represented by the arrow w 2 valve housing side wall 58 is fabricated such that the flow path area at inlet 42 is substantially equal to the flow path area at valve outlet 48 when control members 62 and 64 are fully opened thereby facilitating minimizing pressure loss through check valve 40 in an exemplary embodiment valve housing side wall 58 is formed with an outward conical flare having a cone angle u03b2 relative to the flow path centerline 110 angle u03b2 is measured between valve inlet 42 and valve outlet 48 and is selected to provide an outlet flow path width w 2 that is substantially equal to inlet flow path width w 1 in an exemplary embodiment angle u03b2 is approximately seventy three percent of the stabilization angle u03b2 check valve 40 is assembled by pressing bushings 94 into control member mounting arms 90 control members 62 and 64 are then positioned within valve housing 56 such that retaining pin second end 84 is inserted through aperture 72 through interleaved control member mounting arms 90 and into cavity 76 retaining nut 88 is then installed in aperture 72 to retain retaining pin 74 therein retaining nut 88 is safety wired to valve housing 56 to prevent retaining nut 88 from uncoupling from housing 56 a plug or pressure sensor fitting is installed in pressure sensor port 68 as desired the plug or pressure sensor fitting can also be safety wired in place thus assembly of check valve 40 is accomplished with a minimal number of parts in one embodiment check valve 40 can be used in a system to.