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In some embodiments, a vented valve assembly for attachment to a rigid container may include one or more of the following features: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, and (b) a second end and a liquid outlet port, said liquid inlet

In some embodiments, a vented valve assembly for attachment to a rigid container may include one or more of the following features: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, and (b) a second end and a liquid outlet port, said liquid inlet end adapted for connection to a male spout on a wall of the rigid container, said liquid outlet port being exterior to the wall of the rigid container when the liquid inlet end is affixed to the spout, the valve body further including an air vent opening formed through a wall of the tubular valve body leading to a channel affixed to an inner wall of the tubular valve body, the channel having one open end.

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1. A vented valve assembly for attachment to a rigid container comprising: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, a second end and a liquid outlet port, said liquid inlet end adapted for connection to a male spout on a wall of the rigid

1. A vented valve assembly for attachment to a rigid container comprising: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, a second end and a liquid outlet port, said liquid inlet end adapted for connection to a male spout on a wall of the rigid container, said liquid outlet port being exterior to the wall of the rigid container when the liquid inlet end is affixed to the spout, the valve body further including an air vent opening formed through a wall of the tubular valve body leading to a channel affixed to an inner wall of the tubular valve body, the channel having one open end;(b) a first valve member slidingly disposed in said channel and adapted to be moved between a blocking and an open position relative to said one open end of the channel;(c) a collapsible dome member secured to the valve body in covering relation to said second end of the tubular valve body and movable between a compressed and an expanded state; and(d) an elongated, generally rigid stem member having a first end attachable to the collapsible dome and a second end joined to a second valve member adapted to cooperate with the liquid inlet end of the tubular valve body for uncovering the liquid inlet end when the collapsible dome is in the compressed state, said stem member supporting a third valve member for cooperating with the liquid outlet port, and a spring-type valve displacement pin carried on the second valve member for holding the first valve member closed when the collapsible dome is in the expanded state. 2. The vented valve assembly of claim 1, wherein the second valve member and the third valve member simultaneously move to uncover the liquid inlet end and the liquid outlet port upon compression of the collapsible dome. 3. The vented valve assembly of claim 1, and further comprising a longitudinal guideway formed on the channel and a follower projecting from the stem member into the guideway for preventing rotation of the stem member. 4. The vented valve assembly of claim 1, wherein the valve body includes a radially extending flange proximate the second end. 5. The vented valve assembly of claim 4, and further comprising finger accommodating indentations in said wall of the tubular valve body adjacent to said flange. 6. The vented valve assembly of claim 4, wherein the tubular valve body and said channel are integrally injection molded of a rigid plastic selected from a group consisting of polypropylene, polyethylene, polycarbonate and blends thereof. 7. The vented valve assembly of claim 3, wherein the valve displacement pin is resiliently affixed to a back surface of said second valve member and the follower in the guideway maintains alignment of the pin with the first valve member. 8. The vented valve assembly of claim 1, wherein the first valve member is moved to its open position by air pressure. 9. A vented valve assembly, comprising: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, a second end and a liquid outlet port, said liquid inlet end adapted for connection to a male spout on a wall of the rigid container, said liquid outlet port being exterior to the wall of the rigid container when the liquid inlet end is affixed to the spout, the valve body further including an air vent opening formed through a wall of the tubular valve body leading to a channel affixed to an inner wall of the tubular valve body, the channel having one open end;(b) a first valve member slidingly disposed in said channel and adapted to be moved between a blocking and an open position relative to said one open end of the channel;(c) a collapsible dome member secured to the valve body in covering relation to said second end of the tubular valve body and movable between a compressed and an expanded state;(d) an elongated, generally rigid stem member having a first end attachable to the collapsible dome and a second end joined to a second valve member adapted to cooperate with the liquid inlet end of the tubular valve body for uncovering the liquid inlet end when the collapsible dome is in the compressed state, said stem member supporting a third valve member for cooperating with the liquid outlet port, and a spring-type valve displacement pin carried on the second valve member for holding the first valve member closed when the collapsible dome is in the expanded state; and(e) a dual sealing bond is created when the first valve member and the second valve member seal a rigid container from the vented valve assembly so no fluid can be allowed in the vented valve assembly until first use. 10. The vented valve assembly of claim 9, wherein the second valve member and the third valve member simultaneously move to uncover the liquid inlet end and the liquid outlet port upon compression of the collapsible dome. 11. The vented valve assembly of claim 9, and further comprising a longitudinal guideway formed on the channel and a follower projecting from the stem member into the guideway for preventing rotation of the stem member. 12. The vented valve assembly of claim 9, wherein the valve body includes a radially extending flange proximate the second end. 13. The vented valve assembly of claim 9, wherein minimal fluid is captured in the valve assembly after usage. 14. The vented valve assembly of claim 9, wherein the second valve member seals the liquid outlet port from any fluid in the vented valve assembly. 15. A valve assembly, comprising: (a) a unitary tubular valve body of a generally cylindrical hollow form and having a liquid inlet end, a second end and a liquid outlet port, said liquid inlet end adapted for connection to a male spout on a wall of the rigid container, said liquid outlet port being exterior to the wall of the rigid container when the liquid inlet end is affixed to the spout, the valve body further including an air vent opening formed through a wall of the tubular valve body leading to a channel affixed to an inner wall of the tubular valve body, the channel having one open end;(b) a first valve member slidingly disposed in said channel and adapted to be moved between a blocking and an open position relative to said one open end of the channel;(c) a collapsible dome member secured to the valve body in covering relation to said second end of the tubular valve body and movable between a compressed and an expanded state;(d) an elongated, generally rigid stem member having a first end attachable to the collapsible dome and a second end joined to a second valve member adapted to cooperate with the liquid inlet end of the tubular valve body for uncovering the liquid inlet end when the collapsible dome is in the compressed state, said stem member supporting a third valve member for cooperating with the liquid outlet port, and a spring-type valve displacement pin carried on the second valve member for holding the first valve member closed when the collapsible dome is in the expanded state; and(e) a longitudinal guideway formed on the channel and a follower projecting from the stem member into the guideway for preventing rotation of the stem member. 16. The valve assembly of claim 15, wherein the valve body includes a radially extending flange proximate the second end and further includes a finger accommodating indentations in said wall of the tubular valve body adjacent to said flange. 17. The valve assembly of claim 16, wherein the tubular valve body and said channel are integrally injection molded of a rigid plastic selected from a group consisting of polypropylene, polyethylene, polycarbonate and blends thereof. 18. The valve assembly of claim 16, wherein the valve displacement pin is resiliently affixed to a back surface of said second valve member and the follower in the guideway maintains alignment of the pin with the first valve member. 19. The valve assembly of claim 18, wherein the valve displacement pin resiliently affixed to the back surface has a spring-type function to ensure sealing force over varying manufacturing tolerances. 20. The valve assembly of claim 19, wherein the spring-type function also closes an air return poppet prior to complete sealing of the first valve member seal.