Ring disc nozzle check valve 100 allows fluid flow in one direction and can act as a relief valve and comprises valve body 1 which defines valve body fluid passageways 20,22 therethrough; primary seat 2 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30; primary disc 4 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30 and in communication with primary seat 2; secondary disc 5 nested within valve body fluid passageways 20,22, where secondary disc 5 defines secondary seat 3 at a peripheral edge of primary disc 4; diffuser 8 disposed in the valve body fluid passageway 20 proximate fluid outlets 32a,32b; primary spring 10 disposed in valve body fluid passageways 20,22 and in communication with diffuser 8 and primary disc 4, where primary spring 10 is adapted to urge primary disc 4 to a closed position; primary shaft 6 disposed within valve body fluid passageway 22 intermediate diffuser 8 and secondary disc 5, where primary shaft 6 is in communication with diffuser 8 and adapted to support and guide primary disc 4 and allow fluid flow through primary shaft 6; secondary shaft 7 disposed within valve body fluid passageway 22 and configured to support and guide secondary disc 5; secondary spring 11 disposed intermediate secondary shaft 7 and secondary disc 5 and configured to urge secondary disc 5 to a closed position; inner body valve seat support 9, which may act as a retention ring, disposed proximate to fluid outlets 32a,32b and configured to do not disrupt fluid flow within ring disc nozzle check valve 100 as the fluid passes over primary disc 4 and/or secondary disc 5; and one or more fasteners 12 configured to secure retention ring 9 to valve body 1.