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blow-cock
blow-cock n.
Brit. 
/ˈbləʊkɒk/
, /ˈbləʊkɒk/U.S. /ˈbloʊˌkɑk/
a cock or tap by which to blow off steam./ˈbloʊˌkɑk/ΘΚΠ
society > occupation and work > equipment > machine > machines which impart power > boiler > [noun] > parts of > device for blowing off steam
surface blow1857
blow-cock1885
1885 Standard 28 May 6/3 Joint of blowcock of boiler gave way.
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