Product Specifications: DN25 (D32), DN32 (D40), DN40 (D50), DN50 (D63), DN65 (D7...
Product Specifications: D40*32, D50*32, D50*40, D63*32, D63*40, D63*50, D75*40, ...
Yes, a check valve can be installed vertically, but two critical conditions must be met: the fluid flow must be upward only, and a spring-assisted check valve must be used. Standard swing check valves without spring assistance are designed for horizontal installation only; forcing them into a vertical position will ca...
View MoreWhen space is limited, butterfly valves are easier to install than ball valves. Their wafer or lug-style body clamps directly between two pipe flanges, requiring minimal face-to-face length and no extra support structures. For large-diameter plastic piping systems in particular, the butterfly valve's slim, lightweight...
View MorePlastic valves are the right choice when your piping system handles corrosive fluids, requires lightweight components, or operates in environments where metal corrosion is a persistent problem. In conditions where pressure stays below 1.0 MPa and temperature below 95°C, plastic valves weigh only 30–40% of equivalent ...
View MoreWhat is Flange Softening?
1. Flange softening refers to the gradual decrease in hardness and strength of the flange material at the flange connection due to long-term pressure, temperature cycling, or media corrosion, causing the sealing surface to lose its original elasticity and tightening performance.
2. Softening can cause flange deformation and reduced bolt preload, leading to leakage or failure, especially in pipeline systems operating under high pressure, strong corrosion, or high temperature conditions.
3. In practical engineering, softening often manifests as loose flange bolts, deeper indentations on gaskets, or the appearance of micro-cracks; these are all signals requiring timely detection and maintenance.
How to reduce the risk of Flange Softening through material selection or process control?
1. Select softening-resistant materials
Using high-strength alloy steel or corrosion-resistant stainless steel flanges can significantly improve softening resistance.
For special media (such as acids, alkalis, and seawater), titanium alloy or nickel-based alloy flanges can be used to resist softening caused by chemical corrosion.
2. Optimize Heat Treatment Process
By using heat treatments such as normalizing, tempering, or quenching, the hardness and toughness of the material are improved, reducing the tendency to soften under high-temperature cycling.
Adding a residual stress relief process during flange production ensures that the flange achieves a uniform internal stress distribution before use.
3. Surface Protection and Anti-corrosion Coating
Spraying anti-corrosion paint, thermal spraying galvanizing, or ceramic coatings on the flange surface effectively prevents the media from corroding the metal substrate.
For pipeline systems requiring long-term operation, regular surface inspection and recoating are necessary to maintain the integrity of the protective layer.
4. Rational Design of Bolt Preload and Stiffness
Using high-strength bolts and calculating the preload according to standards ensures that the flange maintains sufficient clamping force under working pressure.
Adding reinforcing ribs or rigid supports to large-diameter or high-pressure flanges reduces the elastic deformation of the flange body.
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