A system for controlling fluid flow comprising: a drip chamber holster configured to receive and secure a drip chamber; an imaging device configured to capture images of the drip chamber thereby creating image data; a light emitting device configured to emit at least one pattern of light onto the drip chamber and into the field of view of the imaging device; a flexible tube defining a lumen operatively connected to the drip chamber, the lumen in fluid communication with the drip chamber; and a valve axially disposed around a portion of the flexible tube to control flow through the drip chamber, the system being characterized by the valve comprising: a valve casing (8504, 8502) comprising a first clamshell portion and a second clamshell portion pivotally connected together to complementarily align to form an enclosure when in a closed position, wherein the enclosure defines an inlet hole and an outlet hole when closed, wherein the first clamshell portion defines a plunger hole; a male latch component coupled to the second clamshell portion opposite the pivot connection; a female latch component operatively coupled to the first clamshell portion opposite the pivot connection; a substantially incompressible filler enclosed within the valve casing (8504, 8502), the filler comprising: a first layer of material (8622, 8628), and a second layer of material (8624, 8626) disposed within the first layer of material (8622, 8628) and defining a conduit sized for the flexible tube, wherein the conduit connects the inlet hole and outlet hole of the valve casing (8504, 8502), wherein the second layer of material (8624, 8626) is stiffer than first layer of material (8622, 8628); a plunger longitudinally aligned with the plunger hole; and an actuator operatively connected to the plunger, to urge the plunger through the plunger hole thereby engaging the filler and ultimately deform the flexible tube. a drip chamber holster configured to receive and secure a drip chamber; an imaging device configured to capture images of the drip chamber thereby creating image data; a light emitting device configured to emit at least one pattern of light onto the drip chamber and into the field of view of the imaging device; a flexible tube defining a lumen operatively connected to the drip chamber, the lumen in fluid communication with the drip chamber; and a valve axially disposed around a portion of the flexible tube to control flow through the drip chamber, the system being characterized by the valve comprising: a valve casing (8504, 8502) comprising a first clamshell portion and a second clamshell portion pivotally connected together to complementarily align to form an enclosure when in a closed position, wherein the enclosure defines an inlet hole and an outlet hole when closed, wherein the first clamshell portion defines a plunger hole; a male latch component coupled to the second clamshell portion opposite the pivot connection; a female latch component operatively coupled to the first clamshell portion opposite the pivot connection; a substantially incompressible filler enclosed within the valve casing (8504, 8502), the filler comprising: a first layer of material (8622, 8628), and a second layer of material (8624, 8626) disposed within the first layer of material (8622, 8628) and defining a conduit sized for the flexible tube, wherein the conduit connects the inlet hole and outlet hole of the valve casing (8504, 8502), wherein the second layer of material (8624, 8626) is stiffer than first layer of material (8622, 8628); a plunger longitudinally aligned with the plunger hole; and an actuator operatively connected to the plunger, to urge the plunger through the plunger hole thereby engaging the filler and ultimately deform the flexible tube. a valve casing (8504, 8502) comprising a first clamshell portion and a second clamshell portion pivotally connected together to complementarily align to form an enclosure when in a closed position, wherein the enclosure defines an inlet hole and an outlet hole when closed, wherein the first clamshell portion defines a plunger hole; a male latch component coupled to the second clamshell portion opposite the pivot connection; a female latch component operatively coupled to the first clamshell portion opposite the pivot connection; a substantially incompressible filler enclosed within the valve casing (8504, 8502), the filler comprising: a first layer of material (8622, 8628), and a second layer of material (8624, 8626) disposed within the first layer of material (8622, 8628) and defining a conduit sized for the flexible tube, wherein the conduit connects the inlet hole and outlet hole of the valve casing (8504, 8502), wherein the second layer of material (8624, 8626) is stiffer than first layer of material (8622, 8628); a first layer of material (8622, 8628), and a second layer of material (8624, 8626) disposed within the first layer of material (8622, 8628) and defining a conduit sized for the flexible tube, wherein the conduit connects the inlet hole and outlet hole of the valve casing (8504, 8502), wherein the second layer of material (8624, 8626) is stiffer than first layer of material (8622, 8628); a plunger longitudinally aligned with the plunger hole; and an actuator operatively connected to the plunger, to urge the plunger through the plunger hole thereby engaging the filler and ultimately deform the flexible tube.