Low-spill coupling assembly

A coupling system for liquid cooling of electronics, comprising:

• a female coupling device having a quick disconnect lock and being configured to releasably receive a male coupling device in a pre-coupled position in which fluid flow is occluded between the female coupling device and the male coupling device, a partially-coupled position, and a fully-coupled position in which fluid flow is provided between the female coupling device and the male coupling device, wherein the female coupling device includes:
• a female main body defining:
• a front opening at a front-most face of the female main body, a sidewall opening positioned rearwardly of front opening and being sized to receive a movable lock member, a first interior shoulder that is positioned rearwardly of the sidewall opening and that tapers inwardly to a first interior bore having a first bore diameter, the first interior bore extending rearwardly from the first interior shoulder for a first bore axial length to a second interior shoulder that transitions to a second interior bore, the second interior bore having a second bore diameter larger than the first bore diameter and having a second bore axial length greater than the first bore axial length, and one or more seal grooves disposed along the first interior bore, wherein both the sidewall opening and a front-most end of the first interior shoulder are positioned axially closer to the front opening of the female main body than to a front-most end of the second larger interior bore of the female main body;
• a stem having a stem head positioned in the first interior bore and configured to remain stationary relative to the front-most face of the female main body, wherein the stem head defines a stem front face that is oriented toward the front opening and that has a stem front diameter greater than half the first bore diameter;
• a valve sleeve movable within the second interior bore relative to the stem head, wherein the valve sleeve is biased by a first coil spring toward a closed position in which the valve sleeve abuts with the second interior shoulder of the female main body and is configured to occlude the first interior bore of the female main body, wherein the valve sleeve is movable to a rear position in which the valve sleeve is entirely rearward of the first interior bore;
• and
• the quick disconnect lock comprising the movable lock member slidable within the sidewall opening of the female main body, an exterior user-adjustable actuator engaged with the movable lock member for actuation of the movable lock member, and a second coil spring positioned entirely forward of the first coil spring at a location between the exterior user-adjustable actuator and the female main body so as to bias the quick disconnect lock toward a locked condition.