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A fluid flow control device comprising a cylindrical housing adapted to be sealably positioned in a fluid flow system and having a passageway therethrough for the flow of fluid under pressure. The housing defines fluid entrance and exit ports with each port defining a spherical valve seat in the hou

A fluid flow control device comprising a cylindrical housing adapted to be sealably positioned in a fluid flow system and having a passageway therethrough for the flow of fluid under pressure. The housing defines fluid entrance and exit ports with each port defining a spherical valve seat in the housing. A weighted spherical ball is positioned in the housing to float in the housing during normal fluid flow therethrough but seats in said spherical seats during adnominal fluid conditions in the housing.

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A fluid flow control device comprising: a cylindrical housing comprising two telescopically interconnecting parts adapted to be sealably positioned in a fluid flow system and having a passageway therethrough for the flow of fluid under pressure, said housing defining a fluid entrance port and a flui

A fluid flow control device comprising: a cylindrical housing comprising two telescopically interconnecting parts adapted to be sealably positioned in a fluid flow system and having a passageway therethrough for the flow of fluid under pressure, said housing defining a fluid entrance port and a fluid exit port, one at each end thereof, each of said ports defining a conical valve seat in said housing, a weighted spherical ball positioned in the passageway in said housing, the diameter of said ball being substantially less than the diameter of said passageway. said ball comprising a solid metallic spherical core having a plastic coating of a predetermined thickness surrounding it, the size and weight of said ball determining the thickness of the plastic surrounding it for selective use in fluid flow systems of different pressures, said ball floating in said passageway between said conical seats when normal pressure exists in said housing during fluid flow therethrough and seats in one of said conical seats during predetermined adnormal fluid conditions in said housing.