LIQUID FLOW RATE CONTROL DEVICE

A fluid flow rate control device comprises a first vented fluid chamber (60) having an upper fluid inlet end with a hollow spike (46). A free floating float valve (70) in the first chamber blocks the flow of fluid into the firs t chamber from a fluid container (12) providing a constant pressure head. A lower end of the chamber is connected, through a flow regulator (66), to an upper inlet end of a second, vented, drip chamber (62), the lower end of whi ch is adapted for connection to a discharge tube. A second, free floating float valve (140) in the second chamber blocks the flow of fluid from the second chamber into the discharge tube when the fluid level in the second chamber i s at or below a preestablished minimum level and blocks flow of fluid into the second chamber when the level in the second chamber reaches a preestablished level.