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Fire-Safe Multi-Layer Stem Sealing Trunnion Mounted Ball Valve Class 2500 - Reliable China Suppliers & Factory
Key Features
Three-Piece Split Body + Heavy Flange Connection
Thick flanges and multi-bolt design ensure high strength, easy assembly, and convenient maintenance in severe service.
Anti-Blowout Stem & Multi-Layer Packing
Multi-stage stem with anti-blowout design, multi-layer packing, and thrust bearings ensure safe, leak-free performance under high pressure.
Fire-Safe & Anti-Static Design
Visible fire-safe coating and anti-static construction maintain sealing and safety in hazardous environments.
Trunnion Mounted Design
Upper and lower bearings support the ball, preventing displacement and ensuring stable operation at Class 2500.
Metal-Seated Hard Seal
Metal-to-metal sealing delivers reliable shut-off in high temperature, high pressure, abrasive, and frequent cycling service.
Gearbox Operation (Optional Electric/Pneumatic)
Industrial gearbox provides smooth torque control for large sizes, with optional electric or pneumatic actuation.
Frequently Asked Questions
What is the purpose of the three-piece split body design in this ball valve?
The three-piece split body design with heavy flange connection allows for easy disassembly and maintenance without removing the valve from the pipeline. The thick flanges and multi-bolt configuration provide superior structural integrity, making it ideal for severe service conditions involving high pressure and extreme temperatures.
How does the anti-blowout stem design improve valve safety?
The anti-blowout stem design prevents the stem from being ejected under high-pressure conditions, which is a critical safety feature. Combined with multi-layer packing and thrust bearings, it ensures a completely leak-free seal even under extreme operating pressures, significantly reducing the risk of accidents in industrial environments.
What environments is the fire-safe and anti-static design suitable for?
The fire-safe and anti-static design is specifically engineered for hazardous environments such as oil and gas facilities, chemical plants, and refineries where flammable or explosive materials are present. The fire-safe coating maintains sealing integrity even during a fire event, while the anti-static construction prevents the buildup of static electricity that could ignite volatile substances.
What is the advantage of a trunnion mounted design over a floating ball design?
In a trunnion mounted design, the ball is mechanically anchored by upper and lower bearings, so it does not shift under line pressure. This makes it far more suitable for large-diameter, high-pressure applications such as Class 2500 service, as it significantly reduces operating torque, prevents seat wear, and ensures consistent, stable sealing performance over time.
When should a metal-seated hard seal be chosen over a soft seat?
A metal-seated hard seal should be selected when the application involves high temperatures that would degrade elastomeric soft seats, highly abrasive media that would erode soft seat materials, frequent cycling operations, or extremely high pressure conditions. Metal-to-metal sealing provides exceptional durability and long service life in these demanding scenarios where soft seats would fail prematurely.
What actuation options are available and how do I choose the right one?
This valve supports manual gearbox operation as the standard option, with optional electric actuators and pneumatic actuators available. Manual gearbox operation is ideal for infrequent operations and locations without power supply. Electric actuators are recommended for remote or automated control systems. Pneumatic actuators are preferred where fast switching speeds are required or in environments where electrical equipment poses a hazard. The choice depends on your operational frequency, automation requirements, and site conditions.