1. East Hill Surfers Flow Control Device Elegant...

2. Reliable...

3. Precise...

4. And DEAD SEXY.

5. Developing The Design Define Criteria Generate Choices Pick it out

6. FCD Criteria Clogging Resistance SizeReliabilityCost Ease of Use / Maintenance Universality

7. Variable Torque Bucket Floating Inlet Air Inlet Prime Design Choices Toilet Float Plug Float

8. Device Decision Matrix

9. Conventional Toilet Lever Valve Schematic Inlet Flow F = A γh L1L1 L2L2 Float Buoyant Force = F B Pin Calculations showed that a lever was excessive for given design parametersCalculations showed that a lever was excessive for given design parameters A simple float could control the low flow rates without a lever arm to amplify the magnitudeA simple float could control the low flow rates without a lever arm to amplify the magnitude

10. Simple Float Valve FCD 8.3 cm 11.0 cm 0.5 cm 4.4 cm 6.5 cm 2 mm 2.3 cm 9.1 cm 2 mm 5.6 cm 1.5 cm 2 cm 5.2 cmHousing Dimensions: ID = 7.85 cm OD = 8.8 cm Float mass: 6 grams IV roller clamp Rubber tip Barb tubing adapter PVC stem IV tubing (~10 drops/mL)

11. Testing Apparatus Assembled PrototypeTesting Apparatus

12. FCD Water Column Manual Valve 7 kPa Pressure Senor – Logs readings to Easy Data

13. FCD Performance

14. Clogging Experiment  Process Controller used to meter water into 10 cm tube. Refilled after head dropped by 40 cm.  Interested in flow rate changes for each 40 cm head drop as well as over several days.

15. Clogging Data

16. What We Learned  Low flow presents lots of problems  Complex and simple designs often do the same job  It is easy to overlook valuable solutions  A simple device can have vast implications in the developing world

17. Further Research  Is there a manufactured device like this already out there? Cost comparison  Cleaning mechanisms  Manufacturing Costs and Opportunities  Material Selection  Maximum head capabilities - Sizing

18. Steve Achieves Inner Constant Flow