A pressure regulated volume exchange container includes a container body for holding both a first fluid and a second fluid, the container body defining a first volume portion and a second volume portion, a movable barrier disposed within the container body, the barrier configured to adjust the size of the first and second volume portions, an outlet in the container body through which the first fluid is extracted from the first volume portion, an inlet in the container body through which the second fluid is introduced into the second volume portion, and, an actuator mechanism operably connected to the movable barrier, the mechanism for moving the barrier within the container body in response to extraction of fluid from, or introduction of fluid to, the container body, wherein said actuator mechanism moves said movable barrier so as to maintain a predefined pressure within the first volume portion.

A water tank for operation in an aircraft includes a rigid tank shell, and a pressure compensation mechanism to equalize a pressure inside of the rigid tank shell with an environment. The pressure compensation mechanism includes a shutoff member to move between a closed position, a first open position allowing air to enter the rigid tank shell and a second open position allowing air to leave the rigid tank shell.

A water tank for operation in an aircraft includes a rigid tank shell, and a pressure compensation mechanism to equalize a pressure inside of the rigid tank shell with an environment. The pressure compensation mechanism includes a shutoff member to move between a closed position, a first open position allowing air to enter the rigid tank shell and a second open position allowing air to leave the rigid tank shell.

A storage tank inner wall and floating disc totally enclosed apparatus includes a tank body, floating disc, pressure relief balance structure and a flexible sealing body structure, wherein the floating disc is arranged in the tank body, the edge of the floating disc is provided with an outer frame, the outer frame is provided with a plurality of sealing structures, the top of the inner wall of the tank body is provided with an annular support, one end of the flexible sealing body structure is fixedly connected with the annular support, the other end of the flexible sealing body structure is fixedly connected with the outer frame, one end of the pressure relief balance structure is sequentially and fixedly connected with the flexible sealing body structure and the annular support, and the joint of the annular support is provided with a through hole.