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 sealed bottom side and a first threaded bore situated at the central longitudinal axis of the cylindrical tank;
• 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 surface, a second threaded bore, and a threaded fill port with a threaded plug, wherein the threaded fill port extends through the exterior surface to the interior surface at a location offset from the center point, and wherein the threaded bore is situated in the interior surface at the center point of the top cap;
• an inlet port extending through at least one of the sealed bottom side and the top cap;
• an outlet port extending through at least one of the sealed bottom side and the top 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 a pair of ends, a middle section between the pair of ends, and an interior sidewall having a sidewall diameter, wherein the cylindrical tank has a central longitudinal axis;
• a pair of caps each comprising a head and a flange, wherein the head has a first diameter and is comprised of an exterior surface, an interior surface, and a perimeter side, wherein the flange has a second diameter and is comprised of an annular groove, 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 for each one of the pair of caps is respectively positioned proximate to a corresponding one of the pair of ends of the cylindrical tank, and wherein the flange extends a length from the head into the corresponding pair of ends of the cylindrical tank proximate to the interior sidewall;
• an inlet port extending through either one of the pair of caps, wherein the inlet port fluidly connects the interior surface with at least one of the exterior surface and the perimeter side, and wherein a pressurized air enters the cylindrical tank through the inlet port;
• an outlet port extending through either one of the pair of caps, wherein the outlet port fluidly connects the interior surface with at least one of the exterior surface and the perimeter side, and wherein the fluid flows out of the cylindrical tank through the outlet port;
• a tie rod comprising a first end, a second end, and a center section between the first end and the second end, wherein the first end and the second end are removably connected to the pair of caps through a pair of fasteners, respectively, wherein at least one of the pair of caps moves axially towards the pair of ends to a sealed arrangement, and wherein at least one of the pair of caps moves axially away from the pair of ends to an unsealed arrangement;
• and
• a pair of annular seals respectively fitted within the annular groove of the corresponding pair of caps, wherein each of the annular seals 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.