Recreational vehicle drain vent

Details Recreational vehicle drain vent Recreational vehicle drain vent

1987-12-17

1989-03-14

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

4209R, 4211, 1372162, 137899, F16K 2400

Patent

active

048117536

ABSTRACT:
A drain vent apparatus for recreational vehicles may be coupled to the drain vent of a drain line of a vehicle and includes a coupling for a drain hose for the output of the drain vent. The drain vent has an outer housing and an inner pipe located in said outer housing and connected to the coupling for the drain vent for coupling to a drain line of a vehicle. The outer housing forms an annular passageway around the inner pipe for the passage of air and a check valve is located in the outer housing passageway to allow the passage of air in one direction while blocking the passage of water in the opposite direction so that the outside vent air may pass into the drain vent to vent the drain line. The outer housing has an opening to atmosphere covered by a cap. The check valve may be mounted adjacent to the opening in the passageway adjacent the cap so that removal of the cap allows access to the check valve. The smaller inner pipe forms a venturi with the outer housing at the opening of the passageway and inner pipe to the drain hose so that air is aspirated into the drain vent.

REFERENCES:
patent: 387961 (1888-08-01), Ryan
patent: 549364 (1895-11-01), Israel
patent: 933279 (1909-09-01), Welch
patent: 2303037 (1942-11-01), Fredrickson
patent: 2575905 (1951-11-01), Boosey
patent: 2852034 (1958-09-01), Shames
patent: 3766575 (1973-10-01), Grengs
patent: 3791401 (1974-02-01), Gorman
patent: 3894301 (1975-07-01), Bunch
patent: 4185654 (1980-01-01), Young

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