Pressure vacuum breaker

Details Pressure vacuum breaker Pressure vacuum breaker

1978-07-12

1980-09-16

Weakley, Harold W.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

13724725, 137253, 137254, E03C 110

Patent

active

042224055

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.

REFERENCES:
patent: 693763 (1902-02-01), Warner
patent: 1016372 (1912-02-01), Smith
patent: 1461404 (1923-07-01), Roth
patent: 1666487 (1928-04-01), Clements
patent: 2037731 (1936-04-01), Mobley
patent: 2264107 (1941-11-01), Willard
patent: 3187765 (1965-06-01), Frank
patent: 3237637 (1966-03-01), Ainsworth
patent: 3933168 (1976-01-01), Meyer
patent: 4045346 (1977-08-01), Swaskey

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