Does anybody know how to take this apart? I still couldn't do it. It is from a Hasag. Thank you. Juan.
It looks like the check valve set up in a standard primus stove to me. The hole in the side not in the end is there a spring loaded plug that can be pushed back down towards the narrow end? if so i suspect it will unscrew where the large diameter thread stops try heat and quench a couple of times that will free it off pete
Thank you, I will try as suggested. Not a primus at all, different diameter threads, otherwise I would change it by a Primus valve. Juan.
Ah be careful with that. In HASAG lamps these are often screwed on with a left hand thread. That tends to make you try too hard to unscrew it the wrong way and you can break it. Try rocking it both ways and I bet it comes off left handed. ::Neil::
Hmmm!, That is possibly a disosable nrv,certainly Petromax had available in the twenties or thirties a disposable PBV , this may be a similar item , a thought. Rer
From the picture I am pretty sure that is a serviceable valve and it will be a left hand thread. I have seen a few now and they are always a problem because folk don't expect this odd thread. ::Neil::
I was out for a couple of days so I couldn't try but I guess is a not serviceable valve. It seems to be one piece.
I have recently serviced the valve on Juwel stove and found that it ws only the last 5mm or so that screwed off. Not right up where the threads are like on other valves. Maybe Hasag used something similar.
Nils did the Juwel have a way to put a wrench on? I see a joint or just a line closer to the rounded end? But no flats to get a wrench on.
It had the usual screwdriver slot at the end. I usually use an old drill chuck to hold the barell of the valve as I've had a couple where the end breaks off with a screwdriver.
Ah! Thanks for the idea; I tried to hold it with tweezers but I was afraid to deform it. I'll try right now again!
I tried with the chuck but nothing and, after a more accurated exam, I conclude that: Yes, it is serviceable but as the edge is deformed on the rounded edge (yes, Nagant: it is a line where most probably are the screw threads), I guess I wont be able to disassemble. And yes, if the valve have to be taken apart from its top end, it must be left hand tread, otherwise you would disassemble the valve when unscrewing it from the socket. Well, I'll put this scraped Hasag on the fridge for a while. Thanks anyway. Juan
I've got three Primus's (stoves) on the fridge right now! must be a western hemisphere thing . Maybe a long soak in solvent will cure that NRV. good luck!
I came across the same problem with my Aida lantern NRV that would leak at the pump. After much examination, I could not find an access to the spring, plunger and nib within. My last resort was to remove the hemisperical end, and gain access to the spring, plunger, and nib. As suspected, the nib was just crumbles. I replaced with a section from a #204 Viton o-ring, and then by drilling 2 holes of .035" diameter near the now open end, I fashioned a small piece of stainless springwire as a clip to retain all the bits. Works like a dream. Now, I can easily access the expendables and maintain.
As a last resort you can heat and quench these but you will destroy the spring by doing so. However a spring can be replaced so that is not a disaster. You do need to watch for that left had thread though. ::Neil::
