Rapid-deflate valve stem and associated systems and methods

A valve stem, comprising:

• a valve body having:
• a central passage extending through the valve body from a proximal end to a distal end;
• and
• a lateral port positioned between the proximal end and the distal end and extending through the valve body into the central passage;
• a pressure set assembly couplable to the distal end of the valve body, the pressure set assembly having:
• a housing having a central pressure set passage extending from a proximal end to a distal end of the housing in communication with the central passage of the valve body;
• a valve set portion positioned within the central pressure set passage near the distal end, the valve set portion having an aperture with a secondary check valve core positioned therein;
• a pressure set portion positioned within the central pressure set passage between the proximal end and the valve set portion;
• and
• a pressure set spring positioned between the pressure set portion and the valve set portion, wherein the pressure set spring biases the valve set portion against the housing to selectively prohibit gas flow from the distal end of the housing through the central pressure set passage;
• and
• a collar surrounding an intermediate portion of the valve body, the collar slidable with respect to the valve body between a first position and a second position;
• a primary seal fixed with respect to the valve body and positioned adjacent to the lateral port toward the proximal end;
• and
• a proximal secondary seal positioned between a proximal end of the collar and the valve body, wherein the proximal secondary seal is fixed with respect to the collar such that the proximal secondary seal moves along the valve body as the collar slides between the first and second positions, and wherein the proximal secondary seal is configured to wipe contaminants toward the proximal end as the collar moves from the first position to the second position,
• wherein,
• when moved to the first position, the collar contacts the primary seal and occludes the lateral port to prohibit gas flow from the central pressure set passage through the central passage and out of the lateral port, and
• when moved to the second position, the collar at least partially opens the lateral port to permit gas flow from the central pressure set passage through central passage and out of the lateral port.