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