Glossary of Pump Terms: J
Jacket:
Usually refers to the heating/cooling jacket surrounding the stuffing box on some pumps.
Joule:
A metric unit for the measurement of heat. Defined, as the energy required to move one Newton over one meter.
Glossary of Pump Terms: K
Kalrez®:
An “elastomer like” material manufactured by E.I. Dupont that is used to seal most solvents and other aggressive fluids. It is available in several different grades.
Kilowatt:
One thousand watts. The normal unit for work in the metric system.
Kinetic Energy:
Created by a centrifugal pump when the velocity of the fluid is accelerated to the outer rim of the impeller.
The amount of kinetic energy given to the fluid corresponds to the velocity at the impeller vane tip. The faster the impeller revolves, or the bigger the impeller, the greater the energy given to the fluid. This kinetic energy is then harnessed and slowed by the resistance created by the pump volute (casing).
KPa:
A metric unit for pressure. 100 kPa = one atmosphere.
Glossary of Pump Terms: L
Labyrinth seal:
A non-contacting seal utilizing a tortured path for the escape of the fluid. Utilizes a series of pressure drops to reduce the leakage.
Lantern Ring:
A device used to supply lubricant to packing. Usually located in the middle of the packing ring set.
Linear pressure drop:
A straight-line pressure drop across the lapped seal faces. Seldom happens.
Line bearings:
Position the rotor or shaft radially. Normally of the sleeve type.
Lip Seal:
See grease seal.
Lubricant:
Any fluid that will maintain a film thickness of one micron or more at its operating temperature and load.