As the core link of environmental protection management of coal-fired power plants, the desulfurization system of power station boilers is exposed to highly corrosive media environments for a long time, such as sulfur dioxide (SO₂), hydrogen sulfide (H₂S), chloride ions (Cl⁻) and acidic slurries. These media place extremely high demands on the corrosion resistance of key components such as valves. The manual rubber-lined stop valve J41J-64 has become an important control device under such working conditions due to its unique structural design and material selection.

I. Core design features of the J41J-64 rubber-lined stop valve

Corrosion resistance of rubber-lined materials:

The inner surface of the valve body of the stop valve J41J-64 is covered with a rubber lining layer. These materials have excellent tolerance to corrosive media such as acids, alkalis, and salts, and are especially suitable for sulfuric acid, hydrochloric acid and wet flue gas environments commonly found in desulfurization systems, and can meet the temperature fluctuation requirements of different process sections of the desulfurization system. In addition, the high elasticity of the rubber material can compensate for the slight deformation during the opening and closing of the valve, ensuring long-term sealing performance.

Impact resistance and stability of structural design:

The integrated design of valve disc and valve stem of stop valve J41J-64: By fixing the valve disc and valve stem as an integral structure, the risk of internal parts falling off due to pipeline pressure fluctuations is effectively prevented, while reducing leakage points.

Short stroke design: The valve stem stroke is usually 1/4 of the nominal diameter, opening and closing quickly and with small torque, which reduces the wear of the sealing surface due to frequent operation.

Forced sealing mechanism: When closed, the sealing surface is forced to fit by mechanical pressure to avoid medium penetration, which is especially suitable for high pressure difference conditions.

II. Challenges of corrosive media in desulfurization system to valves

The corrosion environment of the desulfurization system of power station boilers is complex, mainly including the following damage mechanisms:

Chemical corrosion: Acidic media directly react with metal matrix, resulting in oxidation or dissolution of materials.

Electrochemical corrosion: The electrolyte in the slurry forms micro-batteries on the valve surface, accelerating local corrosion of the metal.

Abrasion corrosion: High-speed flowing solid-containing media (such as gypsum slurry) causes erosion and wear on the inner wall and sealing surface of the valve body.

Crystallization corrosion: Soluble salts in the medium crystallize and expand on the valve surface, causing the lining layer to crack or peel off.

Globe valve J41J-64 addresses the above problems through the following designs:

Physical isolation of the rubber lining: The rubber lining completely isolates the metal substrate from the corrosive medium to avoid the direct effects of chemical and electrochemical corrosion.

Wear resistance optimization: High-hardness rubber can withstand the impact of solid particles in the slurry and extend the service life of the valve.

Structural anti-fatigue design: The integrated valve disc and short-stroke operation reduce mechanical stress concentration and reduce the risk of material fatigue caused by frequent opening and closing.

III. Durability performance under actual working conditions

Long-term operation stability

In key locations such as the outlet of the desulfurization system slurry circulation pump and the inlet of the absorption tower, the rubber lining of J41J-64 can operate stably for more than 5 years without replacement. Its durability is mainly due to:

Material selection matches the working conditions: For example, EPDM performs well in slurries with a pH of 2-12, while FKM is suitable for media containing strong oxidants.

Maintenance convenience: The stop valve J41J-64 is designed to support quick replacement of linings or seals, reducing downtime.

Adaptability to extreme working conditions

Temperature fluctuations: The flue gas temperature of the desulfurization system is usually 60-80℃, and the rubber lining material can still maintain elasticity and sealing performance within this range.

Pressure shock: The design of the nominal pressure PN6.4 can withstand pressure fluctuations caused by system start-up and shutdown or load changes, and the valve body structure has no deformation or leakage.

Failure mode and improvement direction

Although J41J-64 has high reliability, it is still necessary to pay attention to the following scenarios:

High-speed medium flushing: If the stop valve J41J-64 is mistakenly used for flow regulation, the high-speed fluid at the throttle will accelerate the wear of the rubber lining.

Improper installation: Reverse installation or misalignment of the pipeline may cause local stress concentration and shorten the service life.

IV. Maintenance and optimization suggestions

Regular inspection and maintenance

Check the thickness and surface integrity of the rubber lining every 6 months, and use an electric spark detector to check for micropores or cracks.

Clean the scale or sediment in the valve cavity to prevent solid particles from aggravating the wear of the sealing surface.

Operation specification

It is strictly forbidden to use beyond the scope (such as flow regulation or over-temperature and over-pressure conditions).

The stop valve J41J-64 needs to be operated slowly when opening and closing to avoid damage to the lining layer caused by instantaneous pressure shock.

The manual rubber-lined stop valve J41J-64 has shown excellent durability in the harsh environment of the power plant boiler desulfurization system through dual optimization of materials and structures. Its core advantage lies in the chemical stability of the rubber lining and the reliability of the structural design, which can effectively resist the combined effects of corrosion, wear and pressure shock.

When looking for high-quality, reliable boiler valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229
Yoyik offers various types of spare parts for steam turbines, generators, boilers in power plants:
pilot solenoid valve 300AA00126A
Electric butterfly valve D971X-10C
gate Z961Y-300LB SA-106C
Seal kit Z960Y-20
Manual shut-off valve WJ61F-16P
VALVE Q641F-40C DN25
Stop valve J11W-16P
Check valve H61Y-420V
SOLENOID VALVE SPARE PART KIT K302-713
Isolation valve F3DG5S2-062A-220DC50-DFZK-V/B08
Reheat hot section plugging valve SD61H-P5450V ZG15Cr1Mo1V
Mechanical Stop Electromagnet DF2025
4 2 dc valve D1VW004CNJW91
Stop valve J61Y-P51150V
electro hydraulic servo valve working MOOG72-1202-10
Gear pump hyd tension SSC PGP505A0040CQ202NESE3B1B1
solenoid valve C23BB4002011B40
Hydraulic accumulator bladder & Seal kit NXQ-A16/31.F-L-Y
Repair Kit NXQ-A-6.3L/31.5-L-Y
Reheat cold section plug valve SD61H-P3550 20G
budget water cooling pump DFB100-65-260
change-over ball valve M-3SEW6U36/420MG24N9K4
shut off valve types WJ50F1.6P
Throttle valve L61Y-2000Lb
gate Z41Y-16
4-way valve 1F05404
gate Z561Y-40
Butterfly valve D343X-25
Gasket Y10-6
3 WAY VALVE LXF150/1.6C/P
Electric stop valve S961Y-2100SPL
Stop valve J961Y-250V