A check valve comprising: a housing defining a pair of valve openings; a pair of flappers (30, 30a, 30b) pivotably mounted to a pin and such that they are configured to rotate relative to the housing between an open position in which they permit fluid flow through the valve openings and a closed position in which they prevent fluid flow through the valve openings; and a stop element configured to stop and hold the flappers in the open position, wherein a cavity is formed between the pair of flappers and the stop element when the flappers are in the open position, wherein the check valve further comprises: a pair of mounting posts for supporting the pin and the stop element, wherein each of the flappers comprises one or more contact surfaces configured to engage and contact a respective static, opposing portion of the stop element, the stop element comprising a pair of stop surfaces, each comprising respective contact areas configured to oppose and abut the contact surfaces of the flappers when the flappers contact the stop element in the open position, wherein at least one of the contact surfaces of the flappers and contact areas of the stop element are formed on one or more bumpers disposed on a respective one of the flappers and/or stop surfaces such that one or more openings are formed between each of the pair of flappers and the stop element adjacent to the one or more bumpers when the flappers contact the stop element in the open position to ensure fluid is able to flow therebetween, wherein each of the contact areas of the stop element are configured to be conformal to the contact surface of a respective flapper when the flappers contact the stop element in the open position, characterized in that the mounting posts and the stop element are formed of a single strip of material. a housing defining a pair of valve openings; a pair of flappers (30, 30a, 30b) pivotably mounted to a pin and such that they are configured to rotate relative to the housing between an open position in which they permit fluid flow through the valve openings and a closed position in which they prevent fluid flow through the valve openings; and a stop element configured to stop and hold the flappers in the open position, wherein a cavity is formed between the pair of flappers and the stop element when the flappers are in the open position, wherein the check valve further comprises: a pair of mounting posts for supporting the pin and the stop element, wherein each of the flappers comprises one or more contact surfaces configured to engage and contact a respective static, opposing portion of the stop element, the stop element comprising a pair of stop surfaces, each comprising respective contact areas configured to oppose and abut the contact surfaces of the flappers when the flappers contact the stop element in the open position, wherein at least one of the contact surfaces of the flappers and contact areas of the stop element are formed on one or more bumpers disposed on a respective one of the flappers and/or stop surfaces such that one or more openings are formed between each of the pair of flappers and the stop element adjacent to the one or more bumpers when the flappers contact the stop element in the open position to ensure fluid is able to flow therebetween, wherein each of the contact areas of the stop element are configured to be conformal to the contact surface of a respective flapper when the flappers contact the stop element in the open position, characterized in that the mounting posts and the stop element are formed of a single strip of material. a pair of mounting posts for supporting the pin and the stop element, wherein each of the flappers comprises one or more contact surfaces configured to engage and contact a respective static, opposing portion of the stop element, the stop element comprising a pair of stop surfaces, each comprising respective contact areas configured to oppose and abut the contact surfaces of the flappers when the flappers contact the stop element in the open position, wherein at least one of the contact surfaces of the flappers and contact areas of the stop element are formed on one or more bumpers disposed on a respective one of the flappers and/or stop surfaces such that one or more openings are formed between each of the pair of flappers and the stop element adjacent to the one or more bumpers when the flappers contact the stop element in the open position to ensure fluid is able to flow therebetween, wherein each of the contact areas of the stop element are configured to be conformal to the contact surface of a respective flapper when the flappers contact the stop element in the open position, characterized in that the mounting posts and the stop element are formed of a single strip of material.