (16a) on the side of the second cavity of partition (16). Rear surface (22b, 32b) on opposite side of surface (22a, 32a) is tightly connected to clamping element (17). Clamping element (17) has section (24, 34) protruding on the side of partition (16), which is inserted into cavity (25, 35) enveloped with wall (22c, 32c) so that the deformation due to distortion of elastic film-type housing (21, 31) can be eliminated. Elastic film-type housings (21, 31) and elastic element (22, 32) are made as a complete unit. There is diaphragm pump using the non-return valve and sphygmomanometer using such diaphragm pump.EFFECT: improving operating reliability of non-return valve due to providing the gas passage from inner cavity of diaphragm pump to pump chamber and preventing the gas passage in backward direction.7 cl, 12 dwgГруппа изобретений относится к медицинскому оборудованию и предназначена для измерения кровяного давления человека. Устройство обратного клапана включает в себя два обратных клапана с соответствующими полостями, перегородку (16), расположенную между этими полостями и имеющую соединительные отверстия (23, 33), упругие пленочные корпуса (21, 31), упругий элемент (22, 32), имеющий стенку (22с, 32с), окружающую соединительное отверстие (23, 33), и другую стенку (22с, 32с), окружающую другое соединительное отверстие (23, 33) для удержания упомянутых пле
