3 4 type 21 buna carbon vs.
Carbon ceramic mechanical seal.
The most common types of seal faces are.
Ceramic standard on cast iron pumps.
Overview of ceramic seal materials.
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.
As previously stated a pump with a through shaft is not leakproof.
This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators turbines compressors centrifuges and blowers.
Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1.
Systems with high ph levels.
Ceramic generally a 99 5 aluminum oxide offering excellent wear characteristics due to it s hardness.
Carbon is standard on 316ss pumps.
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.
Common types of mechanical seal face.
Tion of a mechanical seal.
3 4 type 21 fluorocarbon ceramic vs.
The seat is comprised of the seat and the gasket.
They come furnished as two pieces the seal and the seat.
Once in a while the ph is too high for the carbon ceramic seal material.
Machine lapping is the production method of lapping mechanical seal faces.
Ceramic cannot however handle the thermal shocks don t drop them that ni resist or 17 4 seats can.
The seal is comprised of the case spring diaphragm and washer which come locked together as one piece.
Carbon tungsten carbide ceramic silicon carbide chrome oxide stellite ni resist and phosphor bronze.
Often called teflon r.
It reduces leakage between the pump and the surroundings to an absolute minimum.
Most hvac applications maintain a ph from 7 0 to 9 0.
The mechanical shaft seal is essentially a throttle arranged around the shaft.
For use in waste water boiler feed and compressor pumps these seals have an extra long spring that accommodates variations in seal cavity length.
Kemet lapping systems are used in both manufacturing and reconditioning processes.
The role of the mechanical carbon differs with this high end mechanical seal and the resulting recipe is unique for these types of seals.
Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last.
It is chemically inert and can be applied to nearly any product.
These seals work well with the temperatures mentioned above and a ph neutral range of 7 0 9 0.
Carbon ceramic ni resist 17 4 silicon carbide tungsten carbide gfptfe glass filled ptfe.
