Title: Pressure vacuum breaker

Abstract: Excess steam pressure is relieved by displacement of a column of water through a vertical conduit opening a path for escape of steam through a space normally occupied by the water which normally acts as a seal. Under reversed conditions, air enters when the water is moved out of its sealing location by vacuum. The pressure vacuum breaker disclosed replaces flapper valves commonly used for pressure relief in paper making applications and has no moving mechanical parts.

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Inventors: Rosenblad, Axel E. (Highlands, NJ, US)

Application Number: 923775
Filing Date: 1978-07-12
Publication_date: 1980-09-16
Assignee: Rosenblad Corporation (Princeton, NJ)
Primary Class(es): 137/216.1 137/247.25, 137/253, 137/254
Other Classes:
US Patent Ref:

693763	Feb, 1902	Warner	137/247.
1016372	Feb, 1912	Smith	137/254.
1461404	Jul, 1923	Roth	137/254.
1666487	Apr, 1928	Clements	137/254.
2037731	Apr, 1936	Mobley	137/251.
2264107	Nov, 1941	Willard	137/254.
3187765	Jun, 1965	Frank	137/253.
3237637	Mar, 1966	Ainsworth	137/251.
3933168	Jan, 1976	Meyer	137/253.
4045346	Aug, 1977	Swaskey	137/247.

Other Refs:
Primary Examiner: Weakley, Harold W.
Assistant Examiner:
Attorney: Brooks, Haidt, Haffner & Delahunty