Relating to a flow regulator for intravenous injection device

Claim 1

A flow regulator for an intravenous injection device comprising: a cylindrical outer container having a cylindrical outer wall which has a top end and a lower portion with a bottom outlet; an inner container disposed in said outer container and having an inner wall substantially conforming to the shape of said lower portion of said outer wall, said inner wall abutting an inner side of said lower portion of said outer wall, said inner wall having a top open end remote from said top end of said outer container and a restricted tubular bottom end extending out of said bottom outlet of said outer wall, a first cover plate closing said open top end of said inner container, said cover plate having a central opening, a second plate positioned in said inner container below said first plate, said second plate having a first valve seat; a flexible tube sleeved on said restricted tubular bottom end of said inner container, a float valve body provided in said inner container and having an elongated slender upper portion which is suddenly restricted at an upper side of said float body, and an elongated tapered lower portion at a lower side of said float body, said slender upper portion extending through said central opening, said tapered lower portion having an upper portion passing through said valve seat and an end portion extending beyond said restricted tubular bottom end of said inner container and then entering said flexible tube, said upper portion of said tapered lower portion having a first surface portion to contact tightly said first valve seat.