Talbot Type Water Tap

Talbot Type Water Tap

Project developed by Eric Bauer

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Abstract

• Talbot water taps are used extensively throughout the low income countries of the world. This type of tap is extremely useful for them, but is often quite expensive to purchase; sometimes so expensive that they can't get them. This type of tap allows for automatic shutoff of the water when it is released due to the water pressure pushing it closed. This 3D printable version is 89% cheaper than a standard quarter turn water tap (these are even cheaper than a Talbot tap). Not only is this OSAT low cost, it is also extremely easy to make: simple 3D print, no support material, no extra tools needed, and a very simple assembly procedure.
• Talbot Type Water Tap - closed position

  

Bill of Materials

• Printed Parts

1. Talbot Body (quantity = 1)
2. Talbot Housing (quantity = 1)
3. Talbot Cap (quantity = 1)
4. Talbot Pin (quantity = 1)
5. link to part files and STL files

• Purchased Parts

1. Square cross section o-ring (quantity = 1) [link to part]
2. Circle cross section o-ring (quantity = 2) [link to part]

Tools needed for fabrication of the OSAT

• MOST Delta RepRap or similar RepRap 3-D printer

Skills and Knowledge Necessary to Make the OSAT

• N/A

Technical Specifications and Assembly Instructions

• Printing Directions

1. Print speed = 100 mm/s
2. Layer height = 0.10 mm
3. Infill = 100%
4. Print temp = 210 deg. C
5. Material = PLA
6. No support needed for any of the prints

• Assembly Directions

1. Start with tablot body [Picture]
2. Put two circle profile o-rings into the grooves of the talbot body [Picture]
3. Slide the talbot housing over the small diameter end of the talbot body [Picture]
4. Slide the square profile o-ring over the small diameter end of the tablot body [Picture]
5. Slide the tablot cap over the small diameter end of the talbot body and line up round holes in tablot body and talbot cap [Picture]
6. Press talbot pin into the round holes that were just lined up [Picture]
7. Thread finished part into desired 3/4" NPT female pipe fitting [Picture]

• Print time estimate = 3 hours and 55 minutes
• Assembly time estimate = 10 minutes

Common Problems and Solutions

• Ensure your printer settings allow for accurately sized parts. If parts aren't properly sized, o-rings may not seal or will be too tight.

Cost savings

• Commercially Available Option

1. Talbot valves are sold on a "request a quote" price basis, but are understood to be more expensive than standard quarter turn style taps. Because of this, I was unable to find a price for a Talbot valve and will be comparing this valve to a standard quarter turn style tap.
2. $14.41 for a standard quarter turn style tap

• Price Breakdown

1. 48g of PLA = $0.96 (assuming $20/kg)
2. square profile o-ring = $0.35 per valve (1 o-ring needed)
3. circle profile o-ring = $0.27 per valve (2 o-rings needed)
4. TOTAL COST = $1.58 per valve

• Price Comparison

1. Commerical = $14.41
2. 3D Printable = $1.58
3. 89% cost savings

Benefited Internet Communities

• Appropedia Requests for 3D Printable Open Source Appropriate Technology
• OSAT
• Open Source Hardware Association
• African Open Source Center
• OpenSource.com

References

• The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> tags and can be in any format but should include all the information necessary for someone else to find the same information you did. ^[1]