Low volume vacuum toilet assembly
First Claim
1. A duckbill valve having an integral body of elastomeric material with a Type A durometer between 40-70, and having a tubular inlet portion at a first end with a diameter of less than 2 inches, and side walls tapering down to sealing edges at a second end opposite the first end, the side walls and sealing edges having predetermined thicknesses;
- and wherein the ratio of wall thickness to sealing edge thickness is about 1;
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6 Assignments
0 Petitions
Accused Products
Abstract
A vacuum tank assembly has a low volume configuration so that it can be used in boats and recreational vehicles where space is at a premium. A stack of components, with a waste tank at the bottom, then a vacuum tank with directly connected vacuum pump, and one or more fresh water tanks, is located remote from a vacuum toilet, with a discharge from the toilet (below a vacuum-tight ball valve) connected to the vacuum tank, which is in turn connected to the vacuum pump, in turn connected to the waste tank. A submersible centrifugal pump may be provided mounted to a cap of the water tank, with an anti-siphon device associated with it. The vacuum tank is of high density polypropylene having flat walls, with no continuous flat surface more than 80 square inches. Lipless duckbill check valves are provided on opposite sides of the vacuum pump, the valves of elastomeric material having a ratio of the wall thickness to thickness of the sealing edges of about 1:1. The waste tank may have a dip tube with a dog leg portion having a large cross-sectional are oval bottom opening to minimize the possibility of clogging.
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Citations
16 Claims
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1. A duckbill valve having an integral body of elastomeric material with a Type A durometer between 40-70, and having a tubular inlet portion at a first end with a diameter of less than 2 inches, and side walls tapering down to sealing edges at a second end opposite the first end, the side walls and sealing edges having predetermined thicknesses;
- and wherein the ratio of wall thickness to sealing edge thickness is about 1;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- and wherein the ratio of wall thickness to sealing edge thickness is about 1;
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10. A vacuum pump comprising:
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an inlet and an outlet; and a check valve disposed in at least one of said inlet and outlet, said check valve comprising a lipless duckbill valve of elastomeric material with a Type A durometer between 40-70, and having a valve inlet with a diameter of less than 2 inches, and side walls terminating in edges remote from said valve inlet, and wherein the ratio of the thickness of said side walls to the thickness of said edges is about 1;
1. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification