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Inverted slide valves

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Inverted slide valves

Home › Forums › Locomotives › Inverted slide valves

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 3 October 2023 at 19:53 #2226
    John Billard 1
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      @johnbillard1
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      3 October 2023 at 19:53 #662727
      John Billard 1
      Participant
        @johnbillard1

        Does anyone have any experience of putting a spring below an inverted slide valve to ensure its contact with the valve face?

        Best wishes

        John B

        3 October 2023 at 21:28 #662746
        Anonymous

          Not directly, but I have designed the LP valve on my compound traction engine so that it uses a simple flat leaf spring to keep the valve in contact with the valve face. The design is based on the full size valve.

          Andrew

          Edited By Andrew Johnston on 03/10/2023 21:31:19

          3 October 2023 at 22:04 #662753
          John Billard 1
          Participant
            @johnbillard1

            Thanks Andrew. That's interesting.

            How is the spring attached?

            John B

            3 October 2023 at 22:15 #662756
            Paul Lousick
            Participant
              @paullousick59116

              Similar to Andrew, The slide valve on my Ruston TE has a slide valve on the side which kept falling off and not sealing when steam was shut off. Then bang back on when turned on.

              A simple flat leaf string attached to the back of the slide valve (made from "Band-it" steel strapping) and rubs against the back of the cover plate fixed the problem. Very little force is required to hold the valve, just enough to keep it seated.

              slide valve spring.jpg

              Edited By Paul Lousick on 03/10/2023 22:19:05

              3 October 2023 at 22:16 #662757
              Redsetter
              Participant
                @redsetter

                My only experience of this was with a 5" Pansy with valves below the cylinders. On starting, there was a short delay after opening the regulator until the steam chest pressure increased enough to lift the valves up, and you could usually hear a click when this happened. You could induce this by snapping the regulator open, then backing it off to the starting position. It really wasn't a problem once you knew about it.

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