1. Floating Ball Valve Team DHMO: Barry Schnorr David Harrison Justin Ferrentino Haixian Huang

2. Introduction Create a flow control device that: Create a flow control device that: Controls a constant flow rate of 20 L/day Controls a constant flow rate of 20 L/day Is inexpensive to manufacture Is inexpensive to manufacture Can be connected after a slow sand filter (resistant to clogging) Can be connected after a slow sand filter (resistant to clogging) This requires control of flow before the water level of constant head This requires control of flow before the water level of constant head

3. Floating Ball Valve Calculations Float constraint: F buoyant – F gravity > F pressure d f ρ f ρwρw htht dtdt

4. Head Loss Tubing So: use 1m of 1/16 in. inner-diameter tubing to achieve 17cm of headloss

5. Components Racquet Ball 1/4” Steel Tubing 1/4” PVC Tubing 1/16” PVC Tubing

6. Costs Item Approximate Cost Soda Bottle $ 0.05 Racquet Ball $ 0.50 1/4” Steel Tubing $ 0.15 1/16” PVC Tubing $ 0.25 Bucket (reservoir) $ 2.00 Total$2.95

7. Device in Operation

8. Results from Testing Graph of Flow Rate vs. Reservoir Water Level

9. Results Cont’d Graph of Flow Rate vs. Reservoir Water Level

10. Results Cont’d Graph of Flow Rate vs. Tube Height (Range of Flow Rates Produced)

11. Results Cont’d Flow Rates of Dirty Water over Time

12. Results Summarized Flow rate varied ~ 0.5 L/day from height change of water in bucket Flow rate varied ~ 0.5 L/day from height change of water in bucket As built, device was able to provide flow rates from around 5 to 50 L/day As built, device was able to provide flow rates from around 5 to 50 L/day Over the time device was tested with dirty water, it did not appear to be significantly affected Over the time device was tested with dirty water, it did not appear to be significantly affected

13. Conclusions Easy to construct Easy to construct Easy to calibrate Easy to calibrate Able to produce flow rates over a large range Able to produce flow rates over a large range Able to produce roughly constant flow from a filled 5 gallon bucket Able to produce roughly constant flow from a filled 5 gallon bucket

14. Recommendations Long term testing with dirty water Long term testing with dirty water Standardized construction Standardized construction Screw apart bottle for cleaning Screw apart bottle for cleaning Plastic rather than steel tube (save costs) Plastic rather than steel tube (save costs) Way to attach head loss tubing simply Way to attach head loss tubing simply Bottle mounting w/ SSF Bottle mounting w/ SSF