Abstract: A swing-type check valve (10) having a bonnetless two-piece valve body (12, 14) with a valve chamber (22) and inlet and outlet ports (15, 21) defining a flow passage through the valve. A clapper (25) fixed to a clapper shaft (28) is restrained in working location by the two valve body members as mated in assembly and is adapted for pivotal movement between a valve open position and a valve closed position. A planar valve sealing surface (23) is provided on the end of one of the valve body members and positioned in the valve chamber in a location where it is protected from erosion from flow through the valve and adapted to be sealingly engaged by the clapper element (25). Guide ribs (40) are formed in the valve body for guiding the clapper (25) in movement between its valve open and valve closed positions so as to insure a seal by the valve clapper (25) when in its valve closed position irrespective of the orientation of the valve.