Hi guys, I got a ex-swiss army lamp kit last weekend. I tried to light up the 827B, by one Geniol it worked, but by the other Petromax the pump bottom ventil did not close perfectly so I took out the ventil. It looks completely others than the normal ventils as we can see on the HK500 or any other Petromax. It seemed to be a whole piece, the rubber seal and spring can by no way dismantled from the bronz housing. I took some photos for it together with an ordinary ventil from my 829B HK500. And the shape of the head is also different so that the normal ventil does not work properly in the 827B. Later I destroyed the ventil to see if there was a second screw, nope, it was really a one-piece part. Now I don't have any backup solution but looking for another part. Any ideas where I can get the same ventils? Thanks!
Hi Willi, No it doesn't fit. The thread has the same size but the shorter one has a countersink head, the new style is flat head, so it doesn't close at all.
No, I have a new Ventil with the lead washer, but it didn't work at all. Even I tried to put a O- Ring from Viton, the shape of the head is quite different.
@luke1990 , welcome to the forum. Please check f there is an old seal stuck in the bottom of the pump tube. The length of the thread doesn't influence the fit. The size does but that should be the same.
Hi, Thanks a lot for your reply. Actually the old lead washer was on the ventil and I removed it before I took the picture in order to see the difference better. The problem here is only caused by the shape of the ventil, the new type has a flat head, but the old one has a conical head, so if I install the new type ventil it does not seal the pump tube at all, although the thread has the same size. I did not find any information about this strange ventil, maybe I shoud try again with my new type ventil.
That non-return valve or 'ventil' is not easy to come by. And its non-serviceable too. I'd say it'd be better to machine out the upper part with the conical seat but make it sort of a hybrid with a threaded end that could be used with a regular lower tube.
Hi, I think that was a totally dumb design, and I have already cracked it by trying to dismantle it. I do not have the ability to machine out the valve, so I guess what I can do is further trying to use the new type of valve or wait till someday the same valve apears somewhere...
In that case you might want to try using a thicker HDPE sealing washer(punched out from a thicker-walled container) with a regular non-return valve. The HDPE is soft enough to deform and follow a conical profile if tightened down sufficiently. Its very fuel-resistant too. If you're lucky, it might just seal and you'd have a working lantern soon. A little cruder, some fuel-resistant thread sealers or even some PTFE tape might do the trick without needing to tighten the ventil all the way.
Thanks a lot for these warm tips! Yes I will definitely try all the possibilities as you said. Maybe the viton O-ring was just too soft and too elastic so by tightening it just slipped over the threads. And the lead o-ring was not soft enough to deform. Thanks again! I will report if it works!
It works!!! I tried to wind Teflon tape on the thread and then put the lead washer at the end, it didn't seal at the first time. I dismantled the valve, the rubber bib was the problem! Then I renewed the rubber bib and screwed it again, it works perfectly!!! Thanks MYN! My lantern works again
Congratulations @luke1990 . At least temporarily, PTFE tape should be fine. Perhaps someday you'd find an original ventil with the conical mating surface.
