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The purpose of this tutorial is to build a simple remotely operated pressure release valve out of common materials requiring no special tools.Backgrou...
2 x Gardena quick connectorsGardena extension adaptorHose clampEpoxy glueSewing pin with a round headNylon String
ScissorsDrillScrewdriverSandpaperPliersBlu-Tack / plasticine / modelling clay
If you are going to fit this mechanism to a launcher that does not require a non-return valve then you can skip steps 3 - 9. We start with an integrat...
Put a piece of Blu-Tack, plasticine or modelling clay on the workbench and stand the Gardena connector on it's end (orange collar pointing up) so that...
Mix up some epoxy and carefully pour it through the open end. Pour enough epoxy in so that it is about 1cm deep.
Let the epoxy fully cure for at least 24 hours. It is better to use the longer cure but stronger epoxy than the 5 minute stuff.
When the epoxy has cured, drill a small hole through the center of the epoxy. The hole should be smaller than the head of the pin. Usually about 1.5 -...
Insert the pin so that the head is on the inside of the coupling. With the sharp end pointing out of the hole.
Cut the sharp point off and bend the end of the pin 90 degrees. The bent section should be about 3 mm and there needs to be about 5mm movement of the ...
For illustration we show the launch abort valve fitted to a simple Gardena launcher.
Here we cut the garden hose air line where we want to fit the abort valve.
Insert the two hoses into the respective couplings making sure that the one with the non-return valve is closer to the air source. Tighten the couplin...
Put a hose clamp around the coupling with the non-return valve and pinch two ends of loop made from a short length of string under it.Tie a string aro...
The pressure release valve is now complete. You will want to attach the hose near the rocket to the launcher so that it does not move when you pull on...
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