Ningbo Donglian Mechanical Seal Co.,Ltd. products

A self-contained unit consisting of a sleeve,seal and a gland plate is called cartridge mechanical seal or cartridge seal.The plastic impeller in the cartridge  seals rotates to make the fluids move in the same directions and help to prevent temperature from increasing

Mechanical seals are always applied in water pumps,so they are also named water pump mechanical seals or water pump seals or pump seals or pump mechanical seals. Mechanical seals DY816, the main materials are tungsten carbide seal face vs tungsten carbide seal ring to resist the friction caused by the sands or grains in the water

the sintering method of pressureless sintered silicon carbide seal rings/faces is that silicon carbide powder with a certain amount of B and C is sintered in a vacumme furnace in a high temperature where B is dissolved into sic to lower the cristal boundary energy and C can remove SO2 to improve the surface energy.Compared to reaction bonded silicon carbide seal faces/rings, they are better in the resistance to corrosion in the extremely strong acids and alkali.

The two most common variations of tungsten carbide seal faces/ring are cobalt bound and nickel bound. the seal faces/rings of Nickel bound tungsten carbide is more corrosion resistant although the seal faces/rings of the cobalt bound tungsten carbide is more than adequate for most services. Neither is as good as alumina. a tungsten carbide seal face/ring has a very high compressive and tensile strength,a high modulus of elasticity. The mechanical seals with tungsten carbide seal faces or rings can be used in pumps operating in fluids with sands or solids.

The sleeves/bushes and shafts of ceramic 99% ceramic 99.5% are widely used in the magnetic pumps, shield pumps, multistage pumps, hydraulic pumps, chemical pumps, centrifuges and so on. ceramic 99% shaft & sleeve/bush/bushings: customized shafts and sleeves/bushes/bushings

Silicon carbide shafts are designed to save wear and tear when the shafts rotates and basically work as bearings. There are two silicon carbide sintering methods: pressureless sintering and reaction bonded sintering. Both of them are characterized with good resistance to corrosion and friction and endurance of high temperature in spite of some differences in the property. They can be designed for shafts used in mechanical products requiring high precision and sealing. Silicon carbide shafts are used in high pressure pumps, magnetic pumps and shield pumps etc.

Two silicon carbide bush/bushing/sleeve sintering methods:pressureless sintering and reaction bonded sintering are applied in our compnay. The silicon carbide bushes/bushings/sleeves sintered in different way have different chemical and physical properties and the comprehensive performance of pressureless sintered silicon carbide/ssic is better than reaction bonded silicon carbide/sic?

The bronze bushes/bushings/sleeves are made by centrifugal casting relating to the speed importantly and two points should be taken into consideration: the speed should ensure the metal liquids to form a cylinder colour and rotate with the shaft; secondly make use of the centrifugal forces to ensure the inside quality to avoid the defectives of  the shrinkage, porocity, inclusion and so on. The materials have tin bronze, aluminium bronze, and special bronze, which need different temperatures