The failure of the rubber ring is related to the way of use. Usually, high pressure is one of the reasons for the failure of the O-ring formed by the imported mechanical seal. When the O-ring becomes rectangular or the ring becomes hard, it is necessary to adjust the compression amount, otherwise it will generate heat. .

(1) Thermal cracking;

(2) The ceramic ring is broken;

(3) Notches;

(4) The peeling of the plating layer.

The over-tight assembly of the ceramic ring is the main cause of cracking, and the assembly of the mechanical seal that is not resistant to corrosion is also a common cause.

Due to the different linear expansion rates between the coating material and the base material, cracks will appear on the ring surface when the temperature rises in the dyeing and finishing mechanical seal, and the stellite alloy is particularly serious. Among the higher-level coating materials, cobalt-based tungsten carbide is inferior to nickel-based coatings. Cooling the sealing surface can effectively prevent thermal cracking. The solid particles remaining on the sealing surface often damage the surface. For example, sand particles on the grinding wheel during grinding will damage the surface of the hard ring, causing the sealing surface to open or on the sealing surface. Crystals are formed from time to time, and after grinding the graphite ring again, the abrasive will be embedded on the surface of the graphite ring.

The failure of the rubber ring is related to the way of use. Usually, high pressure is a reason for the failure of the pressed O-ring. When the O-ring becomes rectangular or the ring becomes hard, it is necessary to adjust the compression amount, otherwise it will generate heat.

Therefore, it is necessary to understand the operating temperature of a synthetic rubber. The swelling of synthetic rubber rings is mostly caused by chemical attack. They all have their own characteristics. For example, fluoroelastomers are resistant to higher temperatures, while ethylene and propylene ○-shaped rings will swell when used in petroleum lubricants. Ozone can affect nitrile Rubber is corrosive, so do not install nitrile rubber products in the motor, so high temperature and chemical corrosion are usually the main reasons for hardening and cracking of rubber products.

The rubber parts are cut and nicked on the surface during installation, which are also common reasons for seal failure. The old fixing screws, keyways, spline shafts, sharp shoulders and other signs on the shaft will damage the rubber parts.


Established in 2003, Ningbo Leap Seals Industry Co., Ltd is a professional China Mechanical Seals Manufacturers and Mechanical Seals Components Suppliers Manufacturers. The products are made of silicon carbide, tungsten carbide, stainless steel ,ceramic and so on. our wholesale mechanical Seals Components are widely used in various industry fields, except for complete set of mechanical seals and their replaceable accessories, we also welcome your customized tungsten carbide, silicon carbide, ceramic products, and stainless steel such as ring, sleeve, oil seat, and all kinds of irregular or complex products, Ningbo Leap industry want to accelerate co-development with clients from all over the world and create our glorious future together.