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pop valve
pop valve n.
Brit. 
/ˈpɒp valv/
, /ˈpɒp valv/U.S. /ˈpɑp ˌvælv/
(in a steam engine) a spring-loaded safety valve designed to open or close very rapidly at a predetermined pressure./ˈpɑp ˌvælv/ΘΚΠ
society > occupation and work > equipment > machine > parts of machines > control(s) > [noun] > valve > pop
pop valve1873
pop safety valve1876
1873 Buyers' Guide & Mechanics' Man. 266 (advt.) Prescott & Kalkman's patent safety pop valve.
1927 E. L. Ahrons Brit. Steam Railway Locomotive xxiii. 364/2 Ramsbottom safety valves, though still used, are rapidly giving place to pop valves of the Ross pattern.
1985 Internat. Jrnl. Heat & Fluid Flow 6 279 The model has shown satisfactory agreement with experimental data from a..pop valve operating in air.
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