Jayvee2003

Doesn't the valve just un-bolt from the outlet of the tank? It looks like a Saunders ball valve. Not sure of the size of the valve in your case, but here's a link to an 1.1/2" one on-line and a table of sizes. Saunders Ball Valve 1 1/2″ - WG Tanker

Hi Steve, I think the Tanfield Railway was built around 1725, not 1925 🙂. Love your updates on here, always interesting 👍 Jon

A couple of them look a little like industrial 110v plugs and sockets. We use them in work on extension leads etc, I think the manufacturer was Hubble.

Elsewhere in the original thread, Robert discusses other possibilities. I think one involves a remote pump as gritineye recalls.

Thanks for taking the time to change all the links to your pictures. Without them it's just not the same.

Hopefully the previous is the post you were after. Page 22 of Scammell workarounds and fixes. Always found Robert Crowther's posts to be entertaining and interesting. A pity he's not been on the forum since 2017.

I work in the steel industry and we used hundreds of these valves in different sizes on an electroplating line I was involved in maintaining. There were two main designs, the "A" type (also known as the weir type) as here, and the "KB" type which was a "straight through" design. The diaphragms come in different compounds depending on the application and what substance the valve would be in contact with (water, acids, alkali, oils etc) and the grade was identified by a letter on the small tab sticking out of the side of the diaphragm. It might be worth checking prices for alternative grades of diaphragm (there are tables available online from various industrial pipe & valve suppliers). There may be a cheaper spare available; if I remember correctly a "Q" grade was suitable for water only but was much cheaper than the chemical resistant grades we had to use, since I doubt you will ever be filling the compartments with fuel again (although since the price of fuel has dropped in the current crisis, it might be worth stockpiling some). Thanks for posting the restoration of your Militant's on here. I've followed them with great interest. Jon