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A valve for controlling flow of fluid through an aperture in a barrier comprises a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, and a diaphragm of resilient material. The diaphragm has an opening surrounded by an inner ma

A valve for controlling flow of fluid through an aperture in a barrier comprises a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, and a diaphragm of resilient material. The diaphragm has an opening surrounded by an inner margin and is disposed with the pin extending through the opening and with a main surface presented towards the continuous sealing surface of the valve body. The inner margin of the diaphragm is in a state of tension around the pin of the valve body, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body.

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1. A valve for controlling flow of fluid through an aperture in a barrier, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, wherein said pin has an outer portion and an inner portion, said inner portion being of

1. A valve for controlling flow of fluid through an aperture in a barrier, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, wherein said pin has an outer portion and an inner portion, said inner portion being of greater cross-sectional area than the outer portion, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is seated against the outer and inner portions of the pin of the valve body and is in a state of tension around said pin, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the outer portion of the pin is cylindrical, the continuous sealing surface is substantially annular and the diaphragm is substantially annular having an inner periphery that is smaller, when the diaphragm is in a relaxed condition, than the diameter of the outer portion of the pin, and the diameter of the inner periphery of the diaphragm, in said relaxed condition, is about half the diameter of the outer portion of the pin. 2. A valve for controlling flow of fluid through an aperture in a barrier, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, wherein said pin has an outer portion and an inner portion, said inner portion being of greater cross-sectional area than the outer portion, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is seated against the outer and inner portions of the pin of the valve body and is in a state of tension around said pin, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the outer portion of the pin is cylindrical, the continuous sealing surface is substantially annular and the diaphragm is substantially annular having an inner periphery that is smaller, when the diaphragm is in a relaxed condition, than the diameter of the outer portion of the pin, the inner portion of the pin is of a substantially frusto-conical shape, flaring outward from the outer portion. 3. A valve for controlling flow of fluid through an aperture in a barrier, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, wherein said pin has an outer portion and an inner portion, said inner portion being of greater cross-sectional area than the outer portion, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is seated against the outer and inner portions of the pin of the valve body and is in a state of tension around said pin, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the valve body includes a generally annular wall having first and second opposite axial ends, the wall has a surface at said first axial end for engaging the barrier and has an internal flange at said second axial end, the internal flange has a lip that projects towards said first axial end, the valve body also includes an apertured web that attaches the pin to the internal flange, and the pin extends from the apertured web towards said first axial end of the wall. 4. A valve according to claim 3, wherein the diaphragm is positioned on the pin with the inner margin of the diaphragm extending towards said first axial end of the wall. 5. A valve according to claim 3, wherein the apertured web comprises ribs extending radially inward from the wall towards a center boss which is adjacently and coaxially located to the inner portion of the pin. 6. In combination, a bag including a barrier of substantially fluid-tight material, said barrier being formed with an aperture, and a valve for controlling flow of fluid through said aperture, the valve comprising:a valve body secured to the barrier, the valve body including a pin and having a continuous sealing surface surrounding at least one passage through the valve body, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is in a state of tension around the pin of the valve body, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the valve body includes a generally annular wall having first and second opposite axial ends, the wall has a surface at said first axial end sealed to the barrier and has an internal flange at said second axial end, the internal flange has a lip that projects towards said first axial end, the valve body also includes ribs that attach the pin to the internal flange, and the pin extends from the ribs towards said first axial end of the wall. 7. A valve for controlling flow of fluid through an aperture in a barrier, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is in a state of tension around the pin of the valve body, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the valve body includes a generally annular wall having first and second opposite axial ends, the wall has a surface at said first axial end for engaging the barrier and has an internal flange at said second axial end, the internal flange has a lip that projects towards said first axial end, the valve body also includes an apertured web that attaches the pin to the internal flange, and the pin extends from the apertured web towards said first axial end of the wall. 8. A valve according to claim 7, wherein the continuous sealing surface is substantially annular, the pin has a substantially cylindrical portion and the diaphragm is substantially annular having an inner periphery that is smaller, when the diaphragm is in a relaxed condition, than the diameter of the cylindrical portion of the pin. 9. A valve according to claim 8, wherein the diameter of the inner periphery of the diaphragm, in said relaxed condition, is about half the diameter of the cylindrical portion of the pin. 10. A valve according to claim 8, wherein the pin has a substantially frusto-conical portion flaring outward from the cylindrical portion and the inner margin is seated against the cylindrical portion of the pin and the frusto-conical portion of the pin. 11. A valve according to claim 7, wherein the diaphragm is positioned on the center pin with the inner margin of the diaphragm in contact with the center pin, and the inner margin extends towards said first axial end of the wall. 12. A valve according to claim 7, c omprising a film of a sealing liquid on the sealing surface of the valve body. 13. In combination, a bag including a barrier of substantially fluid-tight material, said barrier being formed with an aperture, and a valve for controlling flow of fluid through said aperture, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, wherein said pin has a outer portion and an inner portion, said inner portion being of greater cross-sectional area than the outer portion, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is seated against the outer and inner portions of the pin of the valve body and is in a state of tension around said pin, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the valve body includes a generally annular wall having first and second opposite axial ends, the wall has a surface at said first axial end sealed to the barrier and has an internal flange at said second axial end, the internal flange has a lip that projects towards said first axial end, the valve body also includes ribs that attach the pin to the internal flange, and the pin extends from the ribs towards said first axial end of the wall. 14. In combination, a bag including a barrier of substantially fluid-tight material, said barrier being formed with an aperture, and a valve for controlling flow of fluid through said aperture, comprising:a valve body including a pin and having a continuous sealing surface surrounding at least one opening through the valve body, anda diaphragm of resilient material, the diaphragm having a main surface and an opening surrounded by an inner margin, the diaphragm being disposed with the pin extending through said opening and with the main surface presented towards said sealing surface,and wherein the inner margin of the diaphragm is in a state of tension around the pin of the valve body, whereby the diaphragm is prestressed to a condition in which the main surface of the diaphragm engages the sealing surface of the valve body, the valve body includes a generally annular wall having first and second opposite axial ends, the wall has a surface at said first axial end for engaging the barrier and has an internal flange at said second axial end, the internal flange has a lip that projects towards said first axial end, the valve body also includes an apertured web that attaches the pin to the internal flange, and the pin extends from the apertured web towards said first axial end of the wall.