I was looking on test certificates of FARRIS SAFETY VALVE MODEL NO. 1896M, which has bronze body, bonnet & SS stem, spring. Test certificates for body, bonnet & disc only provided by the manufacturer. That too, they have provided 3.1 certificate for body, bonnet & 2.1 certificate for disc. I could not find test certificate for stem & guide. This being safety valve, I am more concerned to get 3.1 certificates for stem, guide & spring. Also, 3.1 certificate for disc. Can any one suggest if my above argument is correct.
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