Hydraulics Jargon Buster: L

LAG: The preferred engineering term for delay in response (usually in degrees).

LAMINAR FLOW: Slow movement of fluid in a passage in a relatively straight path along the centre line of the passage.

LEVEL SWITCH: An electro-mechanical device which senses the level of fluid in a chamber and opens or closes a digital switch to indicate a change of state. See LEVEL TRANSMITTER.

LEVEL TRANSMITTER: An electro-mechanical device which senses the level of fluid in a chamber and produces an analogue signal that corresponds with the change of state in the chamber. See LEVEL SWITCH.

LEVERAGE: A gain in output force over input force by sacrificing the distance moved. Mechanical advantage or force multiplication.

LIFT: The extent of the capability of a pump to raise fluid from a lower to higher level at its inlet port without damage to the pump. Normally expressed in feet of water.

LINE: A connection (pipe, tube or hose) between components; a passage for fluid or gas transfer.

LINEAR ACTUATOR: A device for converting hydraulic energy into linear motion; an actuator that directs force in a straight line. A hydraulic cylinder is a linear actuator.

LIQUID LEVEL GAUGE: A gauge used to visually indicate the fluid level in a reservoir or tank.

LOAD: The amount of force or pressure placed on a hydraulic system.

LOCKING BALLS: Other nomenclature “detent balls”. Normally found in the female half of the quick-action coupling, they align with the shoulder groove on the mating male half providing a durable locking mechanism while allowing both coupling halves to swivel and align easily.

LOOP INSTALLATION: The assembly is installed in a loop or “U” shape and is most often used when frequent and/or large amounts of motion are involved.

LUBRICATOR: A device that adds controlled or entered amounts of lubricant into an air system.

LUBRICITY: Ability of an oil or grease to lubricate. The property that diminishes friction and increases smoothness and slipperiness.

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