Homemade Check Valve (one-way Valve)





Introduction: Homemade Check Valve (one-way Valve)

I made this at home after seeing that they are 15-20 dollars online and even more expensive at stores. I made it for around 6$ and had some of the stuff around the house. It worked perfectly for my compressor.

Step 1: Parts Needed

2- brass hose barbs (whatever size you need for air hose you're using) 1- brass coupler (same thread size as hose barbs) 1- pencil eraser 1- spring 1- rounded thumb tack 1- o-ring Super glue

Step 2: Determine Air Direction

Thread one hose barb into coupler. I made an arrow on mine to show air flow.

Step 3: Make Air Restrictor

Put pencil eraser into the spring and insert rounded thumb tack.

Step 4: Glue O-ring

Super glue o-ring onto other hose barb. Make sure it is slightly smaller than the rim of the barb.

Step 5: Assemble Parts

Put spring into coupler and screw in other hose barb. Make sure the thumb tack's rounded edge is facing the o-ring. This will create a seal when air tries to return to the source. You will have to experiment with the spring and torque of the hose barbs depending on the amount of air you are using. Stretch or compress the spring if needed. I tested mine up to 150 psi with no backflow. This is for inline application, but replace one barb with a nipple if you want to direct-thread it to a tank or other application.



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    Very clever, the O-ring seal.

    Thanks! Sorry for the delayed response. I'm just now seeing this for some reason.

    Interesting concept. Sometimes you just have to jerry rig if they don't make the right sizes that you need. You may want to look into upgrading to a ball bearing instead of the pencil eraser and tack though.

    Thanks for the feedback. I looked around for a ball bearing, but thumb tacks were more readily available. It works great.

    boas parabéns trabalho

    thanks for the info, i tinker with odd projects (water and air) and I'm sure I'll use your idea for a few of my experiments.

    Very clever design, and well worked.

    cheap brass barb fittings: