Abstract: The invention relates to a check valve of the type that comprises two opposing D-shaped end covers (2). The main body (1) of said valve comprises two supporting elements (1.3) which are used to house two wedged prismatic supports (6). Two shafts are fixed between the two prismatic supports by means of non-through holes (6.2). One (3) of said shafts serves as a hinge for the end covers (2) while the other shaft (4) restricts the opening of said end covers. In this way, holes which pass through the valve body (1) and which could cause leaks are not necessary and the entire internal surface of the valve is protected by means of vulcanisation (7).