[email protected]
Home > Forged Steel Ball Valve > China ASTM A105N 1500LB Flanged DBB Ball Valve - Reliable China Suppliers & Factory for Oil & Gas Industry Manufacturer, Manufacturers
China ASTM A105N 1500LB Flanged DBB Ball Valve - Reliable China Suppliers & Factory for Oil & Gas Industry Manufacturer, Manufacturers
1 / 1
China ASTM A105N 1500LB Flanged DBB Ball Valve - Reliable China Suppliers & Factory for Oil & Gas Industry Manufacturer, Manufacturers

China ASTM A105N 1500LB Flanged DBB Ball Valve - Reliable China Suppliers & Factory for Oil & Gas Industry Manufacturer, Manufacturers

,

√ The True Double Block & Bleed valve, featuring two trunnion-mounted balls, ensures a fully isolated cavity, maximizing safety for pipeline systems in China.

,

√ With independent sealing for both upstream and downstream, our valves provide reliable isolation, even if one seat fails, making them a preferred choice among suppliers.

,

√ A dedicated bleed port enables immediate pressure release and visual leak verification, essential for safe maintenance operations.

,

√ Constructed from forged ASTM A105N, our valve bodies offer exceptional strength and stability under the demanding conditions of Class 1500 high-pressure systems.

,

√ This compact, heavy-duty design is specifically engineered to meet the needs of critical Oil & Gas applications and high-risk pipelines, perfect for factories in need of reliable equipment.

,
Send Inquiry

Product Description

Key Features

True Double Block & Bleed (DBB) Design

Two independent seals with a bleed port ensure complete line isolation and safe pressure relief.

Independent Operation for Flexible Isolation

Each ball can be operated independently for selective upstream or downstream isolation during maintenance.

Bleed Port for Pressure Verification

Allows instant cavity pressure release and visual leak verification before servicing.

Forged High-Strength Body for High-Pressure Service

Forged steel body delivers reliable performance under Class 1500 high-pressure conditions.

Frequently Asked Questions

What is a Double Block and Bleed (DBB) valve?
A Double Block and Bleed (DBB) valve is a single valve body that provides two independent seating surfaces and a bleed port between them. This design allows complete isolation of a pipeline section and the safe release of trapped pressure, eliminating the need for multiple separate valves.
Why is independent ball operation important in a DBB valve?
Independent ball operation allows technicians to open or close each ball individually, enabling selective upstream or downstream isolation without affecting the rest of the system. This flexibility is critical during maintenance, inspection, or repair activities to minimize process disruption.
What is the purpose of the bleed port on a DBB valve?
The bleed port sits between the two seals and serves two key functions: it allows operators to depressurize the trapped cavity between the seats before maintenance, and it provides a visual indicator for leak detection — confirming that both seals are holding properly before any work begins.
What pressure class is the forged body rated for?
The valve features a forged high-strength steel body rated for Class 1500 service. This ensures it can withstand extreme pressure conditions common in upstream oil and gas, petrochemical, and high-pressure industrial pipeline applications.
What are the typical applications for a DBB ball valve?
DBB ball valves are widely used in oil and gas pipelines, refinery process lines, chemical plants, and offshore platforms where safe in-line maintenance, pressure testing, and complete pipeline isolation are required. They replace multiple single valves, reducing installation space and potential leak points.
How does a forged body improve DBB valve performance over cast alternatives?
Forged steel bodies offer superior grain structure, higher tensile strength, and greater resistance to pressure-induced fatigue compared to cast bodies. This results in improved reliability, longer service life, and enhanced safety margins — especially under cyclic high-pressure operating conditions.

Related Products

China Class 300 Trunnion-mounted Forged Steel Ball Valve Supplier, Factories

China Class 300 Trunnion-mounted Forged Steel Ball Valve Supplier, Factories
High-Quality Class 2500 / 6000 PSI Forged DBB Trunnion-Mounted Ball Valve Manufacturer, Factory

High-Quality Class 2500 / 6000 PSI Forged DBB Trunnion-Mounted Ball Valve Manufacturer, Factory
China 300LB Forged DBB Trunnion-Mounted Ball Valve for Gas Pipeline Manufacturers, Factories

China 300LB Forged DBB Trunnion-Mounted Ball Valve for Gas Pipeline Manufacturers, Factories
China 900LB Forged DBB Trunnion-Mounted Cryogenic Ball Valve Manufacturer, Suppliers

China 900LB Forged DBB Trunnion-Mounted Cryogenic Ball Valve Manufacturer, Suppliers
China Class300 Forged DBB Trunnion-Mounted Ultra-Low Temperature Ball Valve Suppliers, Factories

China Class300 Forged DBB Trunnion-Mounted Ultra-Low Temperature Ball Valve Suppliers, Factories
China Class 900 Reduced Port Forged DBB Trunnion-Mounted Cryogenic Ball Valve Manufacturers, Factories

China Class 900 Reduced Port Forged DBB Trunnion-Mounted Cryogenic Ball Valve Manufacturers, Factories
China Stainless Steel Twin Ball DBB Valve with Dual Manual Handles Manufacturer, Factory

China Stainless Steel Twin Ball DBB Valve with Dual Manual Handles Manufacturer, Factory
High-Quality Twin Ball DBB Trunnion ‑Mounted Ball Valve with Worm Gear Supplier, Factories

High-Quality Twin Ball DBB Trunnion ‑Mounted Ball Valve with Worm Gear Supplier, Factories
OEM Reducing Flanged Twin Ball Double Block and Bleed Valve Suppliers, Factories

OEM Reducing Flanged Twin Ball Double Block and Bleed Valve Suppliers, Factories
High-Quality Integrated Twin Ball DBB Valve with Dual Stems Manufacturers, Suppliers

High-Quality Integrated Twin Ball DBB Valve with Dual Stems Manufacturers, Suppliers