40mm pressure relief valve
thingiverse
Pressure Relief Valve Prevents Dust Extraction System Collapse When Blast Gates are Closed. Watch in action: https://youtu.be/qsIcvbP6d3U This valve is designed specifically for UK 40mm solvent weld waste pipes (FloPlast), but it may be a bit loose depending on your printer or pipe fittings. To make adjustments, use the Fusion 360 file and change the outerDiameter parameter. A 50mm long, 12mm diameter spring with a compression of 0.5*12*50 is required for this valve (available on eBay at https://www.ebay.co.uk/itm/10pcs-304-Stainless-Steel-Spring-Compression-Pressure-Compressed-Small-Spring/401365367455). If you need to use a shorter spring or more compression, modify the springDepth setting accordingly. However, this adjustment is not very precise. The valve handle requires an M3 heat fit insert or can be modified for a self-tapping design.
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