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Quick Disconnect Couplings Terms

Air Inclusion – Ambient air that is forced into a system during the connection of quick disconnect coupling mates.

Brinelling – Grooves or dimples that are worn into the shoulder of a male half. These deformations are engendered by the locking balls of a female body.

Break-Away Clamp – A device that clamps to hold the sleeve of the quick disconnect coupling, which permits movement of the body. The movement is either forward within a single- or double-acting sleeve upon disconnect, or backward within a double-acting sleeve upon connection.

Connector – Any device that is used to join two or more parts together. In quick disconnect couplings, the male tip is often referred to as the connector.

Connect-Under-Pressure Rating – The designation given to a coupling that refers to its ability to be connected with applied pressure from one or both sides of the hosing.

Coupler – A part used to connect multiple pieces together. Female acceptors are referred to as couplers in quick disconnect couplings.

Double-Acting Sleeve – A sleeve that allows for pull-to-disconnect and push-to-connect.

Dust Cap – A removable device that protects the male tip from everything but contamination when it is disconnected from the female body.

Dust Plug – A removable device that protects the female body from everything but contamination when it is disconnected from the male nipple.

Female Body – The accepting half of the coupling. The female body consists of an opening that contains locking balls to keep the male end in place.

Flow Checking – Also called “ball checking,” “lock-up” or “check-off,” it is the closure of the male tip half valve during high flow conditions, such as the rapid lowering of a heavy loader.

Inside Diameter (ID) – The distance measured from an inner surface of a quick disconnect coupling to the innermost point directly opposite the original mark. Equal inside diameters between connectors and hosing ensure equivalent flow rates throughout the system.

Interchange – The variations in locking design between internal coupler mechanisms and external nose configurations.

Locking Balls – A series of small, circular-shaped objects that project and retract from a female body. Locking balls allow for the insertion and withdrawal of the male nipple.

Male Tip – The nipple-shaped coupling half. The male tip is inserted into a female body and kept in place by locking balls.

National Taper Pipe Thread (NPT) – A standardized groove design for threaded parts for the United States.

Pivot Joint – A connector assembly that is able to turn in multiple directions.

Poppet Valve – A machined, self-aligning valve that typically offers higher flow than ball valves. Elastomers are incorporated into poppet valves to provide a positive seal upon disconnect and to prevent low pressure leakage.

Pounds Per Square Inch (psi) – A unit of measure of pressure. The maximum rated psi for quick disconnect couplings must meet or surpass that of the other system components to ensure reliable performance.

Spillage – Fluid or air loss in a system due to the disconnection of a coupling device.