Swing-type check valve assembly having an integrated valve seat and valve housing cover

A swing-check backflow preventer comprising:

• two swing-check valves disposed within a valve housing in linear combination with one another, said valve housing including two ports for fluid flow therethrough and at least one removable cover, and each swing-check valve including
• a valve assembly disposed within the interior of said valve housing for controlling the fluid flow through said valve housing, said valve assembly including means for attaching said valve assembly to said cover for removal of said valve assembly from said interior of said valve housing simultaneously with removal of said cover from said valve housing and further including as a modular unit
• a seat subassembly including a valve seat that is frictionally positionable within a port of said valve housing when said cover is mounted to said valve housing so that fluid flow through the port flows through said valve seat,
• a clapper subassembly having a clapper pivotable between a first position in abutting engagement with said valve seat for preventing fluid flow through the port and a second position out of engagement with said valve seat for permitting fluid flow through the port, and
• a spring subassembly that urges said clapper towards said first position.

A swing-check valve for controlling fluid flow comprising:

• a valve housing having a port for fluid flow therethrough and including a removable cover for accessing an interior of said valve housing;
• and
• a valve assembly including a valve seat mounted directly to said cover and retained in fixed disposition within the interior of said valve housing only through said mounting to said cover and through frictional engagement between said valve seat and said port,
• whereby said valve assembly is removed from said valve housing simultaneously with removal of said cover from said valve housing.