Forced-fluid switch

A forced fluid switch, comprising:

• a first plenum in communication with a first port;
• a second plenum in communication with a second port;
• a third plenum in switched communication with the first plenum and the second plenum and in communication with a third port;
• and
• a fourth plenum in switched communication with the first plenum and the second plenum and in communication with a fourth port;
• a first valve assembly configured to switch between the third plenum in communication with the first plenum and the second plenum, the first valve assembly including a first tubular valve seat connecting the first plenum with the third plenum and a second tubular valve seat connecting the second plenum with the fourth plenum, and wherein the first valve assembly includes a first spherical stopper configured to be moved between the first tubular valve seat and the second tubular valve seat;
• and
• a second valve assembly configured to switch between the fourth plenum in communication with the first plenum and the second plenum, the first valve assembly including a third tubular valve seat connecting the second plenum with the third plenum and a fourth tubular valve seat connecting the second plenum with the fourth plenum, and wherein the second valve assembly includes a second spherical stopper configured to be moved between the third tubular valve seat and the fourth tubular valve seat,
• wherein the first, second, third and fourth plenums and the first and second valve assemblies are enclosed within a case forming the forced fluid switch, the enclosing case divided by a first separator dividing the forced fluid switch into a first part and a second part, and wherein a second divider is configured to divide the first part into the first plenum and the second plenum and a third divider is configured to divide the second part into the third plenum and the fourth plenum,
• wherein the four ports penetrate through exterior walls of the case,
• wherein the two valve assemblies of the forced fluid switch connect their respective plenums internally to the exterior walls of the case with a first forced fluid path internal to the case and a second forced fluid path internal to the case,
• wherein in the first forced fluid path, the third plenum is in communication with the first plenum through the first valve assembly and the fourth plenum is in communication with the second plenum through the second valve assembly, and in the second forced fluid path, the third plenum is in communication with the second plenum through the first valve assembly and the fourth plenum is in communication with the first plenum through the second valve assembly, and
• wherein each port provides external fluid communication for its respective plenum, with the first plenum and the second plenum in fluid communication through the first port and the second port external to the forced fluid switch.