Plastic barrel bung cap with floating checkvalve
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Floating checkvalve for rainwater barrel, lets air out but closes when the barrel is full with water
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- Printables
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- Outdoor & Garden
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- Creative Commons — Attribution
Plastic barrel bung cap with floating check valve
This cap is made for sealed rain water barrels with 55 mm caps. The checkvalve consists of a table tennis ball, a 36mm o-ring, M2.5x5mm screw and some printed parts.
When the water level is low the valve is open and ventilates the barrel. When the water level reaches the valve it will automatically close. The table tennis ball is the floating element which lifts a piston that then seals with an o-ring against the cap. If the water level is low gravity will keep the valve open.
The float parts (top & bottom) has a brim integrated into the modelled which is removed after printing.
Hardware needed:
Table tennis ball
36x3.1 O-ring (ODxt)
M2.5 × 5 mm screw
Reused seal for cap or printed from tpu, se
Printing:
PLA/PETG/ABS
Layer height .1 mm (to make cap thread better)
Flow ratio: 1.05 (or whatever suits your printer, a small overextrusion is needed to make the parts water tight
Suggested colors:
If the colors are choosen as below the cap will show green when open and when closed the red stem will rise up showing that the valve is closed.
Cap: Whatever you like best,
Float (Top and bottom): Red
Stop: Green
Assembly:
1. Put the table tennis ball between the top and bottom float and twist until the latch mechanism latches
2. Insert the foat assembly stem into the corresponding opening on the cap
3. Use the M2.5 Screw to screw the "stop" onto the steam.
4. Install the check valve on you barrel. :)
Update 1:
Updated float_top to version 2. Added a larger "lip" to keep the o-ring in place. Previously the there where some pressure in the barrel and the valve was manually pushed down the o-ring would get lose.