Bellows sealed valve is a valve that uses a metal bellows to achieve stem sealing. Its core purpose is to solve the zero leakage requirements of high-risk media. The following are specific application areas and features:
1. High-risk media sealing control
Inflammable, explosive and toxic media
Applicable to dangerous gas pipelines such as natural gas, ammonia, liquefied petroleum gas, etc., to prevent leakage from causing safety accidents.
Highly corrosive media
Can handle corrosive fluids such as acids, alkalis, and radioactive substances, such as acid and alkali delivery systems in chemical production.
Highly toxic and rare media
Used in the pharmaceutical and nuclear industries to control cyanide, radioactive agents and other scenes that require absolute sealing.
2. Key points of industrial system
| Industrial | Applications | Advantages |
|---|---|---|
| Petrochemical | High temperature and high pressure pipelines of oil refining equipment and ethylene cracking units. | High temperature resistance (≤425℃), medium erosion resistance |
| Electricity | Power plant steam system, water circulation control (such as main steam isolation valve) | Adapt to high temperature and high pressure steam, avoid aging and leakage of traditional packing |
| Pharmaceutical/Food | Aseptic production line, high purity medium delivery (such as vaccine production). | Eliminate microbial contamination and meet hygiene standards |
3. Special working conditions adaptation
Vacuum and ultra-low temperature environment
Used for semiconductor manufacturing vacuum pump pipelines, liquid nitrogen/liquid oxygen storage and transportation systems to prevent external gas infiltration.
Frequent opening and closing scenarios
The bellows can withstand tens of thousands of telescopic movements and are suitable for process industrial valves that require high-frequency adjustment.
Long-term maintenance-free requirements
The life of metal bellows is more than 10 years, reducing the frequency of shutdown and maintenance (compared with traditional packing valves).
4. Typical valve types and restrictions
Applicable valve types
Mainly designed as stop valves (accounting for more than 80% of the market), a small number of ball valves achieve rotary sealing through spiral groove structures.
Restrictions
The pressure resistance level of the bellows is usually ≤Class 600, and severe vibration and excessive lateral force must be avoided.
