Heavy Duty Industrial Semi Ball Valve for High Pressure and Temperature Use

I. Product: Semi ball valve

Large Diameter Worm Gear Eccentric Semi Ball Valve DN1200 PN40 Cast Steel WCB Hard Sealed
Side Entry Eccentric Semi Ball Valve Large Diameter High Pressure Wear Resistant Slurry Valve
Large Diameter Eccentric Semi Ball Valve DN1200 Anti-Clogging Hard Sealed for Power Plant/Sewage

II. Product Details

🔹 Product Overview
This series of large diameter eccentric semi ball valves is specifically designed for severe conditions characterized by high wear, scaling, and solid particles. Featuring a side entry eccentric structure, metal hard sealing pair, and a worm gear drive mechanism, it boasts excellent wear resistance, anti-clogging properties, zero leakage, and bi-directional pressure bearing capabilities. It is widely used in large-diameter pipeline systems across power plant ash handling, sewage treatment, metallurgy, mining, and petrochemical industries, effectively solving common pain points of traditional gate and butterfly valves such as clogging, rapid wear, and seal failure.
🔹 Core Structure & Working Principle
1. Eccentric Semi-Ball Design
The eccentric structure between the semi-ball and valve stem ensures the sealing surfaces disengage immediately upon opening/closing. This eliminates friction and prevents media particles from jamming the sealing surface, significantly extending service life.
The side entry valve body structure features an integrally formed semi-ball and stem, offering high strength and rigidity to withstand high-pressure impacts and media scouring.
2. Metal Hard Sealing Pair
The sealing surface adopts hard alloy overlay welding or spraying technology. With a high surface hardness (HRC≥45), it is wear-resistant, scour-resistant, and corrosion-resistant, ensuring long-term sealing reliability and achieving bi-directional zero leakage.
3. Worm Gear Drive Mechanism
Equipped with a high-torque worm gear mechanism, it ensures easy and labor-saving operation with a built-in self-locking function to prevent accidental opening caused by media pressure. It can be adapted with electric, pneumatic, or hydraulic actuators for remote automation.
4. Large Diameter Adaptation
Designed for ultra-large diameters like DN1200, the valve body is integrally cast with an optimized flow channel. This ensures strong flow capacity, low flow resistance, and supports bi-directional flow to meet high-volume media transport demands.
🔹 Key Technical Parameters 

🔹 Material Description

a, Body Material (WCB): The valve body is clearly marked "WCB", indicating cast carbon steel. It offers excellent strength, toughness, and weldability, making it a mainstream material for high-pressure and wear-resistant conditions. It can withstand 4.0MPa high pressure and high-temperature media, offering high cost-performance and strong adaptability.

b, Semi-Ball Material: Same material as the body or stainless steel, with hard alloy overlay on the surface. It is wear-resistant and scour-resistant, ensuring no deformation or corrosion over long-term use.

c, Sealing Surface Material: Adopts Stellite alloy overlay welding technology. The high surface hardness resists wear and scouring, enduring the impact of particle-laden media while maintaining stable sealing performance.

d, Stem Material: High-quality stainless steel with corrosion resistance and high torsional strength, ensuring no deformation or jamming during long-term operation.

🔹 Typical Application Scenarios
a, Power Plant Ash Handling Systems: Ideal for ash and slag transport pipelines in thermal power plants. Suitable for media containing solid particles, offering wear resistance and anti-clogging features to solve leakage and wear issues of traditional valves.

b, Sewage Treatment Industry: Suitable for municipal and industrial wastewater pipelines handling sludge and impurities. Offers anti-clogging and corrosion resistance for media shut-off and regulation in harsh conditions.

c, Metallurgy & Mining Industry: Used in tailings and metallurgical slurry pipelines. Excellent wear and scour resistance allow it to withstand high-concentration particle media, with a service life far exceeding ordinary valves.

d, Petrochemical Industry: Suitable for impurity-laden media pipelines in refineries and chemical plants, offering high pressure and corrosion resistance for strict process conditions.

e, Water Conservancy & Supply/Drainage: Ideal for large-diameter water supply and drainage pipelines, featuring low flow resistance and strong flow capacity for high-volume media control.

🔹 Core Product Advantages

a, Excellent Anti-Clogging & Wear Resistance: The eccentric structure eliminates friction during operation. Combined with the hard alloy sealing surface, it effectively prevents particle jamming and resists wear, making it perfect for media containing solids.

b, Bi-Directional Zero Leakage: The metal hard sealing pair achieves bi-directional zero leakage. The bubble-tight sealing performance meets strict requirements with no risk of media backflow or leakage.

c, High Strength for Large Diameters: Designed for ultra-large diameters with an integral cast steel body. It offers high strength and rigidity to withstand high-pressure impacts and thermal expansion stress without deformation or leakage.

d, Easy Installation & Maintenance: Flange connection allows for easy installation, while the side entry structure facilitates online maintenance. With no internal vulnerable parts, it has a low failure rate and long service life, reducing maintenance costs.

e, Customization Services: Valve body material, sealing type, and drive method can be customized based on media, temperature, and pressure. Supports customization for special conditions (low temp, anti-corrosion, fire-safe). All valves undergo strength and sealing tests before leaving the factory, complying with national and industry standards.

🔹 Installation & Operation Instructions

a, Before installation, verify that the valve model, pressure rating, and diameter match the pipeline conditions. Check if the sealing surface and valve stem are intact.

b, Keep the valve in a semi-open state during installation to avoid damaging the sealing surface. After installation, ensure flange bolts are evenly tightened with no looseness or leakage.

c, After installing the drive mechanism, test the flexibility of opening/closing and ensure the position signals are accurate. For valves with self-locking devices, verify the self-locking function.

d, Before recommissioning after long-term storage, manually operate the valve several times to check for any jamming on the sealing surface. Put into use only after confirming no abnormalities.