Centrifugal pumps are indispensable fluid transmission tools in power plant production, and play a vital role in various locations such as steam turbines and generators. However, the leakage problem at the pump shaft has always plagued the reliability and safety of the pump. Mechanical seal ZU44-45, as an efficient sealing solution, is widely used in centrifugal pumps to prevent leakage at the pump shaft.

The design principle of centrifugal pump mechanical seal ZU44-45 is based on the concept of “dry operation”, that is, a thin fluid film is formed on the sealing surface, which plays a role in lubrication and cooling, and also prevents fluid leakage. The core of the seal lies in the precise matching of the dynamic ring and the static ring. The two components remain in contact when the pump shaft rotates, forming a dynamic sealing interface. Under normal working conditions, the dynamic ring rotates with the pump shaft, while the static ring is fixed, and the end faces of the two are closely fitted, relying on springs or hydraulic balance forces to maintain contact pressure, and can maintain a good sealing effect even when the pump shaft vibrates or is eccentric.

ZU44-45 mechanical seal is mainly composed of components such as dynamic rings, static rings, springs, and sealing rings. The moving ring is made of carbide and is installed on the pump shaft and rotates with the shaft. Its end face is precision machined to have extremely high flatness and finish so as to form a sealing surface with the stationary ring. The stationary ring is fixed on the pump housing and is usually made of elastic material or graphite. Its end face fits tightly with the end face of the moving ring to form a sealing interface together. The spring is used to provide the necessary preload to ensure close contact between the moving ring and the stationary ring. The design of the spring can adapt to different working conditions, including single spring, multiple springs or bellows springs. The sealing ring usually adopts O-ring or V-ring, and different materials are selected according to the application conditions.

In order to ensure the long-term performance of the ZU44-45 mechanical seal, it is very important to regularly check the wear of the sealing components and replace the worn parts in time. In addition, keeping the sealing cavity clean and avoiding the entry of solid particles is also an important measure to maintain the sealing performance. Before starting the pump, make sure that the pump housing is filled with liquid to avoid damage to the sealing surface caused by dry running.

In summary, centrifugal pump mechanical seal ZU44-45 effectively prevents leakage at the pump shaft through its unique structural design and precise manufacturing process, improving the operating efficiency and safety of the pump. In practical applications, reasonable selection of sealing materials, correct installation and regular maintenance will greatly extend the service life of the seal and reduce the maintenance cost of the equipment.


Yoyik offers various types of valves and pumps and its spare parts for power plants:
Pump driven screw DLZB820-R64
AST solenoid valve C9206013
Pneumatic double slide valve Z644C-10T
Bellows valves WJ10F2.5P
main cooling water pump YCZ50-250C
Actuator striker arm / drive coupling P22060D-01
Skeleton oil seal 589332
Drain Valve M-3SEW6U37/420MG24N9K4/V
mannual bellows globe valve WJ20F1.6P
Bellows valves WJ50F1 6P-II
steam turbine trip solenoid valve F3DG5S2-062A-50-DFZK-V
Bellows valves KHWJ100F-1.6P
solenoid valve J-110VDC-DN6-UK/83/102A
Large flow helical gear oil pump CB-B16
multistage centrifugal water pump YCZ65-250B
2 way solenoid valve 12v 4WE6D62/EG220N9K4/V
Pressure relief valve YSF16-55/130KKJ
trip overspeed cover plate F3CG2V6FW10
main sealing oil pump coupling KF80KZ/15F4
water in oil sensor detector OWK-1G