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Pipeline Double Block & Bleed

Trunnion Mounted DBB Valves

Trunnion mounted DBB valves are used where a project needs DBB functionality together with supported-ball construction typical of demanding pipeline isolation duties. Selection starts with size and class, then moves quickly to bore, seat philosophy, cavity pressure relief, operator torque and project testing requirements.

Trunnion-Supported BallPipeline IsolationFull / Reduced BoreSeat & Cavity Engineering

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Trunnion Mounted DBB Valves engineering collection

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Buyer Selection Matrix

Trunnion DBB Engineering Checks

Pressure class and line size	Confirm the project class, design pressure/temperature and line size before selecting body and operator configuration.
Seat philosophy	State project requirements for seat directionality, SPE/DPE behavior, DBB/DIB interpretation and acceptable leakage criteria where applicable.
Cavity pressure relief	Confirm how trapped body-cavity pressure must be relieved and whether external relief piping is required.
Bore / pigging	Specify full bore for piggable lines and confirm minimum bore / end-to-end constraints from the piping specification.
Operator and torque	Give manual gear or actuator requirements plus any torque margin, stem extension, locking or position indication needs.

Selection Logic

Pipeline DBB Selection Depends on Seat and Cavity Philosophy

For trunnion ball valve applications, the phrase DBB is not enough to define the seat behavior. Projects may also define single-piston or double-piston seat effects, cavity pressure relief and isolation direction. These requirements influence the seat system, body cavity behavior and testing. The approved valve datasheet should therefore control the final design.

Application and isolation function

Pressure / temperature boundary

Material compatibility

Connection interfaces

Operation and access

Testing and documentation

Project Application

Pipeline RFQ Data for Trunnion Mounted DBB Valves

Send the line class, P&ID tag, size, pressure class, design standard, bore, end connection, body/ball/stem/seat materials, seat philosophy, cavity relief requirement, operation, buried or above-ground installation, stem extension if needed, service fluid, corrosion / sour-service requirements and inspection plan.

For final selection, use the project valve specification, piping class, instrument hook-up drawing or approved datasheet as the controlling document.

Factory & Quality Evidence

Review Supplier Evidence Before PO

Buyers can review YINKE VALVE factory information, quality documents, sample inspection records and project references before technical and commercial confirmation.

Factory & Production Quality & Certificates Project References Send RFQ

Buyer Questions

Trunnion Mounted DBB Valves FAQ

What is the key difference between a trunnion DBB valve and a standard trunnion ball valve?

The DBB requirement adds a defined isolation-and-bleed function. The project must specify how the closure and bleed arrangement is achieved and verified.

Should SPE and DPE be stated in the RFQ?

Yes when the project specification uses these seat philosophies. They affect cavity pressure behavior and the required isolation function.

Is API 6D always required for a trunnion DBB valve?

Not automatically. API 6D is common for pipeline ball valves, but the governing design and test standards must come from the project specification and datasheet.

RFQ Checklist

Information to Send for Review

Line size and pressure class

Applicable design / test standards

Full / reduced bore

Body / ball / stem materials

Seat material and SPE/DPE philosophy

Cavity relief requirement

End connection / facing

Gear / actuator / stem extension

Service / sour-service requirements

ITP and documentation

Technical data is confirmed against the final quotation, approved drawings and project specification.

Need a DBB Valve Quotation?

Send the valve list, datasheet, P&ID or instrument hook-up drawing for technical and commercial review.

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