Wired tube fittings 1

[Siddharth Zaveri]

How do we insert wire under swivel nut? What is the process called and can it be done manually or a specific machinery would be required?

I am also attaching a picture of such fitting for your understanding.

Thanks in advance!

 

[btrueblood]

I'm not sure that's a safety wire hole, if that's what you are asking? Some types of tube fitting nuts have a weep hole to allow for checking leakage past the sealing element (ferrule, swage, gasket/oring etc.)

If you really do need positive locking on B-nuts, see

http://www.moelleraircraft.com/lockwir1.htm

 

[LittleInch]

That looks like a bleed or weep hole to me. Don't think you're supposed to stick anything in it...

Do you have a link or name of this fitting?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Siddharth Zaveri]

Thank you for your replies. Actually we want to insert wire in nut hole at 45degree from top of its hex to enable it to hold on to the adaptor. So wire will help to retain nut on adaptor and can swivel on adaptor.

 

[btrueblood]

Now I'm confused. Can you sketch what you are trying to do? The hole you showed isn't oriented like what you are talking about. And the B nut you showed is probably already permanently retained to the fitting, so not clear what other retention is needed? Drilling holes for lockwire through a B-nut is tricky, because there isn't a lot of meat on the corners of the nut, like there is with a standard threaded fastener nut.

 

[mk3223]

Is it similar to the chained cap to be tied on the object?

 

[Siddharth Zaveri]

Please see the attachment with this post. I hope this clears your doubts.

 

[XL83NL]

Isn’t the wire useless since the nut cant come of anyway? As LI said, it’s probably a weep hole. I think a wire may actually cause problems with nut rotation, therefore preventing proper installation.

 

[hydtools]

I would expect a manufacturer of swivel nut fittings uses a custom machine to insert the swivel retaining spring wire to retain the nut to the fitting body. The resulting assembly is permanent, non-repairable.
A precut length of spring wire would be pushed through the hole into the grooves of the fitting body and nut retaining the nut to the body. The result being a rotation joint.

Ted

 

[LittleInch]

You say you want to"retain it", but it doesn't come off the fitting.

This is a high pressure fitting (315 bar)!!. Don't mess with it.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[moltenmetal]

I have a dusty recollection of some AVIATION hydraulic fittings which had wires through the nuts for the purpose of installing a seal to indicate that they'd been tightened. I don't have a manufacturer much less a picture.

Weep holes in the nuts of face seal rather than ferrule-type compression fittings are standard. But they're generally drilled in the centre of the face and not at an angle, and certainly not two holes in a line that you can see light through. The latter arrangement would indicate their use for installing a wire which can only be inserted after the fitting is tightened up, and which must be removed before the nut can be loosened, i.e. a security seal.

 

[hydtools]

Safety wire or lockwire was used to prevent loosening of fasteners. Not retaining a swivel nut to a fitting body which is what I think the OP was asking about.

https://en.m.wikipedia.org/wiki/Safety_wire

Ted

 

[moltenmetal]

Safety wire or lock-wire can also be used to identify systems that have been disassembled as part of maintenance, and provides a check or certification that the parts have been properly tightened. A wire which must be removed before a fitting nut can be slackened off wouldn't be a particularly effective way to prevent spontaneous disassembly, but might form part of a mechanic's checklist procedure- after you tighten each fitting, you install a new wire and lead seal.

 

[danw2]

FYI for the readers,

I have dealt with conventional compression fittings in the process industries for ages but had not run across a wire seal option. So I googled Parker tube fitting wire seal and discovered a fairly new option that's an alternative to a wire seal.

For what it's worth . . . .

 

[hydtools]

Siddharth is asking about installing the wire to create the internal swivel shoulder. Everyone is carrying on with nut-locking conversation. Anyone know how to insert that wire to create the swivel internal shoulder?

Ted

 

[btrueblood]

I'd use an internal retaining ring. Or, for high pressure fittings, swage the nut on, like the big guys do (Parker, Eaton...).

But drilling, with a jig to hold the part and a hardened drill bushing would be the way to go if you just "have to" use wire. This assumes a circular groove pre-machined on the internal part. Then assemble with a straight wire and peen or tack weld the ends. It won't hold nearly as much pressure as other methods, see above.

 

[hydtools]

Parker Ermeto line has an inserted ring for the swivel shoulder. Fittings are rated to 800bar.

https://ph.parker.com/us/en/ermeto-din-swivel-to-swivel-hydraulic-tube-fittings

Ted