A double check valve that generally includes a modular fluid casing having a main housing, a one-piece modular cage, and at least one in-line check valve removably housed in the modular cage. Check Valves A check valve arrangement, comprising: a housing having an inlet end and an outlet end and defining a flow channel therebetween formed by sidewalls and a bottom wall of the housing, the flow channel in fluid communication with said inlet end and said outlet end; a modular cage removably secured to said housing, said modular cage having a first open end and a second open end removably seated within the flow channel of said housing, said modular cage defining an interior cavity, the interior cavity defining a first diameter portion and a second diameter portion, and wherein the interior cavity of said modular cage is in fluid communication with said inlet end and said outlet end and said flow channel of said housing,SAFETY VALVES and wherein said modular cage is a one-piece non-movable construction prior to and after placement within said housing; and a plurality of check valves removably seated within the first diameter portion and the second diameter portion of the interior cavity of said modular cage, wherein said check valves are in fluid communication with said inlet end and said outlet end of said housing. The present invention provides for a modular fluid casing that includes a housing and a modular cage. The housing has an inlet end and an outlet end and defines a flow channel therebetween. The flow channel is in fluid communication with the inlet end and the outlet end of the housing. The modular cage having a first open end and a second open end and defining an interior cavity is received within the flow channel of the housing. The interior cavity of the modular cage is adapted to be in fluid communication with the inlet end and the outlet end of the housing. The interior cavity of the modular cage is also adapted to receive at least one check valve. The present invention also provides for a check valve arrangement that includes the modular fluid casing having the modular cage and the housing as previously discussed, wherein the modular cage is removably seated within the flow channel of the housing. A plurality of check valves are removably seated within the interior cavity of the modular cage, wherein the check valves are in fluid communication with the inlet end and the outlet end of the housing. The interior cavity may define a first diameter portion and a second diameter portion, wherein a diameter of the first diameter portion and a diameter of the second diameter portion are different. A lip can separate the first diameter portion from the second diameter portion of the interior cavity of the modular cage. Alternatively, the first diameter portion and the second diameter portion of the interior cavity can have the same diameter. The present invention provides for a method of installing check valves in line with respect to a fluid conduit using a modular casing as previously discussed. The method includes inserting at least one check valve into the interior cavity of the modular cage. Second, the modular cage is inserted into the flow channel of the housing. Third, the modular cage is secured to the housing. Fourth, the modular casing is installed in line with respect to a fluid conduit.

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