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Martin Evans Midland Single

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Martin Evans Midland Single

Home › Forums › Help and Assistance! (Offered or Wanted) › Martin Evans Midland Single

Viewing 9 posts - 1 through 9 (of 9 total)
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  • 30 January 2022 at 11:52 #583050
    Brian H
    Participant
      @brianh50089

      In the Martin Evans Midland single there are 2 injectors, one of which has a combined clack for both the injector and the pump.

      The drawings give no dimensions.

      Does anyone have dimensions for this?

      Brian

      30 January 2022 at 11:52 #33958
      Brian H
      Participant
        @brianh50089
        30 January 2022 at 12:35 #583072
        Clive Brown 1
        Participant
          @clivebrown1

          For "Princess of Wales" Martin Evans gives the dimensions of 2 clacks for the boiler backhead. They're on p436 of ME 7th. May 1971. There's nothing else AFAIK apart from 2 injector steam valves shown on the steam manfold. I don't recall any mention at all of a pump, builders are on their own. I'm not quite that far with my build.

          31 January 2022 at 07:53 #583235
          Brian H
          Participant
            @brianh50089

            Many thanks for the reply Clive, If I find any further information I'll be sure to let you know. I'm just wondering how the boiler is filled before a steam-up.

            Brian

            31 January 2022 at 09:03 #583241
            Former Member
            Participant
              @formermember12892

              [This posting has been removed]

              5 February 2022 at 09:01 #583941
              Brian H
              Participant
                @brianh50089

                Hello Bill, I've only just seen your reply and I'm sure you are right but this isn't my engine. Martin Evans mentions a drawing but says that he is not going to describe it as he has done it many times before and that's the problem; trying to find where he described it before.

                As I understand it, there is a combined clack on the boiler for a hand pump and injector and the engine builder would like a drawing so that he can make it.

                Brian

                5 February 2022 at 10:00 #583956
                Clive Brown 1
                Participant
                  @clivebrown1

                  I've just re-read Martin Evans build notes. As said, he mentions providing a drawing but doesn't do so. However, googling "double clack" produced a thread on this forum with an outline design which should be useful here

                  5 February 2022 at 11:12 #583968
                  Clive Brown 1
                  Participant
                    @clivebrown1

                    Too late to edit my post above, but Martin Evans does show a pipework sketch with a double check valve separate from the boiler clack. This implies that the injector has to feed through two check valves in series, which might not be a good thing. The appearance of the backhead would be more "scale" though.

                    There is no detail in the Evans sketch and I'm not aware of any published design for a double check valve that is not boiler mounted and would suit this arrangement.

                    Edited By Clive Brown 1 on 05/02/2022 11:16:10

                    5 February 2022 at 18:09 #584020
                    Brian H
                    Participant
                      @brianh50089

                      Many thanks Clive, I've passed the details on to the builder.

                      I've been trying to find out details of the check valve that Martin Evans says he is not going to describe on the grounds that he had described them many times before.

                      Brian

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