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Safety Valves

Home › Forums › Beginners questions › Safety Valves

Viewing 10 posts - 1 through 10 (of 10 total)
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  • 2 March 2014 at 16:47 #7059
    Deltic007
    Participant
      @deltic007
      2 March 2014 at 16:47 #145728
      Deltic007
      Participant
        @deltic007

        Hi all

        I am changing the safety valve on my 3 1/2 lilla locomotive from the sprung cartridge arm type,question is what is recommended for a boiler on a 3 1/2g loco to give enough pressure drop and what particular type is best suited.

        Or do i need 2 valves?

        Thanks

        2 March 2014 at 21:41 #145762
        nigel jones 5
        Participant
          @nigeljones5

          Off the top of my head (which is what I build to!) a 3/16 hole with a 1/4 ball and spring will be more than plenty.

          2 March 2014 at 22:05 #145765
          Deltic007
          Participant
            @deltic007

            Thanks Fizz

            3 March 2014 at 00:11 #145782
            nigel jones 5
            Participant
              @nigeljones5

              Infact possibly very excessive! This would be better suited to a 5" scale, down size!

              3 March 2014 at 09:03 #145797
              Steambuff
              Participant
                @steambuff

                Fizzy,

                Remember that the 3 1/2" Lilla is as big as some 5" loco's (If not bigger, due to it being a narrow gauge loco)

                Dave

                .

                3 March 2014 at 23:00 #145897
                julian atkins
                Participant
                  @julianatkins58923

                  hi deltic,

                  can recommend you look at Polly online catalogue and choose a suitable Gordon Smith safety valve and spring and drawings etc.

                  far superior than anything else and will easily satisfy the 'accumulation' test.

                  cheers,

                  julian

                  4 March 2014 at 06:58 #145910
                  Deltic007
                  Participant
                    @deltic007

                    Yes I have seen the Polly ones

                    question is which one is suitable??

                    4 March 2014 at 08:47 #145923
                    julian atkins
                    Participant
                      @julianatkins58923

                      i would suggest SV#4

                      i have no connection with Polly other than being a satisfied customer

                      cheers,

                      julian

                      4 March 2014 at 09:59 #145935
                      Deltic007
                      Participant
                        @deltic007

                        Thanks julian

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