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Cryogenic valves are made for very cold temperatures. They handle low-temperature liquids like liquid oxygen, nitrogen, hydrogen, and liquefied natural gas. Pipelines carrying these liquids use cryogenic valves to control flow. They are widely used in oil and gas, chemical, and food industries.
Cryogenic valves are built to handle fluids with pressures up to 52 bar. They work at temperatures as low as -196℃. Handling these fluids requires great care. Changes in pressure or temperature can cause serious accidents.
Not all valves work for cryogenic uses. Some lack the right features. Common cryogenic valves include ball, butterfly, gate, globe, and relief valves.
These are popular for cryogenic uses. They offer tight shut-off. They wear out easily, though. They are best for places with free flow.
Cryogenic butterfly valves are great for quick open and close actions.
Like other cryogenic valves, gate valves have a long neck bonnet. Even when fully open, they cause little pressure drop.
To understand how they work, study their structure. A key feature is the long neck bonnet design. The long neck bonnet has several roles:
1. Protecting Packing Gland Area: It shields parts like packing glands from freezing or losing flexibility in extreme cold.
2. Insulation Application: The long neck allows insulation to wrap around it. This keeps outside heat from reaching cold areas in pipelines.
3. Ease Maintenance/Replacement: It makes fixing or replacing parts easier.
The long neck bonnet protects the valve’s packing gland. At cryogenic temperatures, packing materials lose flexibility. Their sealing ability drops. Leaks may freeze between the packing and valve stem. This can harm valve operation. Stem movement might scratch the packing. This causes big leaks. To avoid this, the packing area must stay above 8°C.
The long neck structure blocks outside heat from entering the valve body. This design saves internal cold energy. It keeps the fluid stable in cryogenic conditions.
The long neck design allows quick part replacement through the bonnet. In cryogenic systems, pipelines and valves are often in a cold box. The long neck lets the valve stem and top parts stick out through the cold box wall. This allows maintenance or part swaps without taking apart the valve or breaking pipe welds.
· Oil and Gas Industry: Cryogenic valves are vital for liquefied natural gas (LNG) and other cold hydrocarbons.
· Chemical Industry: They handle substances like liquid ethylene and liquid hydrogen in chemical processes.
· Aerospace Industry: They manage liquid oxygen (LOX) and liquid hydrogen (LH2). These are rocket and spacecraft fuels.
· Medical Field: Cryogenic valves ensure safe storage and distribution of medical gases like liquid oxygen in hospitals.
· Power Generation: In power plants using liquefied gases, these valves control flow well in extreme conditions.
Cryogenic valves use long neck bonnets primarily to keep the valve's packing and stem seal away from the extreme low temperatures of the process fluid, preventing freezing and ensuring reliable sealing.
With over 20 years of expertise, FLUIDO makes valve solutions for many industries. It ensures top product quality and great customer service.FLUIDO offers a wide range ofproducts. These include butterfly valves, ball valves, gate valves, and custom options. All products are tested strictly. They meet global ISO9001 standards. This ensures dependability in tough settings.
