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A sealing device used to control leakage from the stuffing box of a pump. Mechanical seals are usually made of two extremely smooth flat surfaces, one of which rotates on a shaft. The two flat surfaces are of such close tolerances as to prevent the passage of water between them.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

ADJUSTABLE DIFFERENTIAL

A means of changing the difference between the control cut-in and cut-out points.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

ACTION

Refers to the action of a controller. It defines what is done to regulate the final control element to effect control.

FILTER ELEMENT

The porous device that performs the actual process of filtration. Also known as Cartridge

SHED MODE

A method of demand control that reduces kW demand through shedding and restoring loads.

COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.
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