Bonnetless swing check valve

A check valve comprising a valve body having a valve chamber therein and inlet and outlet ports communicating with said chamber to define a flow passage through said valve, said valve body being formed of two threadedly joined body members wherein one of said body members provides said valve chamber and said outlet port, the other of said body members provides said inlet port and has an end portion which extends into said valve chamber;

• a valve seat located in the valve chamber and comprising a valve sealing surface in surrounding relation to said flow passage, said valve sealing surface facing towards the outlet port of the valve;
• a valve clapper element;
• a clapper shaft connected to said clapper element by a clapper arm extending substantially perpendicularly from the periphery thereof, said valve chamber having walls defining said valve chamber being provided with slots formed in said walls at opposite sides of the valve flow passage and sized to receive the end portions of the clapper shaft therein, said shaft being axially rotatable, supportable atop said end portion and restrained by said joined body members whereby said valve clapper element is pivotally moveable in the valve chamber between a first valve closed position wherein the clapper element closes the flow passage and a second valve open position wherein the clapper element is in an unobstructing position with respect to the flow passage;
• and
• guide ribs formed on the inner wall of the valve chamber closely adjacent the periphery of said valve clapper at opposite sides of the flow passage, each said guide rib extending in an arc substantially co-extensive with the arc of swinging movement of said valve clapper when moving from the valve open to the valve closed position whereby said valve clapper is maintained in operational alignment with said valve seat and is disposed to effect a seal therewith when in the valve closed position.