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China Suppliers Factory Forged Double Block and Bleed (DBB) Valve with Dual Gear Operation for Oil & Gas Applications
Key Features
True Double Block and Bleed Isolation
Two independent balls provide positive dual isolation, replacing traditional two-valve assemblies in one compact body.
Integrated Cavity Vent for Online Seal Verification
Allows pressure monitoring and safe cavity discharge to confirm seal integrity during operation.
Heavy-Duty Forged Trunnion Construction
Designed for high pressure service with fire-safe, anti-static, and blowout-proof safety protection.
Automation-Ready and Project Customizable
ISO 5211 interface with flexible materials, pressure ratings, and sizes for critical oil & gas applications.
? Frequently Asked Questions
QWhat is a Double Block and Bleed (DBB) ball valve?
AA Double Block and Bleed (DBB) ball valve features two independent seating balls that provide positive bidirectional isolation, with an intermediate cavity that can be monitored or vented — all within a single compact valve body, replacing the need for two separate valves.
QHow does the integrated cavity vent confirm seal integrity online?
AThe cavity vent port connects to the space between the two balls. Operators can monitor pressure at this port to verify that each seat seal is holding without interrupting flow. The vent also allows safe discharge of trapped pressure for in-line inspection and maintenance.
QWhat safety standards does the heavy-duty forged trunnion construction comply with?
AThe forged trunnion ball valve is designed to meet fire-safe requirements (API 607 / ISO 10497), anti-static testing, and blowout-proof stem standards — ensuring reliable, certified performance in high-pressure oil, gas, and petrochemical environments.
QWhat does ISO 5211 compliance mean for actuator automation?
AISO 5211 defines a standardized mounting interface between the valve stem and actuators. This allows the valve to be directly fitted with electric, pneumatic, or hydraulic actuators from any compatible manufacturer — simplifying automation integration and eliminating the need for custom adapter kits.
QCan a DBB ball valve fully replace a traditional two-valve assembly?
AYes. By integrating two isolation functions into one body, a DBB valve significantly reduces installation length, total weight, and the number of potential leak points, while also lowering procurement, installation, and long-term maintenance costs.
QWhat customization options are available for specific project requirements?
AThe valve can be configured with various body materials (carbon steel, stainless steel, alloy steel), seat materials (PTFE or metal-to-metal), pressure classes (ASME 150–2500), end connection types, and surface coatings — with full project documentation packages available to meet individual pipeline specifications.