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Forged Reduced Bore Trunnion Mounted Ball Valve with Lockable Lever Handle

High-Integrity Double Ball DBB Trunnion Mounted Valve

Forged Double Ball DBB Valve with Dual Gear Operation

Large Diameter Fully Welded Ball Valve for Natural Gas Transmission Pipeline

Fully Welded Flanged Trunnion Mounted Ball Valve

High-Temperature Hard-Seal Fixed Ball Valve with DBB Structure

Durable High-Temperature Floating Ball Valve for Severe Environments (Up to 500°C)

Cryogenic Reduce Port Floating Ball Valve with Locking Device

Cryogenic Top Entry Floating Ball Valve with Extended Stem

Hydraulic Scotch Yoke Actuated Flanged Type Trunnion Mounted Ball Valve

Severe Service Metal Seated High-Integrity DBB Ball Valve for Critical Isolation.jpg

High-Integrity DBB Ball Valve Factory in China | Severe Service Metal-Seated Suppliers for Critical Isolation

√ Severe Service DBB Ball Valves by a Leading Metal-Seated Specialist in China
Designed and manufactured by one of the most reliable suppliers in the industry, our ball valves incorporate advanced hard sealing DBB technology.

√ True DBB Structure with Optimized Sealing Loads
This design guarantees dependable double isolation and safe cavity pressure relief, making it ideal for ultra-high pressure environments.

√ Heavy-Duty Gear-Operated Design for Superior Performance
Engineered for large-bore, high-pressure applications, ensuring smooth and stable operation even in the most demanding conditions.

√ Fire-Safe & Anti-Static Features Integrated
Built-in safety mechanisms cater to hazardous and critical services, enhancing reliability in various applications.

√ Engineered for Critical Pipelines
Our products have a proven track record in Oil & Gas, Petrochemical, and other severe process environments, manufactured in our state-of-the-art factory.

Product Details

Key Features

Heavy-Duty Forged Body with Thick Flanged, Multi-Bolt Design

Forged valve body combined with thick flanges and multi-bolt connections, providing superior pressure containment, load distribution, and structural rigidity for severe service.

Trunnion-Mounted Ball Design for Severe Service

Fixed ball supported by upper and lower trunnions to minimize ball deflection, ensuring stable operation and reliable sealing under ultra-high pressure DBB service.

True DBB Configuration with Controlled Sealing Loads

Dual sealing seats provide complete upstream and downstream isolation, with controlled cavity pressure relief to enhance pipeline safety.

Proven Metal-Seated Sealing System

Metal-to-metal sealing technology engineered for high temperature, high pressure, and abrasive or corrosive media, delivering long-term sealing integrity.

Heavy-Duty Gear-Operated Mechanism for Large Sizes

Worm gear operation ensures controlled torque output and smooth, stable operation for large-bore, high-pressure applications.

Fire-Safe, Anti-Static & Anti-Blowout Safety Design

Integrated safety features designed in accordance with fire-safe and anti-static requirements, ensuring operational integrity in hazardous service conditions.

Frequently Asked Questions

In a trunnion-mounted ball valve, the ball is mechanically anchored by upper and lower trunnions, which absorbs pipeline pressure loads and prevents ball deflection. This makes it significantly more suitable for high-pressure and large-bore applications compared to floating ball valves, where the ball relies on line pressure to achieve sealing — a method that becomes impractical at elevated pressures.

DBB refers to a valve configuration that provides two independent sealing surfaces (upstream and downstream) and a bleed/vent connection to relieve the trapped cavity pressure between them. This design allows operators to safely isolate sections of a pipeline and verify complete sealing integrity, making it essential for maintenance operations and hazardous fluid control in oil, gas, and chemical industries.

Metal-seated sealing systems are preferred in environments involving high temperatures, high pressures, or media that are abrasive, corrosive, or contain particulates. Soft-seated (elastomeric) designs can degrade or fail under these conditions, while metal-to-metal sealing provides long-term durability and maintains integrity across a wider range of demanding operating conditions.

A forged valve body offers superior strength, tighter grain structure, and enhanced resistance to pressure and mechanical stress compared to cast bodies. When combined with thick flanges and multi-bolt connections, it ensures optimal pressure containment and load distribution, making the valve reliable and safe even under the most severe service conditions such as ultra-high pressure or cyclical loading.

Fire-safe design ensures the valve maintains a pressure-tight seal even if non-metallic sealing components are damaged or destroyed by fire, preventing uncontrolled fluid release. The anti-static feature provides a continuous electrical path through the valve to prevent the buildup of static charge during operation, reducing ignition risk in flammable or explosive media environments — both being critical safety requirements in oil, gas, and petrochemical industries.

Gear operation is recommended for large-bore valves (typically DN 150 / 6" and above) and high-pressure applications where the operating torque exceeds what can be safely handled manually with a lever. A worm gear actuator multiplies the applied force, enabling smooth and controlled valve operation while reducing operator effort and the risk of sudden or uncontrolled valve movement.