摘要：

A nozzle for dispensing a product while perserving the sterility of the product remaining in storage incorporates a mechanism which combines a flexible static seal and a valve. The valve moves as the static seal is deflected to open an orifice allowing the stored product to be expelled into the air. The seal is deflected sufficiently to open the valve only when the pressure behind the seal is great enough to force flow from the product container to the atmosphere. If the pressure in the sterile container is lower than the ambient pressure, which would permit a flow of air and microbiological contaminants into the container, then the static seal, with the help of a spring, is deflected to force the valve to close.

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