Double Block & Bleed Valves

Engineered for ultimate isolation integrity, Frigate’s Double Block & Bleed (DBB) valves provide dual-barrier protection and a reliable bleed mechanism to ensure maximum safety in high-pressure systems. Our precision-manufactured DBB valves streamline your piping architecture by replacing traditional multi-valve systems with a single, compact, and high-performance unit.

Material of Construction (M.O.C)

CS / AS / SS / DSS / SDSS / SASS / MONEL / HASTELLOY / INCONEL / TITANIUM / TANTALUM

End Connections

NPT / BSP / BSPT / Flanged End Type

Size Range

1/2″ to 3″

Pressure Rating

Class 800# to 2500#

Body Layout Options

Key Block Style, 3-Piece Design, Bar Stock Construction

Order Type

Quantity Range

Lead Time*

Standard Inventory Orders

1 – 25 Units

2 to 3 Weeks

Batch Production Orders

26 – 100 Units

4 to 6 Weeks

Custom / Bulk Orders

101+ Units

8 to 12 Weeks

*Delivery timelines are indicative ranges and may vary based on material availability, custom design configurations, engineering approval cycles, and factory workloads.

Product Description

Frigate’s Double Block & Bleed valves offer a highly engineered, compact solution for process isolation, combining two independent isolation valves and a central drain/bleed valve into a single unit. This robust design minimizes potential leak paths, significantly reduces structural weight and space requirements, and delivers absolute zero-leakage safety in critical lines.

Primary Isolation Mechanisms

Ball Valve Configuration, Needle Valve Configuration

Bonnet Styles

Standard Bonnet, Extended Bonnet (for thermal protection)

Inlet End Connection Variety

Flange-to-Thread Type, Fully Flanged End Type, Threaded End Type

Flow Bore Configurations

Full Bore / Reduced Bore options depending on body sizing

Bleed Valve Operation

Integral manual needle vent / T-bar bleed assembly

Sealing Architecture

High-integrity metal-to-metal or resilient soft-seated sealing options

Fugitive Emissions Control

Low-emission gland packing optimized for high-cycle process isolation

Design Standards Compliance

Built to ASME B16.34, API 6D, and ASME B16.5 standards

Testing & Quality Assurance

100% Hydrostatic shell and seat testing, pneumatic seat testing

Fire Safety Assurance

Fire-safe design capabilities to withstand high-temperature exposure

Nominal Valve Size (inches)

Stem Diameter (mm)

Body Height (mm)

Total Component Length (mm)

1/2″

115

210

1″

135

245

2″

180

320

3″

225

410

Technical Advantages

By integrating three separate valve functions into one specialized housing, our DBB valves dramatically decrease installation labor costs and eliminate the vibration-induced fatigue risks inherent in traditional multi-valve manifolds. Furthermore, the availability of advanced alloy materials and extended bonnets guarantees long-term sealing reliability and reliable thermal management under severe high-pressure or cryogenic operating conditions.

Compliances

ISO 9001:2015

ISO 14001:2015

ISO 45001:2018

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Need reliable valve for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Oil & Gas Processing

Provides absolute, verifiable isolation during routine instrument maintenance, calibration, and line venting on high-pressure upstream and downstream production manifolds.

Petrochemical Refining

Safely isolates aggressive process fluids and toxic chemicals in high-temperature cracking units, protecting personnel and preventing cross-contamination of product streams.

Chemical Manufacturing

Handles highly corrosive media efficiently using specialized exotic alloys like Hastelloy and Tantalum, ensuring leak-free performance in volatile chemical synthesis loops.

LNG & Cryogenic Storage

Utilizes extended bonnet designs to keep critical stem packing clear of extreme cold, maintaining tight shutoff during liquefied natural gas transport and storage.

Power Generation Systems

Manages high-pressure steam isolation and boiler feed-water isolation, minimizing thermal stress on piping networks while allowing safe inline servicing.

Offshore Marine Platforms

Delivers critical space-saving and weight-reducing advantages on space-constrained offshore topsides while offering maximum resistance against harsh saltwater corrosion.

Frigate Approved Quality Management System

At Frigate, quality is built into every stage of manufacturing. Our approved Quality Management System ensures that every material component.

Incoming Material Checking

Before production begins, all incoming materials are checked against specifications, drawings, and supplier documents.

In-Process Inspection

Quality is monitored during manufacturing to prevent defects and maintain process consistency.

Final Dimensional Checking

Finished parts are inspected before dispatch to confirm compliance with customer drawings and tolerances.

Packaging Control

Finished components are packed safely to prevent damage during handling and transportation.

Incoming Material Checking

In-Process Inspection

Final Dimensional Checking

Packaging Control

Quality Document

To help buyers evaluate our quality systems, we provide sample documents that reflect our inspection and reporting standards.

How We Delivered

Complex geometries engineered solutions that move businesses forward.

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Bento Boxes for D2C Segment

Units Manufactured Monthly

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Defence-Grade Cable Supply

Cost savings

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Flange Assembly for Pump

Faster Production

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Having Doubts? Our FAQ

What are the primary space-saving benefits of a Frigate DBB valve?

A traditional double block and bleed system requires two separate isolation valves, a bleed valve, and multiple spool pieces or tees. Frigate’s integrated DBB valve combines all of these components into a single, compact body, reducing physical space requirements by up to 70% and drastically minimizing potential fugitive emission leak points.

Can these valves handle highly corrosive or sour gas fluids?

Yes. Our DBB valves are manufactured in a wide array of high-grade materials of construction (M.O.C.), including Super Duplex Stainless Steel (SDSS), Monel, Hastelloy, and Inconel. These materials are explicitly selected and certified to withstand highly corrosive environments, sour gas, and high-chloride conditions.

When should I specify an extended bonnet configuration?

Extended bonnets are highly recommended for extreme temperature operations, such as cryogenic LNG services or high-temperature thermal oil lines. The extension moves the stem packing away from the extreme process temperatures, protecting the seals from thermal degradation and ensuring smooth, reliable manual or automated operation.

What is the difference between the Key Block and 3-Piece valve designs shown in your technical sheet?

Key Block configurations feature a highly compact, robust block-style body typically suited for tight spaces, instrument isolation, and direct flange-to-thread conversions. The 3-Piece design allows for easier inline maintenance and servicing of internal components, making it ideal for process pipelines where rapid wear-part replacement is critical.

Are your DBB valves fully compliant with international safety and pressure standards?

Absolutely. All Frigate DBB valves are manufactured, hydrostatic tested, and pneumatically verified in strict accordance with major global engineering standards, including ASME B16.34 and API 6D. Our standard pressure rating classes range from 800# up to ultra-high pressure 2500# to fulfill rigorous industrial safety mandates.

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Components Built for Critical Performance

Engineered Products for Critical Applications

Double Block & Bleed Valves

Order Type

Quantity Range

Lead Time*

Product Description

Primary Isolation Mechanisms

Bonnet Styles

Inlet End Connection Variety

Flow Bore Configurations

Bleed Valve Operation

Sealing Architecture

Fugitive Emissions Control

Design Standards Compliance

Testing & Quality Assurance

Fire Safety Assurance

Nominal Valve Size (inches)

Stem Diameter (mm)

Body Height (mm)

Total Component Length (mm)

Technical Advantages

Compliances

ISO 9001:2015

ISO 14001:2015

ISO 45001:2018

Let's Get Started

Industry Applications

Frigate Approved Quality Management System

Quality Document

How We Delivered

Having Doubts? Our FAQ

We'd love to Manufacture for you!

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

Get Your Quote Now

Double Block & Bleed Valves

Get Latest Price

Double Block & Bleed Valves

Get Latest Price