Vacuum relief valve for sewage holding tank

Details Vacuum relief valve for sewage holding tank Vacuum relief valve for sewage holding tank

1998-05-22

2000-05-23

Rivell, John

Fluid handling

Line condition change responsive valves

Direct response valves

1374542, 137526, 137854, 4321, 4323, F16K 1514, E03D 134

Patent

active

060654937

ABSTRACT:
A plastic sewage holding tank in a boat, associated with a toilet, includes a vent check valve assembly for providing vacuum relief. By mounting the vent check valve in the top of the tank, when the tank is being emptied by rapid pumpout implosion or other damage to the tank is prevented. The vent check valve assembly may include a valve body surface operatively connected to the tank and having a plurality of openings formed in it, and a flexible material diaphragm covering the openings adjacent the inside of the tank, and uncovering openings to allow air flow through the openings substantially only when a vacuum condition exists inside the tank. A plastic disk biases the diaphragm into its opening-covering position, but a partial vacuum of at least about 2-5 inches of water allows air to flow through the openings past the diaphragm.

REFERENCES:
patent: 2270468 (1942-01-01), Osborn, Jr.
patent: 5014739 (1991-05-01), Csaszar
patent: 5060689 (1991-10-01), Csaszar et al.
patent: 5601112 (1997-02-01), Sekiya et al.

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