Backflow check valve for use with IV administration sets

A backflow check valve for use with IV administration sets comprising:

• a female hub having a flow passage defined therethrough and a valve seat defined in said female hub;
• a male hub having a flow passage defined therethrough and a coupling section thereon, said flow passages being positioned so that fluid communication can be established therebetween;
• a sonic weld connecting said male and female hubs together;
• a flow control disc movably located within said female hub flow passage and movable from a first position seated on said valve seat occluding said female hub flow passage to prevent backflow of fluid from said male hub to said female hub flow passage to a second position in which the entire disc is spaced from said valve seat permitting flow of fluid from said female hub to said male hub;
• disc abutment means on said male hub for preventing a disc from moving into said male hub flow passage, said abutment means being spaced from said valve seat so that said disc traverses a gap before abutting said abutment means, said abutment means including a plurality of skirt members spaced apart circumferentially around said male hub flow passage and extending longitudinally of said male hub, and a cross rib attached to said male hub and extending across said male hub flow passage said cross rib being spaced longitudinally from said skirt members;
• and
• disc flow bypass means on said male hub for permitting fluid to flow from said female hub flow passage through said gap and past said disc and into said male hub flow passage, said bypass means including spaces between said skirt members fluidly connecting said male hub flow passage to said female hub flow passage so that fluid can bypass said flow control disc when said disc is seated on said skirt members.