What is the cause of the water pump mechanical seal leakage

Pump mechanical seal leakage fault is one of the most prone to failure in pump failure, so the water pump mechanical seal also belong to the water pump is one of the key parts in the component, model selection of the water pump mechanical seal material must be appropriate to the user conveying liquid medium, usually water pump factory are some manufacturer is nitrile butadiene rubber fluorine rubber mechanical seal mechanical seal, if the corrosion is serious to choose four fluorine material mechanical seal.

Steps/pump maintenance methods:

1, mechanical seal leakage of the first possibility is machine dynamic and static ring sealing surface wear. Machine caused by dynamic and static ring sealing surface wear of six aspects reasons:

2, installation is too tight. Observing the mechanical seal ring plane, such as severe burning phenomenon, flat black and deep traces, sealing rubber harden and loss of elasticity, the phenomenon is caused by installation too tight. The solution: adjust the installation height, the impeller is installed, with screwdriver out spring, spring has the strong tension, loosen after reset, 2-4 mm movement distance.

3, installation is too loose. Observe the machine moving and static ring sealing surface, the surface has a very thin layer of scale, can wipe, basic no wear surface, which is caused, poor lose elasticity and spring assembly or motor axial channeling move.

4, poor water quality containing particles. Due to poor water quality, contains small particles and hydrochloride content in medium high, in the shape of abrasive wear machine sealing plane or strain the phenomenon such as surface groove, ring groove. The solution: to improve the hydraulic or medium, more replacement closure.

5, dry grinding damage caused by the water running. This phenomenon found in the bottom valve type installation forms inlet negative pressure, there is air inlet pipe, inside the pump chamber, air pump after startup, friction generated when the high-speed operation of high temperature by the machine and to cool, check machine, spring tension is normal, the friction surface burning black, rubber harden craze. The solution: although way and the air inside the pump cavity, replacement of mechanical seal.

6, cavitation. Cavitation erosion is mainly produced in heat pumps. Since the medium is hot water, the water temperature is too high to produce steam pipe of the gas entering the pump cavity, this section of the vapour cannot be ruled out, resulting in lack of operation, machine sealing failure, dry grinding cavitation automatic exhaust valve, a replacement.