Check Valve

A check valve comprising:

• a valve body which includes an inlet end, an outlet end, a flow bore that extends between the inlet and outlet ends, a cavity which intersects the flow bore, and an opening which is connected to the cavity, the flow bore comprising an inlet bore portion which extends between the inlet end and the cavity and an outlet bore portion which extends between the outlet end and the cavity;
• a body cap which is removably secured in the opening;
• a seat cartridge which is configured to fit through the opening and be slidably received in the cavity, the seat cartridge comprising an open first end which is positioned adjacent to and aligned with the opening, a second end which is located opposite the first end, a chamber which extends between the first and second ends and defines an inner wall of the seat cartridge, a first bore which extends between the chamber and the inlet bore portion, a second bore which extends between the chamber and the outlet bore portion, and a valve seat which is formed on a portion of the inner wall that surrounds the first bore;
• a retainer ring which is positioned in the valve body between the body cap and the first end of the seat cartridge;
• and
• a flapper which is pivotally connected to the retainer ring, the flapper being pivotable through the chamber between a closed position in which the flapper is positioned against the valve seat and an open position in which the flapper is displaced from the valve seat.