safety valve springs

[Nigel HydeParticipant @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 !!

[Nigel HydeParticipant @nigelhyde97004]

[julian atkinsParticipant @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

[Nigel HydeParticipant @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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