Hydraulics Glossary: L

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A glossary of the key terms you may encounter when working with hydraulic systems. Introducing the letter '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 also under 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 also under 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.
A connection (pipe, tube or hose) between components; a passage for fluid or gas transfer.

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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.
A gauge used to visually indicate the fluid level in a reservoir or tank.
The amount of force or pressure placed on a hydraulic system.
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.
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.
A device that adds controlled or entered amounts of lubricant into an air system.
Ability of an oil or grease to lubricate. The property that diminishes friction and increases smoothness and slipperiness.

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