China Suppliers Factory Flanged NPT/BSP Lockable 2500LB Reduced Bore DBB Double Ball Valve for Safe Isolation

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China Suppliers Factory Flanged NPT/BSP Lockable 2500LB Reduced Bore DBB Double Ball Valve for Safe Isolation

âˆš The innovative True DBB structure with dual ball valves and bleed cavity ensures reliable safety and complete isolation, making it an ideal choice for demanding applications in China.

âˆš Crafted from Class 2500 forged A105N material, our valves are designed to provide dependable performance even in high-pressure and high-risk environments, a key consideration for leading suppliers in the industry.

âˆš Featuring a flanged inlet and high-pressure threaded outlet, our products allow for versatile installations in compact pipeline systems, catering to diverse needs in various factory settings.

âˆš The reduced bore design is optimized for sampling points and instrumentation branches while maintaining exceptional isolation safety, appealing to both local and international markets.

âˆš With lockable dual stems that enable linked manual operation, our valves significantly reduce the potential for errors, enhancing safety control on-site for suppliers and factories alike.

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Product Description

Key Features

True Double Block & Bleed Isolation

Two independent ball valves with a central bleed cavity provide positive upstream and downstream isolation with safe pressure release and verification.

Fixed Trunnion-Mounted Ball Design

Trunnion-mounted structure reduces operating torque and ensures stable sealing performance under high pressure conditions.

Asymmetric Flanged × Threaded Configuration

Flanged inlet combined with high-pressure threaded outlet enables compact and flexible installation in complex pipeline layouts.

Optimized for Sampling & Instrument

Reduced bore design is ideal for sampling points, injection lines, and instrumentation branches without compromising isolation safety.

Dual Independent Lockable Stems

Independent stem bases with locking devices prevent accidental or unauthorized operation in hazardous environments.

Forged Steel for Severe Service

Forged body materials with Class 2500 pressure rating ensure long-term reliability in Oil & Gas, offshore, and high-pressure chemical services.

Frequently Asked Questions

What is the function of the central bleed cavity in a Double Block & Bleed valve?

The central bleed cavity sits between the two independent ball valves and allows operators to safely vent or verify that pressure has been fully released between the upstream and downstream isolation points. This ensures there is no trapped pressure before maintenance or inspection work begins.

Why is a trunnion-mounted ball design preferred over a floating ball design at high pressure?

In a trunnion-mounted design, the ball is mechanically anchored at the top and bottom, preventing it from shifting under high pipeline pressure. This significantly reduces the operating torque required to turn the valve and maintains consistent, reliable sealing even in high-pressure or high-temperature service conditions.

What are the advantages of an asymmetric flanged × threaded end configuration?

The combination of a flanged inlet with a high-pressure threaded outlet gives engineers flexibility when integrating the valve into complex piping systems. The flanged side provides a secure, gasket-sealed connection for the main line, while the threaded outlet allows for compact, space-saving connections to instruments or sample points.

Is this valve suitable for use in sampling and instrumentation applications?

Yes. The reduced bore design minimizes dead volume, making it especially well-suited for sampling points, chemical injection lines, and instrumentation branches. It maintains full double block and bleed isolation safety regardless of the smaller bore size.

How do the dual lockable stems improve operational safety?

Each of the two ball valves has an independent stem with a dedicated locking device. This prevents unauthorized or accidental actuation of either valve, which is critical in hazardous environments such as offshore platforms and refineries.

What pressure rating and material standards does this valve meet?

The valve is constructed from forged steel to achieve a Class 2500 pressure rating. This construction meets the demands of upstream Oil & Gas production and high-pressure chemical processing, providing long service life and resistance to fatigue and corrosion.

Product Detail

China Suppliers Factory Flanged NPT/BSP Lockable 2500LB Reduced Bore DBB Double Ball Valve for Safe Isolation