A check valve for use in an engine system comprising: a housing defining an internal cavity having a first port and a second port both in fluid communication therewith, and having a first seat defined by a first elastomeric V-ring seal and a second seat , a second elastomeric V-ring seal disposed radially inward of the first elastomeric V-ring seal ; and a check valve plate within the internal cavity , wherein the check valve plate is translatable, in response to pressure differentials, between a closed position against the first seat and an open position against the second seat within the internal cavity of the housing ; wherein the first elastomeric V-ring seal is positioned to surround an opening defined by the housing for fluid communication between the internal cavity and the first port ; wherein the first elastomeric V-ring seal includes a body having an interference fit to an annular channel defined by the housing and a lip extending from the body outwardly away from said opening defined by the housing , said lip defining with the body a generally V-shaped void , viewed in cross-section, opening in a direction away from and generally perpendicular to a flow through the first elastomeric V-ring seal into the internal cavity ; and wherein the second elastomeric V-ring seal includes a body having an interference fit to a further annular channel defined by the housing and a lip extending from the body in a direction opposite to that of the lip of the first elastomeric V-ring seal , said lip defining with the body a generally V-shaped void , viewed in cross-section, opening in a direction opposite to that of the V-shaped void of the first elastomeric V-ring seal . a housing defining an internal cavity having a first port and a second port both in fluid communication therewith, and having a first seat defined by a first elastomeric V-ring seal and a second seat , a second elastomeric V-ring seal disposed radially inward of the first elastomeric V-ring seal ; and a check valve plate within the internal cavity , wherein the check valve plate is translatable, in response to pressure differentials, between a closed position against the first seat and an open position against the second seat within the internal cavity of the housing ; wherein the first elastomeric V-ring seal is positioned to surround an opening defined by the housing for fluid communication between the internal cavity and the first port ; wherein the first elastomeric V-ring seal includes a body having an interference fit to an annular channel defined by the housing and a lip extending from the body outwardly away from said opening defined by the housing , said lip defining with the body a generally V-shaped void , viewed in cross-section, opening in a direction away from and generally perpendicular to a flow through the first elastomeric V-ring seal into the internal cavity ; and wherein the second elastomeric V-ring seal includes a body having an interference fit to a further annular channel defined by the housing and a lip extending from the body in a direction opposite to that of the lip of the first elastomeric V-ring seal , said lip defining with the body a generally V-shaped void , viewed in cross-section, opening in a direction opposite to that of the V-shaped void of the first elastomeric V-ring seal . <EOS>