Hill DIN 200 fitting leak - Seal?

v76 · Post by **v76** » Tue May 20, 2014 2:35 pm

Just got the DIN 200 fitting for my Hill mk3 pump but it leaks between the pump and fitting (BSP 1/8"). I can't tighten it any more than it is and I can't see the fitting's threads so it looks seated alright. I can't pump past 100bar on my cylinder. It did not come with any sealing washer but I noticed there was a large rubber ring in the tools/accessories (doesn't look like a regular o-ring). Would I need a washer of some sort or do I need to actually put it in a vise and try to wrench it more with some teflon tape perhaps?

Gwhite · Post by **Gwhite** » Tue May 20, 2014 4:03 pm

I think you need a seal washer. This is a steel washer with an O-ring embedded in it.

Do a search on: 1/8" bsp bonded seal washer

Here's one: http://www.amazon.co.uk/Connect-31780-B ... B007SU9QQ4

v76 · Post by **v76** » Tue May 20, 2014 4:17 pm

Hi Doug, thanks for the reply. I looked these up before ordering the adapter and figured there would be no need, as Hill doesn't supply any with it. The Walther adapter that was on it had about 2mm of rubbery looking stuff on it.

For posterity: the adapter is 1/8" BSPP thread fitting and will need a bonded seal or o-ring.

I'll order a few from an ebay dealer (5$ all in all for 2) and try with some PTFE tape while waiting... Good thing I love dry firing.

Gwhite · Post by **Gwhite** » Tue May 20, 2014 8:28 pm

I think the BSPP is a straight thread. I'm not sure the teflon tape will do anything for you without a tapered thread. You could try an O-ring from the hardware store, but I suspect it may just blow-out at the pressures involved.

v76 · Post by **v76** » Tue May 20, 2014 9:50 pm

Yep, it is the BSP parallel fitting that requires an additional washer like the one you linked to. I'm dumbfounded that Hill doesn't even mention or supplies this required ring with the adapter.

Gwhite · Post by **Gwhite** » Wed May 21, 2014 4:33 pm

Mine came with one, but I ordered everything in one go from our sponsor.

Gerard · Post by **Gerard** » Wed May 21, 2014 8:09 pm

My Gehmann Fx pump came with a gauge which when fully tightened, turned its dial face towards the floor. The gauge uses a straight thread, so trying teflon tape didn't work to correct this as the tape was just sliced apart by turning it into place and it went just as far. I tried an O-ring but it became crushed and mangled very quickly, though it worked for a couple of months, then pressure started leaking from the gauge, as it receives full pressure same as the cylinder. I finally took the time to machine a thin delrin washer on my little lathe, found it was too thin, made another slightly thicker, and finally the gauge was facing more or less upwards so I could read it while being fully tightened. As with your Hill, a strange thing that it'd be shipped with the gauge but not working properly. So it goes with pumps I guess, but strange.

v76 · Post by **v76** » Wed May 21, 2014 8:32 pm

Gerard,
I think I've seen the "fiber washer" or something mentioned before about that type of fitting. You already know I deeply envy your technical skills and I wish I could make one myself. At least I got to try the new pistol: lots of 10s! I definitely don't regret abandoning the Morini.

The pump is a rebadged Hill pump and came stock fitted with a Walther 300 bar adapter. Figured it'd be a simple swap as it didn't have any dowty washer already, only some hardened rubber goo under the fitting. Bought the DIN 200 fitting from D&L and they also didn't mention I needed anything, until I sent them an email about it, which mirrored my inquiry with Hill.

Here is the correspondence I had with Hill:

"Many thanks for you email. I have spoken to our technical department. We do recommend that that adaptor is fitted to the end of the hose and not directly onto the pump, as it does not have a bonded seal. But this will seal to the taper on the end of the hose. Kind regards"

Seems very counter intuitive to attach such a big fitting to a hose rather than have a tapered fitting.

Gerard · Post by **Gerard** » Thu May 22, 2014 2:04 am

That explanation from Hill doesn't strike me as being very clearly worded. Side-stepping the issue it seems. I wonder how you're supposed to arrange such an awkward fitting on the end of the hose? Build a clamp of some sort to provide it some stability, perhaps clamping it to the pump body? Or perhaps I've misunderstood. But in any case, one has to wonder about the rationality and sense of responsibility of some folks...

Rover · Post by **Rover** » Thu May 22, 2014 10:24 am

Get a SCUBA tank!

deadeyedick · Post by **deadeyedick** » Fri May 23, 2014 2:42 am

Get a SCUBA tank!

Best advice you will be given IMHO .

Spencer · Post by **Spencer** » Fri May 23, 2014 3:40 am

Rover wrote:Get a SCUBA tank!

Somewhat surprised that Rover did not recommend a FWB65...

Rover · Post by **Rover** » Fri May 23, 2014 9:57 am

Spencer, I would probably would have, but this guy is determined to do things the hard way. (Heh, heh)

v76 · Post by **v76** » Fri May 23, 2014 12:09 pm

I sold my LP10 for a plane ticket to the Gran Paradiso mountain in Italy on my quest for a K58!

Rover · Post by **Rover** » Fri May 23, 2014 1:38 pm

Aah, my first love!

Spencer · Post by **Spencer** » Fri May 23, 2014 3:52 pm

Rover wrote:Spencer, I would probably would have, but this guy is determined to do things the hard way. (Heh, heh)

Air Pistol is not my favourite event (as my scores attest) but I will shoot it at a tournament if only to amuse my 'friends'. When travelling I take my AirMatch and avoid a lot of hassles.