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US 6,848,465 B1Granted
Dual-action vent check valve
AssigneeRobert H. Wager Co., Inc.
InventorJonathan T. Ledbetter
Life of this patent
Estimating the term…
Abstract
A dual-action vent check valve is disclosed. The valve includes a first check valve which is responsive to elevated fluids inside the valve. A second check valve is responsive to elevated fluids external to the valve. The first check valve prevents overflow from a vented structure, such as a sewer out-fall line, from passing through and out of the valve, thereby preventing spills. The second check valve operates to prevent floodwater from passing into an underground structure, such as a sewer, through the vent. One embodiment of the invention includes a basket for enclosing a deodorizing material inside the valve for deodorizing gases which pass through the valve.
Claims23
A vent check valve comprising:
- (a) an outer housing including a first port and a second port, the first and second ports being arranged to permit gases to pass through and between the first and second ports in two opposed directions during dry conditions;
- (b) a first check valve in the housing, the first check valve being designed to substantially prevent a first elevated liquid inside the valve that has risen to or above a first trigger level from passing through the valve;
- (c) a second check valve in the housing, the second check valve being designed to substantially prevent a second elevated liquid external to the valve that has risen to or above a second trigger level from passing through the valve;
- (d) wherein the first and second check valves are substantially vertically aligned one above the other;
- and
- (e) wherein the outer housing includes at least one removable panel, the at least one panel being configured to permit access to at least one of the check valves in the valve housing when the panel is removed from the valve.
3 more elements
A vent check valve comprising:
- (a) an outer housing including a first port and a second port, the first and second ports being arranged to permit gases to pass through and between the first and second ports in two opposed directions during dry conditions;
- (b) a first check valve in the housing, the first check valve being designed to substantially prevent a first elevated liquid inside the valve that has risen to or above a first trigger level from passing through the valve;
- (c) a second check valve in the housing, the second check valve being designed to substantially prevent a second elevated liquid external to the valve that has risen to or above a second trigger level from passing through the valve;
- (d) wherein the first and second check valves are substantially vertically aligned one above the other;
- and
- (e) wherein the valve further includes a deodorizer basket for holding an odor adsorbing material, wherein the basket is positioned in the valve such that gas or vapor passing through the valve passes through the odor adsorbing material in the basket before exiting the valve.
3 more elements
A vent check valve comprising:
- (a) an outer housing including a first port and a second port, the first and second ports being arranged to permit gases to pass through and between the first and second ports in two opposed directions during dry conditions;
- (b) a first check valve in the housing, the first check valve being designed to substantially prevent a first elevated liquid inside the valve that has risen to or above a first trigger level from passing through the valve;
- (c) a second check valve in the housing, the second check valve being designed to substantially prevent a second elevated liquid external to the valve that has risen to or above a second trigger level from passing through the valve;
- (d) wherein the first and second check valves are substantially vertically aligned one above the other;
- (e) wherein the second port includes a screen designed to substantially prevent solids from entering the valve through the second port;
- and
- (f) wherein the screen is affixed to a baffle cover, the baffle cover being removably affixed to an outer surface of the outer housing proximate the second port, and the baffle cover is configured to permit gases to pass through the screen and second port while at least partially covering the second port.
4 more elements
A vent check valve comprising:
- (a) an outer housing including a bottom and a front, the bottom including a lower port and the front including an upper port;
- (b) a partition dividing the outer housing into an upper chamber and a lower chamber, the partition including a first valve opening having a first valve seat;
- (c) an inner housing disposed in the upper chamber, the inner housing including a top having a second valve opening and a second valve seat, and a window in communication with the upper port;
- wherein the lower port, the first valve opening, the second valve opening, the window, and the upper port together define a gas flow path through the valve;
- (d) a lower float disposed in the lower chamber, the lower float being designed to cooperate with the first valve seat to substantially prevent rising liquid in the lower chamber which has entered the valve through the lower port from passing from the lower chamber into the upper chamber;
- and
- (e) an upper float disposed in the inner housing in the upper chamber, the upper float being designed to cooperate with the second valve seat to substantially prevent rising liquid exterior to the outer housing which has entered the valve through the upper port from passing from the upper chamber into the lower chamber;
- (f) wherein the second valve opening is substantially vertically above the first valve opening and is substantially vertically aligned therewith.
5 more elements
Dependencies are inferred from the claim text.