What Is Quick Disconnect (QD)?_
A quick disconnect (QD) is a self-sealing, dripless coupling used to connect and disconnect liquid-cooling lines between the rack manifold and a GPU compute or switch tray. QDs let technicians service a tray without draining the loop, and are a mandatory part of every direct-to-chip liquid-cooled rack such as the GB200 and GB300 NVL72.
Technical Details
QDs come in blind-mate and manual variants. Blind-mate QDs engage automatically as a tray slides into the rack, aligning and sealing the supply and return ports in one motion; manual QDs are hand-connected with a push-to-connect or threaded action. Both use dual-shutoff valves that close on both halves at separation, so neither the tray nor the manifold drips. Selection criteria include flow coefficient (Cv) sized to the tray's heat load, pressure rating above the loop's operating and test pressure, wetted-material compatibility with the specified coolant (typically a PG25 water-glycol blend), and spill volume per disconnect. During installation every QD must be verified fully seated and leak-free under the rack's pressure/leak test before energization.
How Leviathan Systems Works with Quick Disconnect (QD)
Leviathan Systems connects and leak-tests every quick disconnect on the racks it deploys, verifying full seat and zero drips during the liquid-loop commissioning sequence.
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