Titanium double seal ball valve is suitable for various corrosive media and complicated working conditions because of its unique material properties and structural design. Specific application scenarios and media types are as follows:
I. Applicable Media
Oxidizing corrosive media
The compact oxide film formed on the surface of titanium materials (such as TiO2) has high chemical stability in oxidizing environments and can resist the corrosion of chlorine gas, sodium sodium hypochlorite, wet chlorine gas and aqua regia. Especially suitable for chlorine-containing media, such as seawater, salt fog, etc.
Organic and inorganic acids
Organic acids: Good for oxidizing organic acids (e.g. acetic acid, formic acid), but their suitability for reducing organic acids (e.g. concentrated sulfuric acid, hydrochloric acid) needs to be assessed based on concentration and temperature.
Inorganic acids: tolerates dilute sulfuric acid, nitric acid, etc., but avoids high concentrations of high-concentration red fuming nitric acid (>98%) or media containing free NO2.
Alkaline media and salt solutions
Titanium materials are almost impervious to corrosion in alkaline environments (e.g. sodium hydroxide, potassium hydroxide solutions) and are suitable for the transport of alkaline solutions; at the same time, titanium materials are highly resistant to corrosion in most salt solutions (e.g. sodium chloride, sodium bromide).
Media containing aerosols
When the plug valve is fully opened, the sealing cover is separated from the media. The plug structure has self-cleaning properties, can reduce particle deposition and is suitable for media (such as mud, ore pulp) that contain solid particles and are prone to scaling or crystallization.
II. Applicable Conditions
High temperatures and high pressure
Titanium has a high melting point (approximately 1668°C) and its strength increases with temperature, making it suitable for high-temperature applications (e.g. steam pipelines, high-temperature chemical processes).
The dual-seal structure can withstand the systempressure fluctuations of the system by means of soft andhard compound seal (such as PTFE + carbide).
Viscous and easily crystallizing media
The inner cavity of the valve body is designed without voids and the scraping effect of the metal lip can prevent the accumulation and crystallization of the medium. It is suitable for viscous medium (such as asphalt, resin) or crystalline medium (such as calcium sulfate, sodium carbonate solution).
Bidirectional flow pipeline
Dual-seal structure supports the bidirectional flow of media without distinction of direction of flow and is suitable for pipelines that require frequent change of direction of flow (e.g. chemical reactor inlet/ outlet, bidirectional fluid transportation systems).
Extreme corrosion conditions
Hydrogen brittleness risk control: The corrosion resistance of titanium materials in reductive media (e.g., wet hydrogen gas, hydrogen sulfide environment) is improved by surface treatment (e.g., anodic oxidation, ion modification), reducing the risk of hydrogen embrittlement.
Eclipse and crevice corrosion protection: titanium oxide film can quickly repair local damage and are suitable for working conditions where there is a risk of pitting or crevice corrosion (e.g. seawater desalination, chlorine alkali industry).
III. Design Advantages that support Working Condition Adaptability
Double Seal
Soft seals (e.g. PTFE) provide initial sealing force, while hard seals (e.g. metal backings) provide secondary protection to achieve zero leakage.
The sealing pressure between the sealing elements is dynamically adjusted as the stopper rotates to ensure the reliability of the seal in a fully open or fully closed position.
Material adaptability
Titanium materials (e.g. TA1, TA2, TA10) can be selected according to the composition of the medium and temperature. For example, the TA10 alloys containing palladium enhance corrosion resistance and are suitable for strong oxidizing media.
sleeve material (e.g., PTFE, RPTFE) can extend service life by adjusting lubricity and temperature resistance through packing.
Structural reliability
The top-mounted structure reduces the number of valve body connection bolts and improves reliability under high pressure conditions.
The plug is opened and closed by rotating 90 degrees and then moving vertically, avoiding direct friction on the seal and reducing the risk of wear and tear.
IV. INTRODUCTION Constraints
Reductive medium restrictions: avoid the use of strong reductive media such as concentrated sulfuric acid acid, hydrochloric acid, do not corrosion inhibitors, or surface treatment to enhance corrosion resistance.
Temperature Caps: Normal titanium materials are suitable for temperatures ≤ 330°. For high temperature applications, choose temperature resistance titanium alloys (such as Gr5).
Hydrofluoric acid risk: assessment of the impact of hydrogen diffusion on the toughness of materials in hydrogen-containing media.
