Apparatus for checking back pressure

Details Apparatus for checking back pressure Apparatus for checking back pressure

1992-07-16

1993-03-30

Rivell, John

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

13724715, 137559, 137362, 404 25, F16K 2400, F16K 3700

Patent

active

051975106

ABSTRACT:
Apparatus for monitoring gas pressure in a drain line including a housing, a liquid trap within the housing interior, a liquid collector for collecting liquid displaced from the trap when gas pressure in the drain line exceeds a predetermined level, and a valve for introducing air into the housing when a negative gas pressure exists in the drain line.

REFERENCES:
patent: 477499 (1892-06-01), Brown
patent: 961343 (1910-06-01), Evans
patent: 1423135 (1922-07-01), Miller
patent: 2800139 (1957-07-01), Langdon
patent: 3516541 (1970-06-01), Hardingham
patent: 3556993 (1971-01-01), Persson
patent: 4545398 (1985-10-01), van Olst
patent: 4682907 (1987-07-01), Gaudin
patent: 4776722 (1988-10-01), Gaudin

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