Didtek Necking Double-Direction Lip Special Alloy Inconel 825 Trunnion Ball Valve

Product Overview

This is a ball valve that adopts a fixed ball structure, with the core flow-through component made of the special alloy Inconel 825, and integrates the advanced "necking type bidirectional lip seal" technology. It represents the advanced technology in the field of industrial valves, aiming to solve the problems of reliable shut-off and long-term operation of highly corrosive, easily crystallized, highly abrasive and hazardous media under harsh working conditions.

Didtek Necking Double-Direction Lip Special Alloy Inconel 825 Trunnion Ball Valve

Detailed explanation of Core features

Fixed Ball structure - Trunnion Ball Valve

Working principle: The sphere is rigidly supported by two shafts (the valve stem and the fixed shaft at the bottom). During the opening and closing process, the sphere only rotates and does not produce displacement or drift.

Core advantages

Low-torque operation: Even under high pressure, the torque required for valve opening and closing is relatively small, making the operation more convenient.

High-pressure application: Suitable for high-pressure and large-diameter working conditions of Class 600 and above.

Long service life: The sealing seat does not bear all the medium pressure, has less wear and a longer service life.

2. Special alloy Inconel 825 - Material core

This is the fundamental guarantee for the corrosion resistance of the valve. Inconel 825 is a nickel-chromium-iron-based austenitic alloy, renowned for its outstanding overall corrosion resistance:

Outstanding corrosion resistance: It has excellent resistance to sulfuric acid and phosphoric acid.

Excellent resistance to chloride stress corrosion cracking.

It is resistant to various inorganic and organic acids, and performs well especially in reducing and oxidizing media.

Key components: The addition of molybdenum and copper enhances its corrosion resistance in reducing environments, while titanium provides resistance to intergranular corrosion through stabilization heat treatment.

Application positioning: It is one of the preferred materials for treating strongly corrosive media such as acidic oil and gas, seawater, wet chlorine gas, sulfuric acid, and phosphoric acid.

3. Neck-constricting double-lip seal - Technical core

This is the essence of the valve's sealing technology, integrating multiple advanced design concepts:

Necking design: The channel in the valve seat area contracts in a "neck" shape.

Function: Reduce dead zones in the valve cavity, lower the possibility of medium sedimentation, crystallization or accumulation within the valve cavity, and is particularly suitable for slurries and media prone to crystallization.

Bidirectional sealing

When the valve is closed, it can simultaneously block the medium pressure from both the upstream of the pipeline and the downstream of the valve cavity.

Function: Achieve true bidirectional blocking, provide higher safety assurance, and facilitate downstream maintenance and pressure relief in the valve cavity.

Lip seal: The sealing edge of the sealing seat is designed in an elastic "lip" shape.

Low-pressure sealing: The initial seal is achieved by relying on the pre-tightening force of the spring to make the "lip" adhere to the ball.

High-pressure self-tightening seal: When the medium pressure rises, the pressure will act on the back of the sealing seat, pushing the "lip" more closely towards the ball, creating the effect of "the higher the pressure, the tighter the seal", ensuring zero leakage.

Self-cleaning and scraping effect: When the valve is opened or closed, the flexible lip can effectively scrape off the scale, crystals or solid particles adhering to the surface of the ball, and has excellent anti-clogging and self-cleaning capabilities.

Summary of main advantages

Absolute reliability: It can still ensure long-term stable operation under harsh working conditions such as strong corrosion, high pressure and large pressure difference.

Outstanding sealing performance: The bidirectional lip seal design can achieve zero leakage sealing of ANSI VI grade or higher.

Outstanding resistance to working conditions

Corrosion resistance: Thanks to Inconel 825 material.

Anti-clogging/crystallization: Thanks to the neck-tightening design and the scraping effect of the lip seal.

Anti-wear: The hard alloy sealing surface and robust structure are suitable for media containing particles.

Long life cycle and low maintenance cost: Although the initial investment is high, its extremely long service life and very low failure rate can significantly reduce the total cost throughout the entire life cycle.

Typical application fields

This valve is specially designed to solve the problem of "difficult" media and is commonly used in the following harsh working conditions

Oil and gas: Facilities for the exploitation and processing of oil and gas fields with high sulfur and chlorine content, and long-distance pipelines.

Chemical engineering and petrochemicals: Production facilities for highly corrosive chemicals such as sulfuric acid, phosphoric acid, strong alkali, and chloride solvents.

Marine engineering: Seawater cooling systems, submarine pipelines, ship ballast systems.

Environmental protection and power: Addition of highly corrosive agents in flue gas desulfurization systems and wastewater treatment.

Metallurgy and mining: Acid leaching, extraction and other processes in hydrometallurgical processes.

Conclusion

The neck-tightening type bidirectional lip seal Inconel 825 fixed ball valve is not merely a valve; it is an "engineering solution" specifically designed for extreme industrial environments. It provides the highest level of safety and operational reliability for the most critical and demanding application points in the process industry by combining top-grade corrosion-resistant materials with innovative sealing structures.

Design specification: