Corrosion-Resistant Globe Valves

Corrosion-resistant globe valve is a forced sealing valve designed for corrosive media. It realizes the on-off control of pipeline fluid through the vertical movement of the valve disc, and has the functions of diversion, cutoff, and regulation. Its core characteristics are the use of corrosion-resistant materials and special structural design, which is suitable for highly corrosive media environments such as strong acids, strong alkalis, and sulfur-containing liquids to ensure long-term stable operation.

Structure and working principle ‌ ‌

Valve body and seal design ‌ ‌

Forced sealing structure ‌: When closing, pressure must be applied to the valve disc to ensure that the sealing surface fits tightly to block the flow of the medium; ‌

Fluorine lining technology ‌: Some models are lined with polytetrafluoroethylene (PTFE) or fluoroplastics on the inner wall of the valve body, which significantly improves the corrosion resistance; ‌

Valve stem anti-seepage design ‌: Bellows or stuffing box seals are used to prevent medium leakage and valve stem corrosion. ‌Drive mode ‌ ‌Mainly manual operation, worm gear or electric actuator can be configured for high-pressure conditions.

 

Corrosion-Resistant Globe Valves

 

Applications

‌Petrochemical Industry‌
Transporting acid, alkali, salt solution and sulfur-containing crude oil to prevent valve leakage due to corrosion failure;
Controlling the inlet and outlet of the reactor, suitable for highly corrosive media such as nitric acid and acetic acid.
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Environmental Protection and Power‌
Controlling wastewater containing chloride ions and sulfides in the sewage treatment system;
Steam pipelines and seawater desalination equipment in thermal power plants, resistant to high temperature and high pressure corrosion.
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Special working conditions‌
Sulfur-containing natural gas or oil well pipelines adopt anti-sulfur design (such as NACE MR0175 standard materials) to prevent sulfide stress corrosion cracking.

Selection and Use Precautions‌
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Suitability Assessment‌
Select materials according to the characteristics of the medium (concentration, temperature, pressure), such as hydrofluoric acid requires fluorine-lined valves, and high-temperature steam prefers metal hard seals;
Particle-containing media require scraping valve discs to prevent wear of the sealing surface.
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Manufacturing process requirements‌
Imported brands (such as KNKE) usually use precision casting and surface polishing processes to reduce the risk of medium retention and corrosion;
Fluorine-lined valves must ensure the bonding strength between fluoroplastics and the valve body to avoid delamination and shedding.

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