might be used as an add on component to a standard intravenous administration set fig6 shows the ivfbv manufactured as an integral part of an intravenous administration set with a syringe 17 attached to the stopcock 6 fig7 depicts a bypass valve in which the one way pressure operated valve 30 is separate from the twr 4 the pressure operated valve is attached to proximal tubing 31 which is connected to one branch of proximal y split 32 the stem of the proximal y split is inserted in an iv fluid bag the pressure operated value is also attached to distal tubing 33 which is connected to distal connector 34 shown as a stopcock a traditional n set extends from the other branch of the proximal y split to the distal connector fig8 demonstrates an alternative embodiment with annular pvc rings and the spring in a position similar to that described above the plunger handle 18 faces downwards within the spring the plunger head 19 sits on top of the spring and in the neutral position seals against the underside of the proximal annulus fig9 demonstrates the ivfbv with a clip 20 applied that distorts the shape of the proximal annular pvc ring fig1 shows a top view of the proximal annular ring which is in the shape of a doughnut 14 and the ball bearing underneath the ring 15 shown here in a dotted line the housing 12.