Didtek ASTM A105N Weld Overlay UNS N06625+TCC Trunnion Ball Valve

Product Overview

This is a high-performance ear shaft fixed ball valve designed to cope with extremely harsh working conditions such as high pressure, corrosion and erosion. Its core value lies in providing top-notch corrosion and wear resistance protection for key sealing parts while ensuring the structural strength of the valve body through advanced surface engineering technology.

Didtek ASTM A105N Weld Overlay UNS N06625+TCC Trunnion Ball Valve

Detailed explanation of the core components

We can fully understand this product by breaking down its name:

Trunnion Ball Valve (Ear Shaft Fixed ball valve)

Working principle: The sphere is mechanically fixed by two "ear shafts" at the top and bottom and will not float or shift under high pressure. The torque when opening or closing the valve is borne by the ear shaft bearing.

Advantages: Suitable for high-pressure and large-diameter applications; The operating torque is small and it is easy to open and close. Reliable bidirectional sealing can be achieved; Long service life.

Valve body material: ASTM A105N

Meaning: ASTM A105 is the standard for "Carbon steel forgings for pipe fittings". The valve body is forged and features a dense and uniform metal structure.

"N" stands for normalizing treatment: This is a heat treatment process used to refine grains and eliminate internal stress, thereby enhancing the strength and toughness of materials.

Function: It provides the valve with a solid structural strength and pressure-bearing capacity, serving as the "skeleton" of the valve.

Core technology: Weld Overlay UNS N06625 (Surfacing UNS N06625 alloy)

Weld Overlay: A process in which a special alloy is fused onto the sealing surfaces of key components such as the valve body base material (A105N) and the ball.

UNS N06625 (Common trade grade: Inconel 625/ Alloy 625) :

Type: A nickel-based high-temperature corrosion-resistant alloy.

Outstanding performance

Excellent corrosion resistance: It has extremely strong resistance to pitting corrosion, crevice corrosion and stress corrosion cracking, and can withstand acidic environments (such as oil and gas containing H₂S and CO₂), seawater and various chemicals.

High strength and resistance to high/low temperatures: Maintains strength over a wide temperature range from low temperatures to approximately 980°C.

Good erosion resistance: It can resist the scouring of solid particles carried in the fluid.

Application area: Mainly surfacing on the surface of the ball and the sealing area of the valve seat to form a corrosion-resistant layer in direct contact with the medium.

Enhanced technology: + TCC

The most likely explanation for TCC is: Thermal Sprayed Tungsten Carbide Coating.

Characteristics: It features extremely high hardness and extraordinary wear resistance, especially against sliding wear and abrasive wear.

Combined application: In extremely harsh working conditions (such as slurry containing a large amount of hard particles), manufacturers will apply a TCC coating in specific high-wear areas (such as spheres or valve seats) on the basis of the surfacing 625 alloy. This combination of "corrosion-resistant alloy + super-hard coating" achieves the best blend of corrosion resistance and wear resistance.

The main features and advantages of the product

The structure of "rigidity and flexibility in combination" : A105N forged steel provides a solid pressure-bearing structure, the UNS N06625 surfacing layer offers an excellent corrosion barrier, and the TCC coating provides ultimate wear-resistant protection.

Extralong service life: The sealing surface, which is the most prone to failure of the valve, has been strengthened, significantly extending the service life under harsh working conditions and reducing maintenance and replacement costs.

High reliability: The ear-shaft design ensures stable sealing under high pressure and low-torque operation, and the bidirectional sealing performance provides higher safety redundancy.

Wide adaptability to working conditions: It can simultaneously handle the challenges of various complex working conditions such as high pressure, corrosion, erosion, and high temperature.

Economy: By using surfacing/spraying technology, expensive high-performance materials are only used where they are most needed, achieving the best balance between cost and performance.

Typical application fields 

Oil and Gas

Upstream exploitation: wellhead equipment, throttle valves, sand-bearing oil and gas Wells.

Long-distance pipelines: Main pipeline shut-off valves, pigging device transmitters/receivers.

Refining and chemical plant: Treatment of corrosive media.

Chemical Engineering and petrochemicals: Process pipelines for handling strong acids, strong alkalis and other highly corrosive chemicals.

Marine engineering: Seawater injection systems, submarine pipelines, and demanding processes on platforms.

Power industry: Slurry medium in flue gas desulfurization (FGD) systems.

Oil and gas storage and transportation and LNG: liquefied natural gas and other low-temperature or high-pressure occasions.

Design specification: