Glossary of Compressed Air Terms :: L :: Glossary Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z L/sec Volume flow rate measured in liters per second Labyrinth compressor A special type of oil free, positive displacement reciprocating compressor, working without piston rings. The seal between piston and cylinder wall is produced by a series of labyrinths. Lacquer A deposit resulting from the oxidation and polymerization of fuels and lubricants when exposed to high temperatures. Similar to, but harder, than varnish. Langelier's index Is a technique for predicting whether water will tend to dissolve or precipitate calcium carbonate. If the water precipitates calcium carbonate, scale forming may result. If the water dissolves calcium carbonate, it has a corrosive tendency. lb Pounds. lb/hr A volume. Pounds per hour. Leak air A crack or hole that accidentally admits a gas or lets it escape. Leak detector ultrasonic An instrument designed to detect the ultrasonic emissions and convert them to audible signal. Lift The distance between the seat and disc seating surfaces when a valve is open. Linear actuator Air cylinder Liner Filter parts that provide protection and support for the filter media. Liquid piston A liquid piston compressor is a rotary compressor in which a vaned rotor revolves in an elliptical casing, with the rotor spaces sealed by a ring of liquid rotating with it inside the casing. Liquid ring rotary compressor A liquid piston compressor is a rotary compressor in which a vaned rotor revolves in an elliptical casing, with the rotor spaces sealed by a ring of liquid rotating with it inside the casing. Load Electrical measurement. The output of one or several electric machines. Load also denotes the power carried by a particular circuit. Loaded A filter element so full of contaminants that no longer can pass rated flow without excessive pressure differential. Load factor Ratio of the average compressor load during a given period of time to the maximum rated load of the compressor. Load time Time period from when a compressor loads until it unloads. Lobe A type of journal bearing in centrifugal air compressors. Low pressure coat In spray painting, the process of applying the final coat of paint at a lower air pressure. Used to uniform a finish or blending. Lubrication A material (such as oil) used between moving parts of machinery to make the surfaces slippery and reduce friction. Lubricator An instrument designed to add lubrication into the compressed air line. Glossary Index A B C D E F G H I J K L M N O P Q R S T U V W X Y Z