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Frame pump hose for Schrader valve? How do you use it?

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Frame pump hose for Schrader valve? How do you use it?

Old 04-21-19, 11:57 AM
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krecik
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Frame pump hose for Schrader valve? How do you use it?

Hi, found this hose in a frame pump. It appears to be for Schrader valve, I have attached some photos. It doesn't seem to have a pushing pin of any kind inside so I thought maybe it pushes it in by the pressure it exerts during pumping so I tried it but it doesn't seem to push the air in.<br /><br />Any thoughts? How do you use it. Am I doing something wrong?<br /><br />Thanks<br /><br />Kret <img src="https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/1340x2000/imgp7912_3d30f737f105cbe960b7a62ed710fe94e8a5498d.jpg"/><br /><img src="https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulletin/1340x2000/imgp7915_75af4a0c3d731fb9a200411ef5a3b43c2c549e49.jpg"/>
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Old 04-21-19, 12:11 PM
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edit: sorry, it got all messed up during an edit.Hi, found this hose in a frame pump. It appears to be for Schrader valve, I have attached some photos. It doesn't seem to have a pushing pin of any kind inside so I thought maybe it pushes it in by the pressure it exerts during pumping so I tried it but it doesn't seem to push the air in.Any thoughts? How do you use it. Am I doing something wrong?ThanksKret
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Old 04-21-19, 12:24 PM
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The other end is screwed into the pump..

Back in the 80s WTB changed the handle on a Zefal soliblock pumps
so rather than fit between 2 clips on the outside of the frame.

the pump fit inside the oversized seat post tube, so It would not fall off on single track rides

Plunger is a tube, so the hose fit inside..

(only check valve is in the valve stem so pump has to overcome the valve core spring , on schrader valve stems )






.
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Old 04-21-19, 12:29 PM
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Did you buy the pump & hose new or used?

You're right, it should have a pin in there somewhere.

The hoses may be pretty universal, hopefully.

I have a floor pump with a bad pin, and one can overcome the valves with a significant amount of pressure, but it has to have a secondary valve in the pump, and I don't think I'd want to do that with a frame pump.

EDIT:
@fietsbob is probably correct, no valve in the pump. It sounds like a poor design. You might want to "burp" the tire before trying to inflate like one does with presta valves.
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Old 04-21-19, 12:31 PM
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Originally Posted by fietsbob View Post
The other end is screwed into the pump..
I know you knob! What you take me for, some kind of an idiot?

Originally Posted by fietsbob View Post
only check valve is in the valve stem so pump has to overcome the valve core spring , on schrader valve stems
So what overcomes the force of the core spring? Is it the pumping pressure, cause there is no pin inside the hose, have a look for yourself, I attached the photo.

Kret
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Old 04-21-19, 12:40 PM
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Originally Posted by CliffordK View Post
Did you buy the pump & hose new or used?

You're right, it should have a pin in there somewhere.

The hoses may be pretty universal, hopefully.

I have a floor pump with a bad pin, and one can overcome the valves with a significant amount of pressure, but it has to have a secondary valve in the pump, and I don't think I'd want to do that with a frame pump.

EDIT:
@fietsbob is probably correct, no valve in the pump. It sounds like a poor design. You might want to "burp" the tire before trying to inflate like one does with presta valves.
I bought it used, found it in a charity shop. But it doesn't seem like a pin was part of its construction. It doesn't look broken at all, there's nothing rattling inside.

It's ok, I can still use the pump with another hose but I was curious. I thought there might be another valve type I haven't heard of yet.

Anyway, I'll try it again by applying more pressure, maybe that's just how it is.

Btw, before anyone suggests it, I do have other pumps, I'm not in dire straits, I'm just curious about it.

Kret
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Old 04-21-19, 12:49 PM
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Advantage: Presta valves, only the air pressure differential closes the check valve in the stem .
so you don't have the valve core spring to work against, with every pump stroke.

If, there were there a pin holding the S/V open, it would not retain any air pressure increase,
but push back on the handle.

in a Floor pump there is a check valve in the base,
when you take the pump head off the valve stem , only what's in the hose vents off..
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Old 04-21-19, 01:19 PM
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The pump head is missing the valve in the head that depressed the valve stem on the tube. I used to have an old Zefal pump back in the early 1980's with a hose like that.
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Old 04-21-19, 01:35 PM
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convert to P/V tubes .. you can screw onto the adapter ..

I have a Campag Steel pump head with the same thread as the hose to pump thread ..

Rather rare , it seems ..

I thought there might be another valve type I haven't heard of yet.
There is .. Woods Dunlop valves

inside latex rubber hose is the check valve ..

Last edited by fietsbob; 04-21-19 at 01:41 PM.
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Old 04-21-19, 01:37 PM
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Originally Posted by drlogik View Post
The pump head is missing the valve in the head that depressed the valve stem on the tube. I used to have an old Zefal pump back in the early 1980's with a hose like that.
Hmm? Valve head... missing? Googles it...

Indeed, the other Schrader hose I found on ebay has a push pin inside, like so:

https://www.ebay.co.uk/itm/Raleigh-F...l4275.c10#rwid

Seems like an easy fix, I'll try to repair it, I have a sentiment for old things, even tho I hate and don't use Schrader valves on my bike. In agreement with @fietsbob, I much prefer presta valves.

Kret
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Old 04-22-19, 09:41 AM
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That might be a hose made for inflating balls, toys, etc. where you insert a needle into the end. I've seen small pumps with hoses like that made solely for needles.
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Old 04-22-19, 10:59 AM
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I prefer those frame pumps with a hose. In fact...Iíve made a couple of them myself and keep one with me on the bike. There have been a few times without a hose that Iíve broken the preseta valve tube off trying to hold the pump head onto it. The hose I made has a preseta adapter on one end with the Schrader screwed onto the hose (and glued/clamped securely). The other end of the hose has an old preseta valve screwed into it. When I need to inflate, I screw the Schrader adapter end onto the valve, and then put the pump onto the hoseís presta valve on the other end. This prevents me from inadvertently torquing and breaking the valve tube. (Iíd post a pic of it but Iím traveling right now and donít have one with me.

Dan
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Old 04-22-19, 11:27 AM
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Originally Posted by fietsbob View Post
convert to P/V tubes .. you can screw onto the adapter ..

I have a Campag Steel pump head with the same thread as the hose to pump thread ..

Rather rare , it seems ..



There is .. Woods Dunlop valves

inside latex rubber hose is the check valve ..
Heard of those. They're the ones that you have to 'burp' right? My mams got those on her bike. But the latex rubber system is obsolete from what I know, the ones on my mams have a different check valve. My dad said he had those rubber ones on his bike back in the day but you had to replace the rubber every so often when it turned dry rotted and didn't hold the air anymore.

Only reason I know is because a rubber hose like that came as part of a poundshop puncture repair kit I bought for my bike. I didn't know what it was and I was gonna dash it but then I was told otherwise.
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Old 04-22-19, 11:30 AM
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Originally Posted by Crankycrank View Post
That might be a hose made for inflating balls, toys, etc. where you insert a needle into the end. I've seen small pumps with hoses like that made solely for needles.
Could be, but then why would it come with a frame pump?

Kret
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Old 04-22-19, 12:07 PM
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'Burping' is when your tubeless tire wheel loses all of the air in it at once .. in , say , a sharp corner ..

Presta valve stems have a locknut , you break loose the sticking of the valve stem's check valve seat
after loosening that nut, by tapping on the shaft the little nut is attached to ..





...
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Old 04-22-19, 01:05 PM
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Originally Posted by krecik View Post
Could be, but then why would it come with a frame pump?

Kret
Excellent point. I forgot that part about the frame pump.
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Old 04-22-19, 01:48 PM
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Originally Posted by Crankycrank View Post
Excellent point. I forgot that part about the frame pump.
Ah, d'you know what? I don't even care anymore. Like I said before, after closer inspection, there doesn't seem to be anything missing, there's no place a potential pin could have been installed. I'll just shelf it away as a "mysterious" object of sorts that I might need once in a while to pump a ball or an air mattress.

Kret
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Old 04-22-19, 01:51 PM
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Originally Posted by fietsbob View Post
'Burping' is when your tubeless tire wheel loses all of the air in it at once .. in , say , a sharp corner ..

Presta valve stems have a locknut , you break loose the sticking of the valve stem's check valve seat
after loosening that nut, by tapping on the shaft the little nut is attached to ..
Forgive my ignorance what I meant was that slight resistance on the first push of the pump when inflating dunlop valves, after that it goes smoothly.

Kret
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Old 04-22-19, 02:12 PM
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Originally Posted by krecik View Post
edit: sorry, it got all messed up during an edit.Hi, found this hose in a frame pump. It appears to be for Schrader valve, I have attached some photos. It doesn't seem to have a pushing pin of any kind inside so I thought maybe it pushes it in by the pressure it exerts during pumping so I tried it but it doesn't seem to push the air in.Any thoughts? How do you use it. Am I doing something wrong?ThanksKret
I remember these well, there should be a small bit of plastic in the shape of an X that sits inside the shrader end, they used to often fall out rendering it mostly useless really. But the good news is that the flexible ends are readily available very cheaply on the usual selling sites
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Old 04-22-19, 02:22 PM
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Originally Posted by cambiker71 View Post
I remember these well, there should be a small bit of plastic in the shape of an X that sits inside the shrader end, they used to often fall out rendering it mostly useless really. But the good news is that the flexible ends are readily available very cheaply on the usual selling sites
Oh, ok, I stand corrected then, there was something missing afterall. Thanks alot for the info! I'll buy another hose just to make the pump useful then.

The mystery was solved!!!

I say we let this thread die now

kret
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