Please - help. I have MEWA lamp. NRV is rusty and does not get any air through, so it has to be removed and replaced or fixed. Problem is that the valve keep turning without getting out. It turns around together with the press-nut that is inside the tube. OK, i can glue it somehow not to leak pressure, but it still be solid without any chance to pump it. Any advice?
Sometimes those valves get stuck due to the lead seal. Or dirt. Or both. I have made a small hook at the end of a piece of metal wire. With some patience and luck you can then get pass it and hook the piece out. I am not sure what you want to glue to repair it from leaking.
Hello.. do you mean that the thread soldered into the base of the pump tube has broken free? And the nrv is still locked to it? If so then you may be able to unsolder the tube from where it joins the tank? Other folk on here have done that and should be able to advise? Good luck with things
Exactly. But tank is very nice painted Actually it seems to be not the whole bottom of the tube, just the ring into which is valve crewed and tightened
@DittmannCz Give the inside of the fount a good clean. A buildup of dirt and fuel residue on the NRV can stop it coming out.
I use the air pump and compressor if the NRV will not come out after it is loosened in the thread. Be careful when pumping air into the tank, NRV comes out at very high speed, and can do damage to people and loose objects. Make sure the opening of the pump hose is facing away, both from yourself and others. I have attached some photos. Tom
Actually problem is that it cannot be tightened too, the hole base is loose Lamp is other way in great shape...
@DittmannCz , hi there, I had a similar situation, read my post in the lantern reference gallery, there may answers to your issue and a how to fix it. My NRV didn’t budge, I in soldered the tube Hope this helps
Hi @DittmannCz It does seem hard when the paint is original.. Are there any markings on the base of the tank/fount? Underneath ?
Nice ! What I mean, is that if you have to strip the paint to unsolder the tube, then you can protect the original paint on the base? Then use that as a guide for re-painting the tank? If there were decals on the side of the tank then things are more difficult or if the tank was plated the heating can also affect it? It will probably be soft solder holding it in so not much heating required?
no decals on side, still have no clue how to desolder it. never done it before... use the flame? any guide?
This is really a pity, because the paint around the tube will certainly be damaged during desoldering and will have to be repainted. But at VEB Leipziger Werke / Leuchtenbau they apparently used aluminum washers as seals for the NRVs. I also have some tanks here where I didn't manage to get the NRVs out intact. So I decided to solder out the pump tubes as well. For this I used a heat gun instead of a soldering torch, so that the heat can be dosed better, which is especially important when re-soldering the tube. I must admit that this requires some experience, so it is best to try this first with an old spare tank from a donor lantern.
Hello @DittmannCz .. perhaps there is someone on the forum who may be prepared to help with the work and is not too far a distance away ?? Hope you manage to resolve things Regards pb
If you don't know how, if you have have never done it before: put the lantern on a shelf and don't ruin it. Find another tank with pump shaft and learn on that one.
