Thicker Plastic Washer for WIKA Regulator Gauge of FX Impact

[Bonzai]

Need help on where to purchase the plastic washer to use for my FX Impact using the WIKA gauge. I installed the oversized magazine sold by Utah Airguns and now the Wika gauge in the regulator is bottoming out due to the thicker plate. It is now leaking air. I think it needs a thicker plastic washer.

 

[BigTinBoat]

I'd check a local hydraulic store. a Dowty washer should work.

BSP Bonded Seals[/QUOTE]http://www.parkerhydraulics.co.uk/hydraulics/bonded-seals/bsp-bonded-seals/embed/

 

[Brian10956]

Why not try an oring on top of the washer

 

[Bonzai]

Thank you Guys. I have an extra o-ring and try that first.

 

[BigTinBoat]

"Bonzai"Thank you Guys. I have an extra o-ring and try that first.

If using an o-ring be sure the OD is as close to the threads as possible, and with the smallest ID as possible. I think O-rings in pressure situations are actually meant to be contained with-in a "groove" for proper seal. With high pressure there is nothing preventing the ID of the o-ring from moving inward as the pressure attempts to get by the sides of the o-ring, thus allowing it to "get by" and leak.

 

[Bonzai]

BigTinBoat, thank you for the advice about the o-ring size.

 

[socaloldman]

It's these great little tidbits of information that we glean frm conversations that make this such a great forum. Thanks Bigtinboat I'll file that one away for future use! 

 

[jking]

Agree with BTB, after I added the second regulated pressure gauge to my Royale I had some trouble getting it to seal even with a home made delrin washer dropped in first. I tried a loose fitting O-ring and that didn't seal 100%. I pulled that O-ring and found one I had to work to the bottom as it fit really snug against the threads. Wallaw, it work and sealed 100%.
JK

 

[Brian10956]

In some case were a oring will not hold a x ring can give positive results as you have 4 sealing edges instead of 1. I use to make underwater video camera cases and that all we used.

 

[BigTinBoat]

Ideally this is what you want the bottom of gauge to look like. If you could put the gauge in a lathe and cut the ends of threads like this, it would stop the o-ring from moving when under pressure. I think a small washer the OD the same as o-ring ID, just slightly thinner then the o-ring, would work also.
This is a Benjamin gauge port adapter.

 

[Brian10956]

One other way to use orings in a similar situation is to use 2 or even 3 that are concentric with the outer one being the maximum size that will fit In a threaded hole, the outer one can be damaged by the pressure pushing it against the thread so check it occasionally. When I was doing the camera housings we were in remote areas where there wasn’t a near by store and we quickly learned to improvise.Remember to use silicone grease on the rings it will make them more effective and the drying out will be delayed.

 

[Drumsnguns]

i had the same problem with my Huma gauge. I called FX USA and got a couple washers specifically for the gauge. From the schematic it is item 34-B or part number 19723.

it did not seal on this hard plastic washer so I tried a #5 o-ring and that did the trick. I'd order two just in case. not sure of your needed depth.

KP

 

[Bonzai]

I did some measurements of the gauge hole for the regulator. It is:
Diameter - 8.7 mm
Thickness of washer should be 6 mm or more for WiKA gauge not to bottom out.
Hope this will help where to get this size of o-ring or plastic washer.

 

[Drumsnguns]

I wanted to add that I tried o-rings first but could never get it to seal so that's when i go the plastic washer from FX. They are quite thick. Something like .5-1mm? Give or take. One of those plus the # 5 o-ring did the trick. That # 5 o-ring might not be the perfect size for it but it's working. i'll try and get a more precise one soon.

 

[Hande]

FYI: There is no more plastic washer in the Impact MKII PP. It is X-ring 3,63 x 2,62 NBR 70, part B34, number: 19762