Characteristics of bellows globe valve
Release date:
2022-09-13
What are the main components of a bellows globe valve? Which parts of the bellows globe valve are more critical? Let's take a look together! The main function of the bellows globe valve is to replace the packing seal with a bellows seal. The bellows seal is highly reliable and can be used in toxic media or gases, such as preventing gas leaks.
Bellows Globe Valve What are the main components? So which parts of the bellows globe valve are more critical? Let's take a look together! Bellows Globe Valve Its main function is to replace the packing seal with a bellows seal. The bellows seal is highly reliable and can be used in toxic media or gases, such as preventing gas leakage.
The key component of the bellows seal globe valve is the metal bellows. The lower end is welded to the valve stem assembly by automatic rolling welding, and the upper end is welded to the connecting plate by automatic rolling welding, forming a metal barrier between the fluid medium and the atmosphere to ensure zero leakage of the valve stem. The valve disc and valve body sealing surfaces are ground and pressure tested after assembly, all achieving zero leakage. As an auxiliary seal, the packing gland is still retained above the bellows to improve reliability. The metal bellows of high-pressure valves use a multi-layer structure and hydraulic forming to ensure a full-stroke switching life of 10,000 cycles under high pressure.
Only globe valves, due to their flow resistance structure, are used more often than gate valves in throttling applications. Additionally, globe valves always have a very laborious opening and closing process whether installed normally or reversed, so they cannot be made very large or be difficult to operate. Furthermore, globe valves have a unidirectional sealing effect, so they are also used to prevent backflow of the working medium. Bellows Globe Valve Features:
1. Double seal design (bellows + packing). If the bellows fails, the valve stem packing will also prevent leakage and meet national sealing standards.
2. No fluid loss, reducing energy loss and improving plant equipment.
3. Long service life, reducing maintenance frequency and lowering operating costs.
4. Durable bellows seal design ensures zero leakage of the valve stem with no maintenance required.
5. The valve seat for gas media uses PTFE soft sealing material, enhancing the valve's sealing performance.
6. High temperature resistance ≤425°C. The valve seat uses a conical hard seal to achieve airtight performance and zero leakage.
Bellows Globe Valve The quality of the bellows globe valve is determined during production. To improve the quality during manufacturing, the bellows globe valve is a diaphragm valve, so it can isolate external dirty gases. This valve features frictionless operation, high sealing performance, and resistance to wear, and is equipped with related devices to create a completely sealed sterile production environment. It allows production machines to operate in a sterile environment, thereby producing high-quality products. Additionally, it has a compact and aesthetically pleasing appearance, and the valve stem surface is treated to have good corrosion resistance, effectively preventing corrosion of gas components.
Therefore, during use, the distance between the bellows and the valve must be maintained to prevent the bellows from bearing excessive pressure. Special attention should be paid to the material before melting, as it is a high-temperature resistant polymer. If used for throttling, the flow velocity of the liquid must be controlled, which will have some impact on the bellows globe valve.
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