What is the meaning of Blow valve?

See Snifting valve.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). blow valve. Retrieved September 20, 2026, from http://smartdefine.org/blow_valve/definitions/1981116
ChicagoWebster's. 2011. "blow valve" http://smartdefine.org/blow_valve/definitions/1981116 (accessed September 20, 2026).
HarvardWebster's 2011, blow valve, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/blow_valve/definitions/1981116>.
MLAWebster's. "blow valve" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/blow_valve/definitions/1981116>