Quick connecting safety coupler

A fluid coupling for connecting a hose to a port, wherein the coupling has a longitudinal coupling axis, and a port end for connecting to the port, and a hose end for connecting to the hose, the coupling comprising:

• an internal body;
• a port cavity at a port end of the internal body for receiving the port therein;
• a valve bore in communication with the port cavity and extending through the internal body to a hose end of the internal body;
• an external body;
• an external body bore extending through the external body, wherein the internal body is slidably supported in the external body bore and can slide from a first position nearer a port end of the external body bore to a second position nearer a hose end of the external body bore;
• a stem located in the valve bore;
• a hose fitting located at a hose end of the stem for coupling to the hose;
• first and second stem seals spaced apart on the stem and located between a port end of the stem and the hose fitting, wherein the stem seals surround the circumference of the stem, and wherein the first stem seal is nearer the port end of the stem than the second stem seal;
• a stem bore in the stem in fluid communication with the hose fitting and with an outer surface of the stem between the first and second stem seals, wherein the stem is movable in the valve bore between a valve closed position, where the first and second stem seals are both in contact with the valve bore and the stem, and a valve open position, where only the second stem seal is in contact with the valve bore, which valve open position allows fluid communication between the hose fitting and the port cavity;
• a rotation limiting member coupled to the stem between the second stem seal and the hose fitting, and slidably coupled to the external body, for limiting the rotation of the stem about the coupling axis with respect to the external body;
• a locking sleeve coupled to the external body and moveable between a port secured position and a port unsecured position, wherein the port is secured into the port cavity when the locking sleeve is in the port secured position;
• and
• a valve handle coupled to the stem and longitudinally moveably coupled the external body for moving the stem between the valve open position and the valve closed position, and wherein the locking sleeve interferes with the valve handle moving to the valve open position when the locking sleeve is in the unsecured position, thereby preventing the valve from being in the valve open position when the locking sleeve is in the unsecured position.