Abstract: A nipple assembly is removably attachable to a baby bottle via a retainer ring and comprises a nipple having a flow aperture through one end, and a nipple flange structured to support the nipple. A flow control valve assembly is mounted to the nipple flange and extends inwardly from an inner surface of the nipple flange, the flow control valve assembly is structured to allow pressures to equilibrate between the inside and outside of the baby bottle, without allowing fluid to leak therethrough. A training cup spout assembly is removably attachable to a cup and comprises a spout having a spout channel extending therethrough. The spout channel has a dual valve assembly mounted therein to permit flow for drinking, as well as to prevent leakage of fluid from the cup. A flow control valve assembly is mounted to the training cup spout assembly to permit pressure equilibration.

Abstract: A nipple assembly is removably attachable to a baby bottle via a retainer ring and comprises a nipple having a flow aperture through one end, and a nipple flange structured to support the nipple. A flow control valve assembly is mounted to the nipple flange and extends inwardly from an inner surface of the nipple flange, the flow control valve assembly is structured to allow pressures to equilibrate between the inside and outside of the baby bottle, without allowing fluid to leak therethrough. A training cup spout assembly is removably attachable to a cup and comprises a spout having a spout channel extending therethrough. The spout channel has a dual valve assembly mounted therein to permit flow for drinking, as well as to prevent leakage of fluid from the cup. A flow control valve assembly is mounted to the training cup spout assembly to permit pressure equilibration.

Abstract: A nipple assembly is removably attachable to a baby bottle via a retainer ring and comprises a nipple having a flow aperture through one end, and a nipple flange structured to support the nipple. A flow control valve assembly is mounted to the nipple flange and extends inwardly from an inner surface of the nipple flange, the flow control valve assembly is structured to allow pressures to equilibrate between the inside and outside of the baby bottle, without allowing fluid to leak therethrough. A training cup spout assembly is removably attachable to a cup and comprises a spout having a spout channel extending therethrough. The spout channel has a dual valve assembly mounted therein to permit flow for drinking, as well as to prevent leakage of fluid from the cup. A flow control valve assembly may be mounted to the training cup spout assembly to permit pressure equilibration.

Abstract: A nipple comprising a teat, a mounting flange coupled to the teat defining a valve cavity therein, and a valve positioned with in the valve cavity, in which the valve is configured to equalize differing pressures. A system and method comprising a container and a nipple configured to be selectively and sealingly coupled to the container, in which the nipple further comprises a valve and valve cavity configured to equalize the pressure differences between the ambient environment and interior of the container, in which the valve cavity has a minimum volumetric capacity of 0.9 cubic centimeters, and in which the valve cavity has a stepped triangular cross-section positioned at the bottom of the valve having a minimum wall thickness of 0.8 millimeters and a minimum height of 3.0 millimeters.