Bellows Sealed Valves: Key Features & Industrial Applications
1. Structural Design
Compactness: The structural design of bellows sealed valves is simple and compact, with the body and bonnet connected by double-headed studs. This design reduces manufacturing and maintenance complexity while enhancing the overall stability of the valve.
Fluid Passage Optimization: The fluid passages are carefully designed to minimize flow resistance, ensuring that the valve does not significantly impact flow during opening and closing.
2. Sealing Performance
Bellows Sealing: The bellows, as the main sealing component, are designed to form a reliable seal through elastic deformation when the valve is closed. This design significantly reduces the likelihood of leakage, ensuring system safety.
Dual Sealing System: In addition to the bellows, the valve features a dual sealing design using packing and bellows, achieving a zero-leakage effect and further enhancing sealing performance.
3. Wear and Corrosion Resistance Design
Surface Treatment: The stem nut undergoes nitriding treatment to increase surface hardness and wear resistance. This treatment effectively prevents galling during opening and closing, ensuring smooth operation.
Bellows Material: The bellows are typically made from highly corrosion-resistant metals, effectively resisting performance degradation in harsh environments. The design often incorporates 2 to 4 layers of overlapping bellows to prevent leakage from damage to a single layer.
4. Ease of Operation
Low Operating Torque: Bellows sealed valves are designed to require a small operating torque for opening and closing, making operation more flexible and enabling easy remote control and automation.
High Opening and Low Flow Resistance: The extended design of the bellows and high opening height reduce the primary flow resistance, resulting in a low flow resistance coefficient and improved flow efficiency.
Application Fields