Modular valve assembly and system with airtight, leakproof and shockproof closure for engagement in the neck of a container

An airtight, shockproof, leakproof and evaporation proof valve assembly effective against vibration, evaporation, changes in temperature, pressure, and enabling the maintenance of sterility, including a seat, seal, and segmented retainer responsive to compressive force applied by a cap for locking the seal against the seat and for providing an airtight seal to the interior, exterior and top surfaces of a flexible container over a wide range of tolerances irrespective of the presence of flash or other nonconformities on the container comprising;

• a seat having a tapered body for defining a flow path including an orifice for dispensing a flowable medium held in the container, the seat further comprising a base extending outwardly from the body culminating in a peripheral rim, said base comprising a top surface extending to said rim, a bottom surface having a first downwardly extending leg for sealing engagement with the interior surface of the container, a second downwardly extending leg including a series of threads for engagement with one or more corresponding threads on the outer surface of the container, and a shoulder portion joining the first and second legs for sealing engagement with the top of the container;
• a tapered elastomeric seal substantially coextensive with the seat for sealing engagement against all but the distal portion of the seat, the seal enabling outflow of the flowable medium upon application of a sufficient cracking pressure to the flowable medium upon removal of the cap;
• a retainer for holding the seal in place against the seat, said retainer having a tapered portion divided into a plurality of segments for moveable engagement against the seal, a central portion having an interior surface for holding the seal against the seat and an exterior surface provided with engagement means for snap engagement with the cap, and a base having a first potion for engagement against the peripheral rim of the seat, a second portion for engagement against the top surface of the base of the seat and a third portion for locking the base of the seal to the base of the seat;
• a cap for seating engagement with the retainer for providing a strong compressive force to close the segments of the retainer against the seal to form an airtight seal against the seat which is impervious to vibration, temperature and changes in differential pressure when the cap is seated.

An airtight, shockproof, leakproof and evaporation proof valve assembly system capable of extending the useful life of a fluid contained in a volumetrically reducible or compressible container to the fluid's shelf life, for maintaining the sterility and integrity of the fluid against evaporation, vibration, temperature, pressure, and unintentional ingress and egress of matter, said valve assembly system comprising:

• a volumetrically reducible or compressible container, serving as a fluid reservoir, having a neck for attachment to the valve assembly;
• a tapered seat defining a flow path to an exit port for the contained fluid, the seat comprising:
• a U shaped base having a first surface extending for sealing contact with an interior surface of the neck;
• a second surface for locking engagement with an exterior surface of the neck;
• and a shoulder portion connecting said first and second surfaces for sealing a top surface of the neck;
• the base of said seat further comprising an upwardly extending rim for holding a retainer;
• an elastomeric seal substantially coextensive with the tapered portion of the seat for moveable sealing engagement against the seat for sealing the exit port of said seat against flow when the atmospheric pressure is equal or greater than the pressure in the container;
• a retainer having a base including a peripheral surface for engagement against the inner surface of the rim of the seat and having an engagement surface extending upwardly from the retainer base for repeatable locking engagement with a cap;
• said retainer further comprising one or more segments extending distally from the engagement surface wherein said segments progressively close and are compressed against the seal upon locking engagement of the retainer with the cap, such that the seal is held in conformable engagement against the seat providing an invariant airtight, leakproof seal between the seal and seat which is effective against vibration, temperature, pressure, evaporation, unintentional ingress or egress of matter, and extends the useful life of that fluid in the container to its shelf life, so that during use, the container behaves as though it has never been opened.