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scott(at)s-f-x.com
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 Posted: Thu Oct 31, 2013 12:29 pm Post subject: Drain valves |
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Hello
I have removed a SAF CAV 180 drain valve from one of my wing tanks and wished to replace it with a Curtis 1550 lockable unit which is 1/8 NPT thread. The left tank was updated like this and I was told the 1/8 thread went straight in and sealed but I can't get the right side to bite - I realise the thread on the SAF is 3/8 24tpi -3 which is parallel and a similar diameter but different thread pitch. I'm unclear if the SAF valve removed from the other side was in fact a 1/8 NPT version as these are available and I'm unlucky to have a rogue thread on the other side. I tried replacing the SAF 180 but it went in nicely but keeps spinning as the thread bottoms out - it would seem it has gone past the threads or something is loose !
Just wondering what you guys have - anything other than 1/8NPT ?
Also I have the caps with the Zeus type slotted screw to close/lock - are there any items that will retro fit with a tab or something easier than using a screwdriver to grip the wire ?
Thanks
Scott MacIntyre
G-BUZB
23 Mellor Road
New Mills
Derbyshire
SK22 4DP
UK
UK Mobile: +44 7860 208432
US Mobile: +1 (818) 397-0666
Email: scott(at)s-f-x.com (scott(at)s-f-x.com)
[quote][b]
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ccoulter(at)wavecable.com
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| Posted: Fri Nov 01, 2013 10:04 am Post subject: Drain valves |
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Mine are I/8th. Clarke
On Thu, 31 Oct 2013 20:27:32 +0000
Scott MacIntyre <scott(at)s-f-x.com> wrote:
| Quote: | Hello
I have removed a SAF CAV 180 drain valve from one of my
wing tanks and wished to replace it with a Curtis 1550
lockable unit which is 1/8 NPT thread. The left tank was
updated like this and I was told the 1/8 thread went
straight in and sealed but I can't get the right side to
bite - I realise the thread on the SAF is 3/8 24tpi -3
which is parallel and a similar diameter but different
thread pitch. I'm unclear if the SAF valve removed from
the other side was in fact a 1/8 NPT version as these
are available and I'm unlucky to have a rogue thread on
the other side. I tried replacing the SAF 180 but it went
in nicely but keeps spinning as the thread bottoms out -
it would seem it has gone past the threads or something
is loose !
Just wondering what you guys have - anything other than
1/8NPT ?
Also I have the caps with the Zeus type slotted screw to
close/lock - are there any items that will retro fit
with a tab or something easier than using a screwdriver
to grip the wire ?
Thanks
Scott MacIntyre
G-BUZB
23 Mellor Road
New Mills
Derbyshire
SK22 4DP
UK
UK Mobile: +44 7860 208432
US Mobile: +1 (818) 397-0666
Email: scott(at)s-f-x.com
|
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scott(at)s-f-x.com
Guest
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| Posted: Fri Nov 01, 2013 1:53 pm Post subject: Drain valves |
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It looks like the skin is about 1/4 inch, 6mm thick with very shallow threads - I ran a tap into it and got a 1/8NPT seal now. There seemed to be a sandwich of rubber or composite between the alu skins - are the wing tanks not supposed to have a boss with a proper threaded hole ? I can't find anything in the manual but I'm flying again now !
Scott MacIntyre
UK +44 7860 208432
US +1 (818) 397 0666
scott(at)s-f-x.com
| Quote: | On 1 Nov 2013, at 18:03, "HUGH COULTER" <ccoulter(at)wavecable.com> wrote:
Mine are I/8th. Clarke
On Thu, 31 Oct 2013 20:27:32 +0000
Scott MacIntyre <scott(at)s-f-x.com> wrote:
> Hello
> I have removed a SAF CAV 180 drain valve from one of my wing tanks and wished to replace it with a Curtis 1550 lockable unit which is 1/8 NPT thread. The left tank was updated like this and I was told the 1/8 thread went straight in and sealed but I can't get the right side to bite - I realise the thread on the SAF is 3/8 24tpi -3 which is parallel and a similar diameter but different thread pitch. I'm unclear if the SAF valve removed from the other side was in fact a 1/8 NPT version as these are available and I'm unlucky to have a rogue thread on the other side. I tried replacing the SAF 180 but it went in nicely but keeps spinning as the thread bottoms out - it would seem it has gone past the threads or something is loose !
> Just wondering what you guys have - anything other than 1/8NPT ?
> Also I have the caps with the Zeus type slotted screw to close/lock - are there any items that will retro fit with a tab or something easier than using a screwdriver to grip the wire ?
> Thanks
> Scott MacIntyre
> G-BUZB
> 23 Mellor Road
> New Mills
> Derbyshire
> SK22 4DP
> UK
> UK Mobile: +44 7860 208432
> US Mobile: +1 (818) 397-0666
> Email: scott(at)s-f-x.com
|
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