Taper plug valves

Discussion in 'Identification' started by robint, Oct 18, 2012.

  1. robint

    robint New Member

    Has anyone found a successful way to grease the plug so it works for hot water (I guess water pump grease would do?) or more difficult, petrol. These valves become very sticky without grease and ordinary grease will just run out or dissolve over time. Problem also with this valves, for water drain valve use, is that any leakage goes all over the spring and corrodes it.

    The grease, if thick enough will also help to create a seal

    Any ideas :roll:

    Cheers

    Robin
     
  2. petternut

    petternut Administrator

    Never found a grease that works and suspect the idea is flawed. If necessary I lap them in with metal polish using a reciprocating motion.
    In use I always tap lightly to tighten or loosen before and after opening or closing. Simple and works for me.
    I do the same with the larger water tank three way valves though in their case I find a very light smear of Silicone works wonders for both sealing and ease of opening or closing. Clean and renew frequently.

    As our Transatlantic cousins are wont to say: "your mileagae may vary"

    Roland
     
  3. robint

    robint New Member


    Hi roland
    If you look at the 3 way plug valve it has a blind well and its difficult to tap the bottom of the valve to open it. It spurred my enquiry as it was completely jammed and needed disassembly. Also its very easy in twisting to scar the valve surface. I am working on a source of petroleum proof grease (v expensive).
    Its odd that cork was he favoured sealing material of old

    Silicone is fine for cold water service but would leach away after a while under hot water as in a water jacket drain valve

    All good stuff

    Cheers

    Robin
     
  4. petternut

    petternut Administrator

    Sorry I didn't cover the 3 way. The 3 way in your pic appears to have a non-original and wholly excessive spring for the large contact area. A slight pull or lever away will allow a tiny amount of fuel between the surfaces and provides enough lube for one operation.
    I have used the silicone sealant on three way cooling tank cocks for some years. The hot water has no more effect on it there than in my shower tray.
    Why is cork odd? As long as its kept wet it works fine.

    I don't have a Lister 3 way to hand. Does anyone have one and be willing to dismantle and picture the spring? My recollection is of a weakish spring washer.

    cheeerrs
    Roland
     
  5. robint

    robint New Member

    Hi Roland
    This is a 3 way petrol/paraffin changeover believed to be from a Ruston parent, not an original lister dk 3 way which are as rare as hen's gold teeth, but it will do pro temp, and is probably equally rare in the Ruston community.

    I have an experimental sealant in progress and will report back in a few weeks

    This is the kind of thing that needs to be written up on the 50 Shed's of Grey blog.

    Cheers

    Robin :lol:
     
  6. petternut

    petternut Administrator

    Bought in from Rotherhams. Used by Lister but not Ruston.

    ttfn
    Roland
     
  7. campingstoveman

    campingstoveman Active Member

    Robin,

    I totally disagree with your comment about silicon sealant, my day job has me building very large walk in industrial washing machines, the machines parts have to pass through a standard door way so come in kit form, we then assemble the wash area from several flat panels which are sealed with Silicon sealant. The customer wash cycle is 55 Deg C and the rinse cycle is 82 Deg C and in factory testing they are run up to 95 Deg C. In the ten years I have worked from my company one machine leaked because the customer was washing products which had been soaked in chlorine which will degrade silicon.

    Martin P
     
  8. robint

    robint New Member

    Hi Martin

    Are we talking about the same stuff?

    Silicone sealant, white stuff in a tube and dispenser spread around kitchen and bathroom joints?
    available in Wickes and all bad plumbers?

    We are talking about grease for plug valves?

    Cheers

    Robin
     
  9. campingstoveman

    campingstoveman Active Member

    Robin,

    I am yes as roland mentioned it in his post but again we lubricate our gate valves on the machines with silicon grease with similar temperatures, ordinary greases affect the rubber sealsand then when they get hot the grease runs.

    Martin P
     
  10. robint

    robint New Member

    Sorry show my ignorance
    Who is Rotherhams?

    Robin :?:
     
  11. Numpty1

    Numpty1 Member

  12. robint

    robint New Member

    Fantastic, pardon my ignorance, but we are here to learn :roll:

    There it is, Lister fuel tank tap, Grease cap, and the infamous 1/4 solder nipple cone seat fitting

    Do any of their old factory drawings still exist?
     
  13. Numpty1

    Numpty1 Member

    Robin, So far Myself and Roland have linked Rotherham components to several engine manufacturers both large and small. For the bigger companies, Rotherhams supplied their parts unmarked (except at times of short supply?) with smaller companies buying in components marked either R*S or Rotherhams, most probably from a trade catalogue/advertisement. That is as far as I know. Should you wish to research more, we would be interested in your findings.

    Mark

    PS, a note on postings, I would post a link rather than using someone elses picture unless you are quite certain you have permission or there is no copyright (also saves bandwidth). I note that you are using a photo taken from David Edgingtons excellent Lister D history as your avatar. Which is fine if you have permission to use it.
     
  14. robint

    robint New Member

    Cheers guys point taken, I know this copyright thing is a touchy subject, just get carried away with the hope that one day my Lister D will be like that - the book is excellent btw :wink:
     
  15. robint

    robint New Member

    Just been out in the horrible weather to check the 3 way valve. It is stamped "EW" on the neck and it looks like a rough sand casting
    Does this mean anything?

    Cheers
    Robin
     
  16. Numpty1

    Numpty1 Member

    Robin,

    This is a standard Ruston tap made by Rotherhams as fitted to PB, PT etc. and the twiddly bits look identical to your 3 way tap.

    [​IMG]

    Here is the R*S logo stamped in the hexagon.

    [​IMG]

    ...and this is presumably a part number, so your EW could be the part number for your tap.

    [​IMG]
     
  17. robint

    robint New Member

    Nice photo's I must try harder, how did you get such good close ups? do you have a special light box?. Does that extended shank hold a filter gauze?

    The handle looks the same, and it looks like a sand casting. I would have stamped them out of brass strip, one operation, then punch/broach the square hole. I wouldnt have turned up the thumb part, extra work, cost more, not necessary. Maybe for a short run of 100 or 2 say, wouldnt justify the tooling cost? I worked in a non ferrous foundry as an apprentice, fascinating, playing sand castles and making moulds and cores

    Cheers

    Robin :p
     

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