Low-spill coupling assembly

A low-spill coupling system, comprising:

• a female coupling device configured to releasably receive a male coupling device, wherein the female coupling device includes:
• a female main body at least partially defining:
• a front opening at a front-most end of the female coupling device, a first interior shoulder at the front opening that extends rearwardly and 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 having a second bore axial length greater than the first bore axial length and a second bore diameter greater than the first bore diameter, forward and rear bore seal grooves formed disposed in the first interior bore such that at least the forward bore seal groove is positioned at a location axially closer to a rear-most end of the first interior shoulder than to a front-most end of the second interior shoulder, wherein the female main body has a continuously solid exterior sidewall that extends rearwardly from the front-most end of the female coupling device to surround all of the front opening, the first interior shoulder, the first interior bore, the second interior bore and the front and rear bore seal grooves;
• a rear exterior thread configured to be coupled to a fluid line and positioned rearwardly of an exterior ring seal, wherein the female coupling device includes exterior opposing flat surfaces positioned forward of the rear exterior thread;
• a stem including a base end that defines a stem rear width greater than the second bore diameter of the second interior bore of the female main body, a stem head that carries a stem seal positioned in the first interior bore and that defines a stem front face oriented toward the front opening, wherein the stem head is stationary relative to the front-most end of the female coupling device, wherein the stem front face is oriented toward the front opening at a first axial length from the front-most end of the female coupling device;
• a forward bore seal seated in the forward bore seal groove along the first interior bore and a rear bore seal seated in the rear bore seal groove along the first interior bore such that the rear bore seal is positioned further from the front opening than the forward bore seal and radially outward of the stem seal;
• and
• a movable sleeve that defines a sleeve front face oriented toward the front opening and is configured to slide in a rearward direction relative to the stem head such that the stem seal is releasably engageable with an interior circumferential sleeve surface of the sleeve and the rear bore seal is releasably engageable with an exterior circumferential sleeve surface of the sleeve, wherein the movable sleeve is spring biased toward a closed position in which the sleeve front face is aligned with the stem front face and in which the movable sleeve is configured to abut with the second interior shoulder of the female main body so as to engage with both the rear bore seal and the stem seal, wherein when the movable sleeve is in the closed position, both the sleeve front face and the stem front face are positioned axially rearward of the forward bore seal and axially forward of the rear bore seal, and wherein the movable sleeve is configured to slide in the rearward direction such that, when the female coupling device releasably receives the male coupling device in a fully-coupled position, the stem seal is configured to disengage from both the movable sleeve and the male coupling device and the rear bore seal is configured to disengage from the movable sleeve.