Heating oil tank valve - what type is this?

[Rollerball]

Trying to find out what type of valve I have on my heating oil tank,
here's a grotty pic of it:

http://i59.photobucket.com/albums/g319/Dalek99999/valve.jpg

Any ideas please?

Also, as an aside, where the large hexagonal 'nut' (at the very rear
of the pic) goes into the tank itself - this had some moderate sized
rusty flakes on it which I've now removed. What can I do to prevent
this rusting any further? Spray it with WD40 perhaps ???

Or is a bit of rusting to be expected?

I want to avoid any possible leaks from that area in the future!

Thanks

 

[Burnerman]

It looks like an early Atkinson Tankmaster, I think.
As for the big hexagon, just keep it greased - but don't try to turn it!
John

 

[Rollerball]

Thanks John.

As for greasing the 'nut' ........... don't think that I have any grease, will vaseline do?

 

[Burnerman]

Yep, just give it a good layer.
John

 

[Rollerball]

Thanks again John - Vaseline it is then!

BTW, should I be 'neutralising' the existing rust on the large 'nut' in any way, or isn't that necessary?

 

[Burnerman]

By all means treat the nut if you want, but as its so big, corrosion won't be a major issue.
Remember, don't turn it!!
John

 

[Rollerball]

Ta - don't you worry, no turning will be involved.