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