What are the advantages of bellows valves in use?

It is often used in places with strict requirements on valve stem sealing, such as high vacuum applications and nuclear industry. Use bellows instead of or in combination with stuffing boxes on ordinary valves.
It completely eliminates the shortcomings of the common valve stem packing seal aging fast and easy to leak, not only improves the use of energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment. The bellows valve is because of its simple structure and its low price, which makes it so far that it has few "competitors". The only thing that can compete with the diaphragm valve is the so-called bellows valve, also known as a bellows valve.