Glossary of Pump Terms: J

Jacket: The term “jacket” is commonly used in relation to heating or cooling systems in the context of a stuffing box. The heating jacket and cooling jacket refer to the components that provide heating or cooling to the stuffing box, respectively.

Jet: A jet refers to a forceful stream of fluid that emanates from an opening. It is characterized by its high velocity and directional flow.

Jet pump: A jet pump is a type of pump commonly used in residential water supplies. It utilizes the principle of the Venturi effect to create a low-pressure area, which acts as a suction force to draw in water or fluid, allowing the pump to lift and move the fluid.

Jig: A jig is a guiding tool used in manufacturing processes. It helps to ensure the accurate and repetitive cutting or shaping of workpieces by guiding the machine tool or workpiece during the manufacturing operation.

Jockey pump: A jockey pump is a secondary pump typically found in sprinkler systems. It is connected in parallel to the main fire pump and is responsible for maintaining pressure within the sprinkler system. When a fire occurs and a sprinkler activates, reducing the system pressure, the drop in pressure is detected by the controller, which activates the main fire pump.

Joint: A joint refers to the connection point where two or more pieces are joined together. This can be achieved through various methods such as welding or the use of flanges, nuts, and bolts Joints ensure the structural integrity and integrity of fluid containment in a system.

Joule: The joule is a unit of measurement for energy in the International System of Units (SI). It represents the energy required to exert a force of one Newton over a distance of one meter.

Journal: The journal refers to the part of a rotating shaft that is supported by a plain bearing. It is the section of the shaft that comes into contact with and rotates within the bearing.

Journal bearing: A journal bearing is a type of bearing used to support a rotating shaft. It typically consists of a sleeve or cylindrical-shaped bearing that provides a low-friction interface between the rotating shaft and the stationary bearing surface.

Journal box: A journal box is a housing or casing that contains the journal and journal bearing. It provides a protective enclosure for these components, ensuring proper lubrication and support for the rotating shaft.


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