Fluid container with pressure seal

A container for exchanging a fluid under pressure;

• comprising:
• a cylindrical tank comprising an upper end, a lower end, a middle section between the upper end and the lower end, and an interior sidewall, wherein the cylindrical tank has a central longitudinal axis, wherein the lower end is comprised of a first threaded bore situated at the central longitudinal axis of the cylindrical tank and a sealed bottom side;
• a top cap having a center point aligned with the central longitudinal axis of the cylindrical tank, and comprising a perimeter side, an exterior surface, an interior space, a second threaded bore, a threaded fill port with a threaded plug, and at least one process port, wherein the threaded fill port extends through the exterior surface to the interior space at a location offset from the center point, wherein the access port fluidly connects at least one of the exterior surface and the perimeter side with the interior space, and wherein the threaded bore is situated in the interior space at the center point of the cap;
• an annular seal situated between the top cap and the upper end of the cylindrical tank;
• and
• a tie rod comprising a top threaded end, a bottom threaded end, and a center section between the top threaded end and the bottom threaded end, wherein the tie rod has a longitudinal axis in line with the central longitudinal axis of the cylindrical tank, wherein the bottom threaded end is screwed into the first threaded bore, wherein rotating the top cap in a first direction relative to the cylindrical tank with the second threaded bore engaged with the top threaded end axially pulls the top cap toward the upper end of the cylindrical tank and compresses the annular seal to form a sealed arrangement, and wherein rotating the top cap in a second direction relative to the cylindrical tank with the second threaded bore engaged with the top threaded end axially pushes the top cap away from the upper end of the cylindrical tank to an unsealed arrangement.

A container for exchanging a fluid under pressure;

• comprising:
• a cylindrical tank comprising an upper end, a lower end, a middle section between the upper end and the lower end, and an interior sidewall having a sidewall diameter, wherein the lower end is comprised of a sealed bottom side;
• a top cap comprising a head and a flange, wherein the head has a first diameter and is comprised of an exterior surface, an interior space, a perimeter side, a threaded fill port with a threaded plug, and at least one process port, wherein the threaded fill port extends through the exterior surface to the interior space, wherein the flange has a second diameter and is comprised of an annular groove, wherein the process port fluidly connects at least one of the exterior surface and the perimeter side with the interior space, wherein the first diameter is greater than the second diameter and forms a shoulder section between the head and the flange, wherein the shoulder section is positioned proximate to the upper end of the cylindrical tank, and wherein the flange extends a length from the head into the upper end of the cylindrical tank proximate to the interior sidewall;
• a tie rod comprising a top end, a bottom end, and a center section between the top end and the bottom end, wherein the top end and the bottom end are removably connected to the top cap and the sealed bottom side through a pair of fasteners, respectively, wherein the top cap moves axially towards the upper end of the cylindrical tank to a sealed arrangement, and wherein the top cap moves axially away from the upper end of the cylindrical tank to an unsealed arrangement;
• and
• an annular seal fitted within the annular groove of the top cap, wherein the annular seal comprises a first portion positioned within the annular groove and a second portion protruding a radial distance out of the annular groove to a third diameter, wherein the second portion is in contact with and radially compressed by the interior sidewall in the sealed arrangement, and wherein the third diameter is greater than the sidewall diameter in the unsealed arrangement.