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Old 06 April 2009, 05:02   #1
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Re:A4 valves

I am going to have to replace the A4 valves in my Avon.

So I have discussed the valve situation with a couple of suppliers,and they have said that the easiest way to remove the valves,is to heat them up with a heat gun.
Obviously they are the experts but has anyone on here actually done this ?
Doesnt it burn the hypalon ?

Any advice please

MIke
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Old 06 April 2009, 05:19   #2
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Its fairly simple, just take you time heat up slowly and evenly around the valve and keep an eye on the material that surrounds the valve to make sure you donít over heat and cause bubbling. You are going to be covering up the few inches around the old valve anyway if you are fitting the new ones on a doubler patch.

Good luck
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Old 06 April 2009, 11:51   #3
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Mike;

I'm guessing the advice given you was to remove the donut of material the valve is mounted to, and not just to remove and replace the valve alone.

Just want to make sure you know what you're getting into: Remove the valve and donut (hypalon circle with the valve cutout), glue in new donut with new valve attached.

This is not, I think, a matter of unscrewing the old valve and screwing a new one in. The valve retaining ring does not fit through the opening for the valve, hence the donut.

jky
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Old 29 August 2009, 09:25   #4
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A4 valve replacement

I'm also planning on replacing some A4 valves in a couple of old Redcrests I have. Is just using an outside donut patch sufficient, or does an internal patch need to be used as well?

I'll be putting in new C7 valves.
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Old 29 August 2009, 10:43   #5
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The outside patch is fine, if you want a price for shipping to the states just drop me an email
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Old 30 August 2009, 17:23   #6
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whats wrong with the valves you have mike, its a lot easier to fit new seals and stems to your old valves than replace with new ones, where are they leaking from?
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Old 12 September 2011, 11:57   #7
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How did the valve replacement work out. I am in the same situation. 1972 redcrest with shot diaphragms. I am going to replace the a4 with the c7.
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Old 12 September 2011, 16:37   #8
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I've just done the same on an old Avon, replaced the A4's with C7's.

New valves supplied with ready made doubler patches from Ribshop. They do a kit with most things you need, glue etc.

In addition you'll need a heat gun to warm up the old patch, it'll then peel off quite easily. The hole that's left needs to be opened up slightly larger to accommodate the new valve. You might want some kind of power tool to remove all the old glue and bits of valve that get left behind, the little piece of sandpaper that comes in the kit will require patience and elbow grease, not supplied
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Old 12 September 2011, 17:01   #9
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How did you prevent the glue sticking both halves of the tubes together? And I assume you just cut around the existing valve first hey.
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