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De-clogging Procore Valves

Sept. 17, 2016, 8:55 p.m.
Posts: 1713
Joined: Dec. 31, 2006

After some use my procore valves have clogged with dried stans solution. Any advice on de-clogging these valves? I was thinking of dipping them in paint thinner then blowing out the clog with a floor pump.

Sept. 17, 2016, 9 p.m.
Posts: 17868
Joined: Oct. 28, 2003

Hot water and elbow grease.

Sept. 20, 2016, 7:25 a.m.
Posts: 8256
Joined: Nov. 21, 2002

Are the valve cores standard? Maybe just throw new ones in.

WTB Frequency i23 rim, 650b NEW - $40

Sept. 20, 2016, 9:05 a.m.
Posts: 1713
Joined: Dec. 31, 2006

Yeah standard valve cores. I removed and cleaned them as much as I could as well as inside the valve stem but it's still clogged. Guess you need to replace the inner tube every year when it gets too clogged with goop.

Sept. 20, 2016, 11:42 a.m.
Posts: 769
Joined: June 29, 2006

You can actually remove the selector (the special part of the valve) without destroying it. That way you'll get the air out of the tube, even if it is clogged.
You'll be able to clean it and re-insert it.

You'll have to be a bit careful not to destroy it.

Simply take two pliers (with a round grip profile preferably, less likely to damage) and unthread the selector part just like a regular bolt. You need to keep the valve stem part from turning with the second pair of pliers, just grip the stem where it enters the rim hole.

You'll feel quite a bit of resistance at the point where you normally would be able to fill the outer chamber. But simply continue to turn it out and after about two revolutions with more resistance it will turn without resistance again.

It is important that the valve core is still inside the selector while you're gripping it with your pliers, otherwise you'll clamp/bend/crush the threads for the valve core.

Once you have the selector out, you'll understand how it works and why it can be reinserted and be air tight again. It's quite clever.

Be sure to use some good pliers with a gentle grip though. (By grip I mean the part of the tool with which you clamp stuff, I am not a native English speaker…)

Sept. 20, 2016, 11:52 a.m.
Posts: 1713
Joined: Dec. 31, 2006

You can actually remove the selector (the special part of the valve) without destroying it. That way you'll get the air out of the tube, even if it is clogged.
You'll be able to clean it and re-insert it.

You'll have to be a bit careful not to destroy it.

Simply take two pliers (with a round grip profile preferably, less likely to damage) and unthread the selector part just like a regular bolt. You need to keep the valve stem part from turning with the second pair of pliers, just grip the stem where it enters the rim hole.

You'll feel quite a bit of resistance at the point where you normally would be able to fill the outer chamber. But simply continue to turn it out and after about two revolutions with more resistance it will turn without resistance again.

It is important that the valve core is still inside the selector while you're gripping it with your pliers, otherwise you'll clamp/bend/crush the threads for the valve core.

Once you have the selector out, you'll understand how it works and why it can be reinserted and be air tight again. It's quite clever.

Be sure to use some good pliers with a gentle grip though. (By grip I mean the part of the tool with which you clamp stuff, I am not a native English speaker…)

Thanks man.

To confirm, just keep turning the selector counter-clockwise and it will come out? And keep the valve core in.

Sept. 20, 2016, 2:53 p.m.
Posts: 15019
Joined: April 5, 2007

A drop or two of Tri-Flow into the valve stem after inflation helps avoid gummed up valve stems.

Why slag free swag?:rolleyes:

ummm, as your doctor i recommend against riding with a scaphoid fracture.

Sept. 20, 2016, 10:27 p.m.
Posts: 769
Joined: June 29, 2006

Yes, counterclockwise does it.

Sept. 24, 2016, 6:21 p.m.
Posts: 1713
Joined: Dec. 31, 2006

Thanks for the intel Znarf. Got the valve unclogged with your info and a little creativity with the floor pump. Acetone dip might have loosened it up too.

Sept. 24, 2016, 10:59 p.m.
Posts: 769
Joined: June 29, 2006

Cool!

Jan. 23, 2017, 4:24 p.m.
Posts: 183
Joined: July 26, 2005

Am i safe to presume I can do this while everything still installed just deflated?

Jan. 23, 2017, 10:08 p.m.
Posts: 769
Joined: June 29, 2006

Should work. Just be sure to remove pressure from inner and outer chamber first..

Feb. 8, 2017, 10:21 a.m.
Posts: 183
Joined: July 26, 2005

Thanks - wanted to make sure I didn't need to take it all off.the rim too.

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