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A normally open check valve, incorporating a bell-shaped check valve member, and filter assembly incorporating same, wherein the specific gravity of the bell shaped member volume as defined by the throat, and exterior wall of the bell shaped member is less than one, and the bell shaped member is dis

A normally open check valve, incorporating a bell-shaped check valve member, and filter assembly incorporating same, wherein the specific gravity of the bell shaped member volume as defined by the throat, and exterior wall of the bell shaped member is less than one, and the bell shaped member is disposed adjacent a valve seat in a chamber with the throat opening thereof generally facing a liquid source, among other things. The low specific gravity for the bell shaped member volume may be attained by way of example, by the bell shaped member interior capturing and retaining a gas bubble when the throat of the member is exposed to a liquid-gas interface, or by a thin member covering the throat of the bell shaped member to encapsulate a gas bubble, or by a foamed synthetic resin material in the interior of the bell shaped member, or a combination thereof.

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1. A normally open check valve for passing gas in a first direction, from an upstream side of the valve to a downstream side of the valve, and for passing gas in a reverse direction to the first direction, and for preventing liquid flow in the first direction, comprising:a) a body member having a ch

1. A normally open check valve for passing gas in a first direction, from an upstream side of the valve to a downstream side of the valve, and for passing gas in a reverse direction to the first direction, and for preventing liquid flow in the first direction, comprising:a) a body member having a chamber with at least one side wall, an upstream and a downstream opening, the side wall including a tubular side wall portion having a diameter narrowing to at least a contact diameter as the chamber side wall extends upstream; b) a bell shaped member with a portion of the member received within the tubular chamber and having a mouth, a closed base, and a flexible wall extending between the mouth and the base that includes an annular portion of diameter greater than the contact diameter of the chamber side wall and greater than the perimeter of the mouth, wherein the specific gravity of the bell shaped member volume as defined by the mouth opening, the base and the wall therebetween is less than one, and the mouth is disposed within the tubular chamber portion facing upstream and the base is generally downstream of the mouth; and c) a retaining member affixed to the bell shaped member base, extending generally downstream from the bell shaped member base, and adapted to engage the chamber side wall downstream of the contact diameter; whereby the retaining member arrests movement of the bell shaped member when gas flows past the bell shaped member, and when liquid flows in the first direction past the mouth of the bell shaped member, the bell shaped member wall peripherally contacts the contact diameter of the chamber to thereby stop the flow of liquid past the bell shaped member. 2. The check valve of claim 1 wherein the bell shaped member and the retaining member comprise a silicone material.3. The check valve of claim 2 wherein the bell shaped member and the retaining member are monolithic.4. The check valve of claim 1 wherein the retaining member includes a lateral member disposed across the downstream chamber opening.5. The check valve of claim 1, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the contact diameter, wherein the flange outboard diameter is greater than the chamber contact diameter.6. The check valve of claim 5, wherein the flange is discontinuous about the bell shaped member exterior.7. The check valve of claim 5, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a flexible synthetic resin material.8. The check valve of claim 5, wherein the flange is continuous about the bell shaped member exterior.9. The check valve of claim 8, wherein the bell shaped member, retaining member, and flange are monolithic.10. The check valve of claim 1, wherein the bell shaped member interior comprises gas when the mouth of the bell shaped member contacts liquid.11. The check valve of claim 1, wherein the bell shaped member mouth is covered by a thin walled member to enclose gas within the bell shaped member.12. The valve of claim 1, where the bell shaped member interior comprises a foamed synthetic resin material.13. A normally open check valve for passing gas in a first direction, from an upstream side of the valve to a downstream side of the valve, and for passing gas in a reverse direction to the first direction, and for preventing liquid flow in the first direction, comprising:a) a body member having a chamber with at least one side wall that includes a seating surface having a first diameter; b) a flexible synthetic resin bell shaped member having a closed end, a wall with a second exterior diameter greater than the seating surface first diameter and a throat with an inner diameter less than the second exterior diameter, wherein the specific gravity of the bell shaped member volume as defined by the throat, the base and the wall is less than one, and the bell shaped member is disposed in the chamber with the throat opening facing upstream and the base generally downstream of the mouth; and c) a synthetic resin retaining member affixed to the bell shaped member base, extending generally downstream from the bell shaped member base, with a portion thereof extending laterally to the downstream direction adapted to engage the chamber side wall downstream of the seating surface; whereby the retaining member arrests movement of the bell shaped member when gas flows in the direction reverse of the first direction, and the bell shaped member wall peripherally contacts the seating surface of the chamber at an initial seating wall portion to thereby stop the flow of liquid when liquid flows in the first direction past the seating surface. 14. The check valve of claim 13, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.15. The check valve of claim 14, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.16. The check valve of claim 14, wherein the flange is discontinuous about the bell shaped member exterior.17. The check valve of claim 16, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.18. The check valve of claim 14, wherein the flange is continuous about the bell shaped member exterior.19. The check valve of claim 18, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.20. The check valve of claim 13, wherein the bell shaped member interior comprises gas when the throat of the bell shaped member contacts liquid.21. The check valve of claim 13, wherein the bell shaped member mouth is covered by a thin walled member to enclose gas within the bell shaped member.22. The check valve of claim 13, wherein the bell shaped member interior comprises a foamed synthetic resin material.23. An air filter assembly comprising:a) a housing having a chamber with at least one side wall that includes a seating surface having a first diameter, with the chamber having an inlet and an outlet; b) a filtration medium affixed over the outlet of the housing chamber; and c) a flexible synthetic resin bell shaped member having a closed end, a wall with a second exterior diameter greater than the seating surface first diameter and a throat with an inner diameter less than the bell shaped member second exterior diameter, wherein the specific gravity of the bell shaped member volume as defined by the throat, the base and the wall is less than one, and the bell shaped member is disposed in the chamber with the throat opening toward the chamber inlet and the base facing toward the chamber outlet; d) a synthetic resin retaining member monolithic with the bell shaped member base, extending generally toward the chamber outlet and further including a portion extending over the chamber outlet and adapted to engage a portion of the housing; whereby the retaining member arrests movement of the bell shaped member toward the chamber inlet when air flows through the filtration medium toward the chamber inlet, and the bell shaped member wall peripherally contacts the seating surface of the chamber at an initial seating wall portion to thereby stop the flow of liquid when liquid flows from the chamber inlet past the seating surface, to thereby provide a normally open check valve passing gas between the inlet and outlet, and preventing liquid flow through the filtration material. 24. The air filter assembly of claim 23, wherein the bell shaped member interior comprises gas when the throat of the bell shaped member contacts liquid.25. The air filter assembly of claim 24, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.26. The air filter assembly of claim 25, wherein the bell shaped member, retaining member, and flange are monolithic.27. The air filter assembly of claim 26, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.28. The air filter assembly of claim 27, wherein the flange is continuous about the bell shaped member exterior.29. The air filter assembly of claim 26, wherein the flange is discontinuous about the bell shaped member exterior.30. The air filter assembly of claim 24, wherein the bell shaped member and retaining member are monolithic.31. The air filter assembly of claim 30, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.32. The air filter assembly of claim 23, wherein the bell shaped member and retaining member are monolithic.33. The air filter assembly of claim 32, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.34. The air filter assembly of claim 23, wherein the bell shaped member mouth is covered by a thin walled member to enclose gas within the bell shaped member.35. The air filter assembly of claim 34, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.36. The air filter assembly of claim 35, wherein the bell shaped member, retaining member, and flange are monolithic.37. The air filter assembly of claim 36, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.38. The air filter assembly of claim 35, wherein the flange is discontinuous about the bell shaped member exterior.39. The air filter assembly of claim 38, wherein the bell shaped member, retaining member, and flange are monolithic.40. The air filter assembly of claim 39, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.41. The air filter assembly of claim 35, wherein the flange is continuous about the bell shaped member exterior.42. The air filter assembly of claim 41, wherein the bell shaped member, retaining member, and flange are monolithic.43. The air filter assembly of claim 42, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.44. The check valve of claim 23, wherein the bell shaped member interior comprises a foamed synthetic resin material.45. The air filter assembly of claim 44, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.46. The air filter assembly of claim 45, wherein the bell shaped member, retaining member, and flange are monolithic.47. The air filter assembly of claim 46, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.48. The air filter assembly of claim 45, wherein the flange is discontinuous about the bell shaped member exterior.49. The air filter assembly of claim 48, wherein the bell shaped member, retaining member, and flange are monolithic.50. The air filter assembly of claim 49, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.51. The air filter assembly of claim 45, wherein the flange is continuous about the bell shaped member exterior.52. The air filter assembly of claim 51, wherein the bell shaped member, retaining member, and flange are monolithic.53. The air filter assembly of claim 52, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.54. A normally open check valve for passing gas in a first direction, from an upstream side of the valve to a downstream side of the valve, and for passing gas in a reverse direction to the first direction, and for preventing liquid flow in the first direction, comprising:a) a body member having a chamber with at least one side wall that includes a seating surface having a first diameter; b) a flexible synthetic resin bell shaped member having a closed end, a wall with a second exterior diameter greater than the seating surface first diameter and a throat with an inner diameter less than the second exterior diameter, wherein the specific gravity of the bell shaped member volume as defined by the throat, the base and the wall is less than one, and the bell shaped member is disposed in the chamber with the throat opening facing upstream and the base generally downstream of the mouth; and c) a synthetic resin retaining member affixed to the bell shaped member base, with a portion extending to engage a portion of the chamber side wall; whereby the retaining member arrests movement of the bell shaped member when gas flows in the direction reverse of the first direction, and the bell shaped member wall peripherally contacts the seating surface of the chamber at an initial seating wall portion to thereby stop the flow of liquid when liquid flows in the first direction past the seating surface. 55. The check valve of claim 54, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.56. The check valve of claim 55, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.57. The check valve of claim 55, wherein the flange is discontinuous about the bell shaped member exterior.58. The check valve of claim 57, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.59. The check valve of claim 55, wherein the flange is continuous about the bell shaped member exterior.60. The check valve of claim 59, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.61. The check valve of claim 54, wherein the bell shaped member interior comprises gas when the throat of the bell shaped member contacts liquid.62. The check valve of claim 61, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.63. The check valve of claim 62, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.64. The check valve of claim 62, wherein the flange is discontinuous about the bell shaped member exterior.65. The check valve of claim 64, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.66. The check valve of claim 62, wherein the flange is continuous about the bell shaped member exterior.67. The check valve of claim 66, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.68. The check valve of claim 54, wherein the bell shaped member mouth is covered by a thin walled member to enclose gas within the bell shaped member.69. The check valve of claim 68, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.70. The check valve of claim 69, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.71. The check valve of claim 70, wherein the flange is continuous about the bell shaped member exterior.72. The check valve of claim 71, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.73. The check valve of claim 69, wherein the flange is discontinuous about the bell shaped member exterior.74. The check valve of claim 73, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.75. The check valve of claim 54, wherein the bell shaped member interior comprises a foamed synthetic resin material.76. The check valve of claim 75, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.77. The check valve of claim 76, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.78. The check valve of claim 76, wherein the flange is discontinuous about the bell shaped member exterior.79. The check valve of claim 78, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.80. The check valve of claim 76, wherein the flange is continuous about the bell shaped member exterior.81. The check valve of claim 80, wherein the bell shaped member, retaining member, and flange are monolithic and comprise a silicone material.82. An air filter assembly comprising:a) a housing having a chamber with at least one side wall that includes a seating surface having a first diameter, with the chamber having an inlet and an outlet; b) a filtration medium affixed over the outlet of the housing chamber; and c) a flexible synthetic resin bell shaped member having a closed end, a wall with a second exterior diameter greater than the seating surface first diameter and a throat with an inner diameter less than the bell shaped member second exterior diameter, wherein the specific gravity of the bell shaped member volume as defined by the throat, the base and the wall is less than one, and the bell shaped member is disposed in the chamber with the throat opening toward the chamber inlet and the base facing toward the chamber outlet; d) a synthetic resin retaining member monolithic with the bell shaped member base, including a portion adapted to engage a portion of the housing; whereby the retaining member arrests movement of the bell shaped member toward the chamber inlet when air flows through the filtration medium toward the chamber inlet, and the bell shaped member wall peripherally contacts the seating surface of the chamber at an initial seating wall portion to thereby stop the flow of liquid when liquid flows from the chamber inlet past the seating surface, to thereby provide a normally open check valve passing gas between the inlet and outlet, and preventing liquid flow through the filtration material. 83. The air filter assembly of claim 82, wherein the bell shaped member interior comprises gas when the throat of the bell shaped member contacts liquid.84. The air filter assembly of claim 83, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.85. The air filter assembly of claim 84, wherein the bell shaped member, retaining member, and flange are monolithic.86. The air filter assembly of claim 85, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.87. The air filter assembly of claim 86, wherein the flange is continuous about the bell shaped member exterior.88. The air filter assembly of claim 85, wherein the flange is discontinuous about the bell shaped member exterior.89. The air filter assembly of claim 83, wherein the retaining member extends upstream from the bell shaped member wall.90. The air filter assembly of claim 89, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.91. The air filter assembly of claim 82, wherein the retaining member extends from the bell shaped member wall.92. The air filter assembly of claim 91, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.93. The air filter assembly of claim 82, wherein the bell shaped member mouth is covered by a thin walled member to enclose gas within the bell shaped member.94. The air filter assembly of claim 93, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.95. The air filter assembly of claim 94, wherein the bell shaped member, retaining member, and flange are monolithic.96. The air filter assembly of claim 95, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.97. The air filter assembly of claim 94, wherein the flange is discontinuous about the bell shaped member exterior.98. The air filter assembly of claim 97, wherein the bell shaped member, retaining member, and flange are monolithic.99. The air filter assembly of claim 98, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.100. The air filter assembly of claim 94, wherein the flange is continuous about the bell shaped member exterior.101. The air filter assembly of claim 100, wherein the bell shaped member, retaining member, and flange are monolithic.102. The air filter assembly of claim 101, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.103. The check valve of claim 82, wherein the bell shaped member interior comprises a foamed synthetic resin material.104. The air filter assembly of claim 103, the bell shaped member further comprising a flange member on the bell shaped member exterior between the mouth and the initial seating wall portion, wherein the flange outboard diameter is greater than the seating surface first diameter.105. The air filter assembly of claim 104, wherein the bell shaped member, retaining member, and flange are monolithic.106. The air filter assembly of claim 105, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.107. The air filter assembly of claim 104, wherein the flange is discontinuous about the bell shaped member exterior.108. The air filter assembly of claim 107, wherein the bell shaped member, retaining member, and flange are monolithic.109. The air filter assembly of claim 108, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.110. The air filter assembly of claim 104, wherein the flange is continuous about the bell shaped member exterior.111. The air filter assembly of claim 110, wherein the bell shaped member, retaining member, and flange are monolithic.112. The air filter assembly of claim 111, further comprising a synthetic resin cover member retained upon the housing and extending over the filtration medium.