Carbon Ceramic Mechanical Seal

It is chemically inert and can be applied to nearly any product.

Carbon ceramic mechanical seal. Often called teflon r. This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators turbines compressors centrifuges and blowers. Common types of mechanical seal face. The mechanical seals provided by bell and gossett have stainless steel metals buna elastomers a 99 5 pure aluminum oxide ceramic stationary seal face and a carbon rotating face.

These seals work well with the temperatures mentioned above and a ph neutral range of 7 0 9 0. Once in a while the ph is too high for the carbon ceramic seal material. The role of the mechanical carbon differs with this high end mechanical seal and the resulting recipe is unique for these types of seals. Overview of ceramic seal materials.

The seat is comprised of the seat and the gasket. It reduces leakage between the pump and the surroundings to an absolute minimum. Systems with high ph levels. Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last.

The majority of seals used in pumps are typically carbon ceramic. 3 4 type 21 buna carbon vs. In most applications carbon ceramic seals work fine but there are certain circumstances when a different type of material for the mechanical seal should be specified. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1.

Ceramic generally a 99 5 aluminum oxide offering excellent wear characteristics due to it s hardness. Tion of a mechanical seal. Carbon tungsten carbide ceramic silicon carbide chrome oxide stellite ni resist and phosphor bronze. Ceramic cannot however handle the thermal shocks don t drop them that ni resist or 17 4 seats can.

They come furnished as two pieces the seal and the seat. For use in waste water boiler feed and compressor pumps these seals have an extra long spring that accommodates variations in seal cavity length. Machine lapping is the production method of lapping mechanical seal faces. The mechanical shaft seal is essentially a throttle arranged around the shaft.

Carbon is also a critical component in some of the hard face materials used in mechanical seals because it combines with metals at high temperatures to form metallic carbides. The seal is comprised of the case spring diaphragm and washer which come locked together as one piece. Carbon is standard on 316ss pumps. As previously stated a pump with a through shaft is not leakproof.

Most hvac applications maintain a ph from 7 0 to 9 0. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal. 3 4 type 21 fluorocarbon ceramic vs. The most common types of seal faces are.