safety valve springs

This topic has 3 replies, 2 voices, and was last updated 10 November 2013 at 20:35 by Nigel Hyde.

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5 November 2013 at 22:15 #134720
Nigel Hyde
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@nigelhyde97004
Completed Conway's safety valve and now struggling to get a spring for it! Martin Evans states "trial and error". Any suggestions as to a source of spring,or,is it wind it myself ? From what gauge wire? Blow-off pressure is 80 PSI

here is the drawing, I have the full drawings and the articles from model engineer, please help as the loco is ready to steam !!
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5 November 2013 at 22:15 #1234
Nigel Hyde
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@nigelhyde97004
5 November 2013 at 22:59 #134722
julian atkins
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@julianatkins58923
strongly suggest you have a look at POLLY online catalogue (PDF download) and choose the appropriate gordon smith design. a 3/8" dia seat for a CONWAY as designed seems FAR too big to me! suggest you use gordon smith's 3/16" seat mild pop design. ive just made a safety valve to gordon smith's design (POLLY supply the springs and drawings etc) and has given excellent results on test.

ditch martin evans' design and make a new valve as above – martin evans' design is atrocious!

cheers,

julian
10 November 2013 at 20:35 #135179
Nigel Hyde
Participant
@nigelhyde97004
Hi Julian

thanks for the message, i think you could have a point, i will make one of the Gordon Smith types, i have a pair on my simplex and they work great

polly here i come!

thanks again

Nigel
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safety valve springs

safety valve springs

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