Replaceable seat for convertible check valve

A method for replacing a valve seat for a convertible check valve having a face gasket and a flapper valve member, the method comprising:

• separating a first valve body section and a second valve body section of the convertible check valve to expose the face gasket;
• removing the flapper valve member and the face gasket;
• selecting a replacement face gasket for the convertible check valve;
• aligning apertures of the replacement face gasket with openings on one of the first valve body section;
• mounting a replacement flapper valve member through a portion of the replacement face gasket into one of the openings;
• and
• securing the first valve body section and the second valve body section over the replacement face gasket such that the replacement face gasket is interposed between the first valve body section and the second valve body section to seal an interface between the first valve body section and the second valve body section, and a portion of the replacement face gasket forms the valve seat for the replacement flapper valve member, wherein the replacement face gasket comprises an O-ring that is a monolithic part of the replacement face gasket, and the O-ring is configured to contact the replacement flapper valve member when the replacement flapper valve member is in a closed state.

A face gasket for a convertible check valve including a first valve body section having a first passageway extending therethrough and a first flange at one end thereof, a second valve body section having a second passageway extending therethrough and a second flange at one end thereof, with the second flange being configured to be connected to the first flange, and a flapper valve member configured to be moved between a closed state and an opened state, the face gasket comprising:

• compressible material applied over a rigid disk;
• an O-ring that is a monolithic part of the face gasket, wherein the O-ring is configured to contact the flapper valve member when the flapper valve member is in the closed state;
• and
• an opening to permit fluid communication between the first passageway and the second passageway,
• wherein the face gasket is configured to be interposed between the first flange and the second flange to seal an interface between the first flange and the second flange, wherein a portion of the face gasket forms a valve seat for the flapper valve member.