Abstract: The invention contemplates a check-valve construction wherein a plurality of at least three generally triangular valve members are independently hinged to the respective base lines of a pyramidal seat configuration, the base lines being in a plane which essentially establishes the upstream end of the valve, and the apex of the pyramid (and, thus, the apex of each valve-member triangle) essentially establishes the downstream end of the valve.

Abstract: The invention contemplates a particular body construction and assembly for a check valve or the like whereby the entire valve assembly may be readily installed as a unit within the bore of standard pipe or conduit, or a standard fitting therefor. A single circumferentially extending radially inwardly open groove in the bore of the pipe, conduit or fitting, faces a corresponding radially outwardly open groove in the valve body, and stiffly compliant circumferentially extensive retainer element such as a wire of suitable gage substantially fills these grooves to retain the inserted valve in place. The retainer element is adapted for ready removability, to enable servicing or removal of the inserted valve, and the valve body is so externally characterized as to unambiguously assure valve installation in the correct direction of desired flow.

Abstract: The invention contemplates a check-valve construction wherein two generally semi-circular valve members are hinged to a diametrically extending seat post which divides the bore of the check-valve body into two valve-seat openings, for separate check-valve action with the respective seat openings. In the form described a single hinge connection of both valve members is made to a downstream offset carried at the mid-point of the seat post.