A valved container assembly comprising a container for containing a fluid, the container extending in an axial direction and having an open front end, a valve disposed in the container； and a plunger element disposed axially rearward of the valve. The plunger element is axially moveable in the container and a first volume is provided in the container between the plunger element and the valve, wherein the plunger element is configured to increase a pressure of the fluid in the first volume upon axial movement of the plunger element relative to the valve. The valve comprises a seal fluidly sealing the valve to an interior of the container along an entire perimeter of the valve, and a channel bypassing the seal, the channel having a first opening in fluid communication with an atmosphere outside of the valved container assembly and a second opening selectively sealed from the first volume by a resilient seal. The resilient seal is moveable between a sealing configuration and an open configuration to selectively seal the channel from the first volume, wherein in the sealing configuration the resilient seal fluidly seals against the container to fluidly seal the valve to the container so as to fluidly isolate the channel from the first volume, and in the open configuration the resilient seal does not fluidly seal against the container to fluidly seal the valve to the container so that the second opening of the channel is in fluid communication with the first volume. The resilient seal is moveable from the sealing configuration to the open configuration upon the pressure of the fluid in the first volume exceeding a first pressure threshold.
