Shaft Sealing Devices for Horizontal Slurry Pumps

Due to the rotational movement of the pump shaft in horizontal slurry pumps while the pump casing remains stationary, there exists a certain gap at the connection between the shaft and the pump casing. In order to prevent the high-pressure liquid inside the pump from leaking along this gap or to keep external air from entering the pump, it is necessary to have a shaft sealing device for horizontal slurry pumps.

Generally, there are three types of shaft sealing devices for horizontal slurry pumps: packing seal, expeller seal, and mechanical seal. The packing seal employs a stuffing box through which the pump shaft passes. The stuffing box is filled with packing material, such as asbestos rope soaked in oil or coated with graphite. The packing material forms a sealing ring around the pump shaft within the gap of the pump casing.

The mechanical seal consists of a rotating element, commonly known as the “dynamic ring,” which is mounted on the pump shaft, and a stationary element, known as the “static ring,” which is fixed on the pump casing. These two rings have flat faces that are pressed against each other by the force of a spring, allowing them to rotate relative to each other. Mechanical seals are suitable for applications requiring higher sealing requirements and for conveying corrosive slurries.