DIY: Adding a Valve to PVC Tube for Bicycle Pump

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Discussion Overview

The discussion revolves around the process of adding a valve to a PVC tube for use with a bicycle pump. Participants explore various methods, materials, and considerations for achieving a secure and functional installation, including the use of adhesives and the appropriate size of the hole for the valve.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests drilling a clean hole in the PVC end cap to fit a valve from a tire shop and using epoxy to seal it.
  • Another participant argues against the need for epoxy, stating that a clean hole without burrs should suffice, referencing their experience with valve stems.
  • A participant expresses confusion about how the valve is held in place, questioning whether it is threaded.
  • Another participant proposes that a smaller hole is required and suggests drilling a hole with a 0.030" over clearance for the valve.
  • One contributor explains that the valve stem has a conical shape that fits into a groove, which holds it in place, and emphasizes that the hole should be slightly smaller than the diameter of the groove.
  • A participant mentions the importance of using a tool to assist in installing the valve stem and advises against using petroleum-based lubricants.

Areas of Agreement / Disagreement

Participants express differing opinions on the necessity of using epoxy for sealing the valve and the appropriate size of the hole for installation. There is no consensus on these points, and the discussion remains unresolved regarding the best approach.

Contextual Notes

Participants reference personal experiences and suggest varying methods without establishing a definitive procedure. The discussion includes assumptions about the valve design and installation techniques that may not be universally applicable.

Moose352
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I'd like to put a valve (like the ones on tire tubes) that will connect to a bicycle pump onto a PVC tube (on the side, or at the end). Anyone know how I can do this? What fittings will I need?

Thanks.
 
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How strange; I did this once.

The valve assembly should fit nicely in a clean hole made in the end cap for the PVC pipe. Just get a valve from a tire shop and drill the hole to size. I think I used epoxy to seal the joint.
 
Don't bother with the epoxy. As long as the hole is not burred it will be fine. I have never seen a valve stem sealed with anything other than a little bit of soap solution when pulling it through the hole in the rim.
 
Actually, I think you're right. I am thinking that I got some but never needed it.
 
Maybe I'm missing something, but I don't understand what is holding the valve in place? Is the valve threaded or something? Thanks for the help guys.
 
Moose352 said:
Maybe I'm missing something, but I don't understand what is holding the valve in place? Is the valve threaded or something? Thanks for the help guys.

I was going to ask the same question. I think you'll need the epoxy, after all. Just drill out a 0.030" over clearance hole and stick it in place.

I've used (Emerson & Cuming) Stycast 2850 epoxy to seal between PVC and stainless steel. I'm sure there's cheaper glues that will work just as well.
 
Last edited:
Go buy a valve stem and you will undestand. NO GLUE is required. Just a little soapy water to allow the valve stem to slide in easily.

BTW, a smaller hole is required, not something .030 over.
 
Averagesupernova,

Are you perhaps suggesting the drill hole be just right to make a tight fit ?
 
Alright, I'll trust you and go ahead without the epoxy. Thanks for the help!
 
  • #10
I have changed MANY tires. So many in fact that I own a tire machine. The valve stem is conical up to a point. Then it suddenly drops off into a groove. This groove is what holds it in the hole and yes the hole should be slightly smaller than the diameter of the groove. You would think then that it is impossible to remove the stem once it is in place. This is not so. It can be pried out again, but it is a major hassle. When you buy the stem, also buy the tool that is used to thread over the threaded part of the stem to pull it through the hole. The tool is a little tee-handle affair. It threads onto the part of the stem that the cap normally threads onto. Just be sure to use lots of 'lube' when installing. Use a good slippery dish washing soap. Don't use a petroleum based product.
 

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