Port closure system with hydraulic hammer resistance
A port closure system ( 20 ) including a port structure ( 22 ), and a valve ( 24 ). The port structure ( 22 ) includes a port ( 28 ) for establishing communication between an exterior environment ( 30 ) and interior volume ( 32 ) that can receive a fluent substance. The valve ( 24 ) includes a flexible, resilient, self-closing, slit-type valve head ( 36 ) with an orifice that is normally closed in an unconstrained condition. The port ( 28 ) has a laterally inwardly facing engaging surface ( 34 ) and the valve has a laterally outwardly facing peripheral surface ( 54 ) that is compressed laterally inwardly by engagement with the surface ( 34 ) to increase the resistance of the normally closed orifice to opening when the head ( 36 ) is subjected to a pressure differential.
1. A port closure system with hydraulic hammer resistance, said system comprising:
a port to establish communication between an interior volume that can receive a fluent substance and an exterior environment, the port having a laterally inwardly facing engaging surface; and
a valve including a flexible, resilient head extending across the port, the head having:
an interior side facing the interior volume;
an exterior side facing the exterior environment;
at least one self-sealing slit through the head;
confronting, openable portions along the slit to define a normally closed orifice in an unconstrained condition wherein the openable portions can move in a first direction toward the interior volume to an open orifice configuration and in a second direction toward the exterior environment to an open orifice configuration; and
a laterally outwardly facing peripheral surface compressed laterally inwardly by engagement with the engaging surface to thereby impose a closing force on said self-sealing slit to increase the resistance of the normally closed orifice to opening in at least the second direction when the valve head is subjected to a pressure differential acting across the valve head.
2. The port closure system of claim 1 wherein the interior side is defined by a convex surface.
3. The system of claim 2 wherein the convex surface is arcuate.
4. The system of claim 1 wherein the exterior side is defined by a concave surface.
5. The system of claim 4 wherein the concave surface is arcuate.
6. The system of claim 4 wherein the concave surface is semispherical.
7. The system of claim 1 wherein the at least one self-sealing slit comprises two self-sealing slits extending transverse to each other.
8. The system of 7 wherein one of the two slits is more than 50% longer than the other of the two slits.
9. A port closure system with hydraulic hammer resistance, said system comprising:
a port to establish communication between an interior volume that can receive a fluent substance and an exterior environment, the port having a laterally inwardly facing engaging surface; and
a valve including a flexible, resilient head extending across the port, the head having:
an interior side facing the interior volume;
an exterior side facing the exterior environment;
at least one self-sealing slit through the head;
confronting, openable portions along the slit to define a normally closed orifice in an unconstrained condition wherein the openable portions can move in a first direction toward the interior volume to an open orifice configuration and in a second direction toward the exterior environment to an open orifice configuration;
a laterally outwardly facing peripheral surface compressed laterally inwardly by engagement with the engaging surface to thereby impose a closing force on said self-sealing slit to increase the resistance of the normally closed orifice to opening in at least the second direction when the valve head is subjected to a pressure differential acting across the valve head; and
wherein the engaging surface is a cylindrical surface with a diameter D and the laterally outwardly facing peripheral surface is a frusto-conical surface in the unconstrained condition.
10. The system of claim 9 wherein the frusto-conical surface has a maximum diameter adjacent the interior side that in the unconstrained condition is greater than the diameter D.
11. The system of claim 10 wherein the valve further comprises a peripheral attachment portion and the frusto-conical surface converges from the maximum diameter to a minimum diameter adjacent the peripheral attachment portion.
12. The system of claim 1 wherein the valve is initially separate from, but subsequently engaged with the engaging surface.
13. The system of claim 12 further comprising a seat around the port and wherein the valve further comprises a peripheral attachment portion engaged in said seat.
14. The system of claim 13 wherein said seat is located outside of the interior volume.
15. The system of claim 13 further comprising a retainer ring in snap-fit engagement with said seat to clamp the peripheral attachment portion between the retainer ring and the seat.
16. The system of claim 13 wherein the laterally outwardly facing peripheral surface extends from the interior side to the peripheral attachment portion.
17. A port closure system with hydraulic hammer resistance, said system comprising:
a port structure including a port for establishing communication between (1) an interior volume that can receive a fluent substance, and (2) an exterior environment, said port including an laterally inwardly facing engaging surface; and
a valve that is disposed across said port and that has:
(1) a peripheral attachment portion; and
(2) a flexible, resilient head that extends from said peripheral attachment portion, and that has (a) an interior side, (b) an exterior side interfacing with said exterior environment, (c) at least one self-sealing slit through said head, (d) a laterally peripheral surface, (e) confronting, openable portions along said slit to define an initially closed orifice wherein said valve head openable portions can move generally in a first direction toward said interior volume to an open configuration and wherein said valve head openable portions can also move generally in a second direction toward said exterior environment to an open configuration, (f) an initial, manufactured configuration in which said valve orifice is closed; and
wherein said valve head is disposed in said port structure to locate said laterally peripheral surface of said valve head in engagement with, and compressed laterally inwardly by, said engaging surface of said port structure to thereby impose stress on said valve head to increase the resistance of said valve orifice to opening at least in said second direction when said valve head is subjected to a pressure differential acting across said valve head.
18. The system in accordance with claim 17 in which
said valve is initially separate from, but subsequently attachable to, said port structure across said port; and
said port structure defines a seat around said port for receiving said valve peripheral attachment portion in a seated engagement.
19. The system in accordance with claim 18 , wherein said system further includes a retainer ring in snap-fit engagement with said port structure to clamp said valve between said retainer ring and said seat.