Abstract: The present invention is directed to a pressure-responsive valve assembly which functions in the nature of a check valve to control fluid flow across the assembly. The assembly includes a valve body which defines first and second internal flow passages, and includes a valve seat through which at least one flow port extends for joining the first and second passages in fluid communication with each other. A flexible, resiliently deformable valve member is positioned in operative association with the valve seat, and can be deflected, in response to a sufficient pressure differential, to move out of sealing engagement with the valve seat, to thereby permit fluid flow through the valve assembly.