Didtek Alloy 625 Welded Overlay LF2 Trunnion Ball Valves

Product Overview

It is a high-performance and highly reliable valve specially designed to cope with extremely harsh working conditions. It achieves a perfect combination of the structural strength of the valve body and the super corrosion and wear resistance of the sealing surface by surfacing high-performance nickel-based alloys on a high-strength carbon steel substrate.

Didtek Alloy 625 Welded Overlay LF2 Trunnion Ball Valves

Product name analysis and core concepts

Trunnion Ball Valves - Fixed ball valves

Core structure: The ball of this type of ball valve is fixed by two "pivots" at the top and bottom. When the valve is opened or closed, the ball only rotates and does not produce displacement.

Core advantages: Suitable for high-pressure and large-diameter working conditions. Under high pressure, the ball will not be pressed against the valve seat, so the operating torque is small, the sealing performance is stable and the service life is long. This is the most fundamental difference from the "floating ball valve".

LF2 - Valve body material

Definition: LF2 is a carbon steel forging material in accordance with the American ASTM standard.

Features: It has excellent strength and toughness, and its comprehensive mechanical properties are superior to those of cast steel (such as WCB). It is usually used in high-pressure pipeline systems with higher safety requirements.

Role: As the base material of the valve, it provides structural strength and pressure-bearing capacity.

Alloy 625 Welded Overlay - alloy 625 surfacing

Alloy 625: It is a high-performance alloy based on nickel-chromium and with the addition of molybdenum and niobium.

Welded Overlay: refers to a welding process, namely surfacing or cladding.

Combination meaning: On the surface of the LF2 carbon steel made sphere and the sealing surface of the valve seat, a layer of Alloy 625 alloy is cladding through a special welding process (such as PTA plasma arc welding, laser welding, etc.).

Core features and advantages

Outstanding corrosion resistance

The Alloy 625 surfacing layer can resist a wide range of corrosive media, including:

Chloride stress corrosion cracking

Pitting corrosion and crevice corrosion

Oxidizing and reducing acids

Seawater, salt solutions

Various media in hydrometallurgy

Excellent wear resistance and erosion resistance

The surfacing layer has high hardness and good wear resistance, making it particularly suitable for slurry containing solid particles or high-speed fluid conditions. It can effectively prevent the sealing surface from being eroded and damaged.

High strength and high pressure-bearing capacity

The LF2 forged steel valve body ensures that the valve has extremely high structural integrity and safety in high-pressure environments.

The fixed structure makes the valve easy to operate under high pressure, with reliable sealing and no risk of jamming.

A cost-effective solution

Compared with the valves made entirely of Alloy 625 material, this composite manufacturing process of "base carbon steel + surface surfacing welding" significantly reduces the manufacturing cost while ensuring the performance of the key parts (sealing surface).

Long service life and high reliability

Under harsh working conditions, the surfacing layer has a thicker thickness and stronger adhesion compared to surface treatment methods such as spraying and coating, and is less likely to peel off, ensuring the long service life and maintenance-free cycle of the valve.

Typical application fields

This valve is one of the top choices for the following industries:

Oil and gas: Key parts of offshore platforms, high-sulfur oil and gas fields, and oil and gas pipelines.

Chemical Engineering and petrochemicals: Process pipelines for highly corrosive chemicals (such as acids, alkalis, and solvents).

Energy and Power: Flue gas desulfurization systems, high-pressure steam systems.

Marine engineering: Seawater cooling systems, ballast systems.

Mining and Metallurgy: Slurry conveying pipelines, treatment of corrosive media in metallurgical processes.

Summary

Alloy 625 Welded Overlay LF2 Trunnion Ball Valves represent an advanced direction of industrial valve technology. It perfectly resolves the engineering challenge of how to simultaneously ensure the strength, sealing performance and service life of valves in harsh environments where high pressure, corrosion and wear coexist. It is not a general-purpose valve but a key device tailor-made for specific harsh conditions, and it is an important part of ensuring the safe, stable and long-term operation of modern industrial facilities.

Design specification: