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Isolation & Bleed Valve Collections

Double Block & Bleed Valves

Use this DBB collection to choose the valve architecture before pressure class, materials and end connections are fixed. Compare integral, double ball, trunnion mounted, instrument and monoflange designs by installation space, line function, isolation philosophy and maintenance access.

DBB Valve FamiliesPipeline / Process / InstrumentCompact IsolationRFQ-Driven Selection

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Double Block & Bleed Valves engineering collection

Related Collections

DBB Valve Designs

Use the related collection pages to keep valve architecture, installation function and buyer intent separate.

INTEGRAL BODY

Integral Body

Integral DBB Valves

Compact body architecture that combines two isolation points and a bleed path to reduce external joints and installation envelope.

Compact process and pipeline isolation

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TWO BALL CLOSURES

Two Ball Closures

Double Ball DBB Valves

Two ball closure elements with a bleed cavity between them for positive isolation arrangements defined by the project specification.

Two closures + bleed cavity

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PIPELINE DBB

Pipeline DBB

Trunnion Mounted DBB Valves

DBB configurations based on trunnion-supported ball construction for pipeline duties where size, pressure class and seat philosophy drive selection.

Pipeline and higher-duty isolation

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INSTRUMENT CONNECTION

Instrument Connection

Instrument DBB Valves

Compact block-and-bleed assemblies for gauges, transmitters, sampling and pressure instrument hook-ups.

Gauge / transmitter / sampling

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FLANGE-MOUNTED DBB

Flange-Mounted DBB

DBB Monoflange Valves

Flange-mounted compact DBB assemblies that connect process isolation and instrument take-off at the nozzle with fewer external joints.

Direct process flange interface

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Buyer Selection Matrix

Choose the DBB Architecture by Installation Function

Reduce external joints in a process line	Start with an integral DBB design and confirm bore, end connections, bleed arrangement and operator layout.
Two ball closures in one assembly	Review a double ball DBB design and define the required cavity, bleed port and independent isolation behavior.
Pipeline / larger-bore project duty	Review trunnion mounted DBB valves and confirm seat design, cavity pressure relief and project testing requirements.
Gauge or pressure transmitter take-off	Use instrument DBB valves where a compact isolation-and-bleed hook-up is required close to the instrument.
Direct connection at a process flange	Use a DBB monoflange when the project wants a compact flange-mounted instrument isolation assembly.

Selection Logic

Do Not Treat Every “DBB” Requirement as the Same Valve

“Double block and bleed” describes an isolation function, but the physical valve arrangement can be very different. A pipeline DBB ball valve, a compact integral DBB assembly and a monoflange instrument valve solve different installation problems. The RFQ should therefore define the line function, required isolation arrangement, bleed destination, seat philosophy where relevant, end interfaces and project test criteria rather than relying on the DBB label alone.

Application and isolation function

Pressure / temperature boundary

Material compatibility

Connection interfaces

Operation and access

Testing and documentation

Project Application

What Buyers Should Define Before Requesting a DBB Valve

Start with the P&ID and piping or instrument datasheet. State whether the valve is for line isolation, meter/skid isolation, sampling, gauge connection or transmitter hook-up. Then add size, pressure class or flange rating, body/trim material, bore requirement, end connections, operation, bleed connection, service fluid, design pressure/temperature and documentation scope.

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

Double Block & Bleed Valves FAQ

What is the difference between integral DBB and double ball DBB valves?

Integral DBB describes a compact body concept that combines the isolation and bleed functions. Double ball DBB specifically emphasizes two ball closure elements. A double ball valve can be integral, but the two search intents are not identical.

Are instrument DBB valves the same as pipeline DBB ball valves?

No. Instrument DBB valves are normally selected around compact process-to-instrument hook-up requirements, while pipeline DBB ball valves are selected around line size, pressure class, bore, seat design and pipeline isolation requirements.

What should be confirmed about DBB seat philosophy?

For ball-valve DBB applications, confirm the required isolation behavior, seat arrangement, cavity pressure relief philosophy and any project-specific interpretation of DBB or DIB. The project specification should control the final configuration.

RFQ Checklist

Information to Send for Review

Application / P&ID function

DBB architecture required

Nominal size and pressure class / flange rating

Body, trim and seat materials

Full / reduced bore where applicable

End connections and facing / thread

Bleed / vent connection and destination

Operator and stem orientation

Service fluid, pressure and temperature

Testing, inspection and document scope

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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