Pump Glossary S

Shaft packing

Shaft packing is a kind of friction seal or stuffing box to prevent leakage between the pump shaft and the casing. Commonly used shaft seal types include packing seal, mechanical seal, and power seal

Sleeve bearing

Usually manufactured from carbon, Teflon, brass etc., Allows too much axial and radial movement for most mechanical seal applications


The stator is the stationary part of the motor or generator. The stator consists of the stator core, the stator winding, and the seat. The main function of the stator is to generate a rotating magnetic field, while the main function of the rotor is to be cut by magnetic lines in the rotating magnetic field to generate (output) current.


Solids in liquid

Stainless steel

Alloy steels containing a high percentage of chromium

Specific Gravity

A measure of the weight of a liquid. The specific gravity is also called the relative density. The specific gravity of a solid or liquid is the ratio of the density of the substance (completely compacted state) to the density of pure water at 3.98°C (999.972 kg/m3) at standard atmospheric pressure. The specific gravity of a liquid or solid tells whether it sinks or floats in another fluid.

Stuffing box

That portion of the pump that held the packing and now holds the mechanical seal

Suction head

Subtract the cavitation margin of the pump from the local atmospheric pressure, and then subtract the loss along the suction pipe and the vaporization pressure of the water temperature to determine the vertical distance between the pump suction port and the liquid surface to be pumped.
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram