| 摘要 |
A one-piece fluid flow control valve for use in a fluid applicator tip which is connectable onto an open end of a resiliently squeezable bottle. The valve includes a cup-shaped body formed of resilient plastic material having a generally U-shaped longitudinal cross section which defines a hollow interior with an open end and a closed end. The body configured for coaxial alignment and seated retention within a mating interior surface of the applicator tip with the closed end oriented downstream of fluid flow through the applicator tip with respect to the open end. A normally closed slit formed into the body in close proximity to the closed end defines a flap, the slit automatically opening to permit fluid entering into the hollow interior to flow through the opened the slit when the bottle is held in an inverted orientation and squeezed to increase fluid pressure against the closed end to deflect the flap and open the slit. The slit automatically closes when there is no substantial pressure within the bottle, preventing substantial fluid flow therethrough while also permitting air to flow therethrough in a reverse or upstream direction, the air drawn into the bottle after the bottle has been squeezed into a resilient distorted configuration to expel fluid and then released.
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