There are basically four types of quick disconnect couplings used in liquid cooling applications. They are straight through, single shut-off, double shut-off, and non-spill.
The simplest type of coupling is a straight-through coupling (See Fig. 2). These couplings do not have any internal valves to obstruct fluid flow so they provide minimal pressure loss. External manual shut-off valves are required to prevent fluid loss when disconnecting. Straight-through couplings normally have operating pressures of up to 5,000 psi. This type of coupling is typically used in applications where the loss of coolant when breaking the liquid cooling loop can be tolerated.
Learn more about how Boyd seals and connects liquid systems in our Liquid Management Section.