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Laminar flow

A flow with, at macroscopic level, parallel layers is referred to as laminar flow. A random exchange ...

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Law of congruence

The law of congruence describes the congruity between two states or circumstances (see also Pump ...

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LCC

The abbreviation LCC stands for "life cycle costs".

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LCD

LCD stands for "Liquid Crystal Display". It is a term that describes an electronic display for ...

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Leakage loss

Leakage loss refers to the volume flow rate leaking from the shaft seals (QL).

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LED

LED stands for "Light Emitting Diode". It is a semiconductor diode that produces a clearly defined ...

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Level

The term level is used in metrology to characterise the level of a physical measurand. It is used in ...

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Life cycle costs

Life cycle costs (also see LCC) are the total costs incurred throughout the service life of a pump ...

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Lift check valve

The lift check valve is a valve which prevents the suction line from running empty, e. g. after the ...

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Lined pump

A lined pump is also referred to as a slurry pump.

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Liquefied gas pump

The liquefied gas pump is a centrifugal pump used for handling liquefied hydrocarbons, such as ...

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Liquid-metal pump

The liquid-metal pump is a centrifugal pump which because of its design is capable of handling liquid ...

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Liquid ring pump

The term liquid ring pump describes a group of pumps which are used as rotary positive displacement ...

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Live-zero signal

The live-zero signal is a standard signal that serves as a current or voltage signal for the analog ...

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LNG

LNG stands forliquefied natural gas. It is cooled to −161 °C (boiling point at atmospheric pressure) ...

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Load profile

The term load profile relates to structural durability and is the sum total of all loads, induced by ...

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LON bus

LON stands for "Local Operating Network", and a LON bus refers to an open bus system that allows ...

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Loop

A loop is a closed circuit (also see Closed-loop test).

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Loss coefficient

The loss coefficient (ζ) is a dimensionless number (characteristic coefficient) to calculate the head ...

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Low flow operation

In low flow operation the volume flow at the current operating point is lower than that at the design ...

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Low flow protection

Low flow protection devices are intended to protect the pump against impermissible low flow operation, e.

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Low-pressure pump

Low-pressure pumps are centrifugal pumps with heads up to 80 m (e.g. chemical pumps). Alternatives ...

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Low Voltage Directive

Within the EU, the most important document for regulating the safety of electrical devices, apart ...

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LPG

LPG stands for liquefied petroleum gas and is a liquefied form of petroleum gas, or liquefied gas in ...

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Lubricating oil pump

Lubricating oil pumps are used to supply oil to lubrication points, e.g. for plain bearings. In the ...

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