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Old 30 May 2014, 13:42   #1
keg
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Tubes?

Evening everyone,

The questions continue.....

Went up to measure my SR4 for a cover yesterday evening and also check what type of valves are fitted so i can order the right pump and connector.

I pushed the valve in whilst checking to see if it was a push fit or Halkey Roberts like my Wetlineand let some pressure out. ( seems it's a push fit)

Going up again this evening, the tube seems even softer. It is being stored in a barn at the moment and it's quite cool in there. I assume this will make a difference. I also wonder if the valve is leaking as it's been fine since i collected it a week ago.

Do these valves stick?it seems strange that it's only changed since i touched it.

What pressure should the tubes be please? I know they need to be firm to the touch.

Thanks

Tim
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Old 31 May 2014, 17:40   #2
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Hi I have a SR4 (recently bought)
I am not sure about sticking valves but the air temp does make a lot of difference in the tube pressure,
I think the recommended pressure is shy of 3psi !!!
I currently have mine at 2 psi and they are pretty firm!
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Old 31 May 2014, 19:15   #3
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As the air cools, it gets more dense, which, assuming it's in a closed container, means less pressure.

jky
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Old 01 June 2014, 07:30   #4
keg
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Cheers for the replies everyone. I remember the pressure/temp changes from my schooldays ( a long time ago now...) The tube seemed softer than when i left it.

Pumped them up with me new pump yesterday so will see how they are by Friday.
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Old 10 June 2014, 05:46   #5
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Can you retrospectively fit 'non return valves'? When we remove the pump from the tube the air flows back out and if your not quick, back where you started.....
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Old 10 June 2014, 07:46   #6
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Have a good friend at Henshaw inlatable he is a great guy and always willing to help with advice etc. Give him a call. What he does not know about tubes is not worth knowing. Good luck Robert Walker (Bob)
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Old 10 June 2014, 07:47   #7
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Thanks Bob, I'll give him a call
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