Strange type of tyre valve

johnyfartbox

A2OC Donor
DSC_0011 (2).jpg


As per title, Ive never come across this type of valve before and simply cannot remove the cap on the top.
Anyone else ever come across this type before and how would I remove the cap to inflate the tyre? the black bit just spins around by the way but the brass bit is solid. Ive attempted the prise off the top bit but no joy, also attempted to turn it with a small bradall type gadget to turn it but again, no joy.
TIA .
John.
 

steve_c

A2OC Donor
The photo isn't very clear, but they look to be metal valve caps. They very often get corroded onto the valve inside and end up damaging the valve trying to remove them with force.
Particularly likely if the caps are aluminium. Bimetallic corrosion occurs almost as soon as wet weather hits. Aluminium caps are popular as they tend to be cheap, but should only be fitted to specialist aluminium valves.
 

johnyfartbox

A2OC Donor
Im taking on board what you're saying guys but im wondering if these are slightly different to the ones you are thinking of simply because the black part of the valve cap isnt stuck, it freely spins around as though its some kind of cover, the cover at the top with the tiny hole is solid so maybe the threads that hold that part in is as you say Steve_c is suffering from Bimetallic corrosion .
Thanks for your suggestions though.
 

kp 115

A2OC Donor
View attachment 58206

As per title, Ive never come across this type of valve before and simply cannot remove the cap on the top.
Anyone else ever come across this type before and how would I remove the cap to inflate the tyre? the black bit just spins around by the way but the brass bit is solid. Ive attempted the prise off the top bit but no joy, also attempted to turn it with a small bradall type gadget to turn it but again, no joy.
TIA .
John.
Hi
Have you tried putting a small Allen key in the hole & rotating the cap to see if it drops into a corresponding hole 🕳 this allowing removal?(security feature)
If not maybe below would get it off
I would cut length ways down the cap with either a dremmel or standard fine toothed hacksaw blade until you reach the threads then prise the cap apart with a flat bladed screwdriver.
The outer thread is only used to secure the cap & any damage will not affect the valve .

Hth
Keith.
 

steve_c

A2OC Donor
I'm assuming that you have a set of wheels with that style of valve cap. Are they all equally resistant to removal? If one comes off, you'll be far better able to see where the likely problem is.
 

johnyfartbox

A2OC Donor

Valpen

Member
I am not sure of the size of the hole in the center disc, but find a stiff wire that fits properly (welding rod? or heavy duty paper clip?) and make a "U" so that one arm of the U goes into the hole (if the center disc also spins, find the point where it must engage with something further "in" and doesn't spin), and one arm (longer?) goes down the side of the cap along the valve stem. Then gently grasp the cap with a pair of pliers so that you trap the longer arm on the outside of the cap against the cap, and turn it so that the "U" that is stuck in the hole allows you to remove the cap.
From the eBay link you posted, the "key" for removing the caps appears to be just a pin that engages with something in the hole of the center disc and has a handle so you can spin the cap off/on.
Failing that approach, you might consider carefully putting some SuperGlue in the hole to lock the outer spinning tube to the inner cap...

As the center disc bit appears to be brass, and lots of valve stems have threaded brass end-tips, you might not have a corrosion problem, just a tight fit.
 
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