Name: Double Block And Bleed Trunnion Mounted Ball Valve
Availability: InStock

GEKO Double Block & Bleed (DBB) Valve – Compact Isolation with Zero Leakage Assurance

Size Range

1/2" to 12" (DN15 to DN300), larger sizes available on request

Body & Bonnet Material

A105 / LF2 / F304 / F316 / F316L / Duplex / Super Duplex / Inconel / Monel

Temperature Range

-46°C to +250°C (optional extended range up to 400°C)

Pressure Rating

ASME Class 150 – 2500 (PN16 – PN420)

Valve Type

Double Block & Bleed – Ball / Plug / Needle type bleed design

Seat Material

PTFE / RPTFE / PEEK / Metal-to-Metal (Stellite / Inconel Overlay)

Stem / Shaft Material

SS316 / SS316L / 17-4PH, anti-blowout design, optional hard coating

Bolts & Nuts

B7 / B8 / L7 / B8M with 2H or 4/7 Nuts per ASTM A193/A194

Packing & Gland

Graphite / PTFE / low-emission packing, live-loading design

End Connection Options

Flanged (ASME B16.5 / EN1092), Screwed (NPT / BSPT), Socket Weld (SW),
Butt Weld (BW, ASME B16.25), Hub / Clamp connections available

Operation Method

Manual Lever / Gear / Pneumatic / Hydraulic / Electric Actuator

Design Standards

API 6D / API 598 / ASME B16.34 / BS EN ISO 17292

Testing & Inspection

Pressure & Leakage Test: API 598 / ISO 5208
Fire Safe: API 607 / ISO 10497
NDT: RT / UT / MT / PT as per customer requirement
Helium Leak Test optional

Design Features

Two independent sealing barriers with bleed port, compact design, fire-safe & anti-blowout stem, low torque, full bore flow, easy maintenance

Applicable Medium

Oil & Gas, Petrochemical, LNG, Chemical Process, Utility Gas, High Pressure Steam

Installation Orientation

Horizontal or vertical mounting; vent / drain port available for safe pressure release

Testing & Certification

EN10204 3.1 / 3.2 Material Certificates, PMI / NACE MR0175 / MR0103 compliance, ATEX & PED certified on request

Key Highlights

Zero leakage, compact structure, fire-safe design, double sealing integrity, easy maintenance, suitable for isolation and venting in high-pressure systems

GEKO Double Block and Bleed Trunnion Mounted Ball Valve

Each valve integrates two independently operated trunnion-mounted ball

valves within one body, separated by a central cavity equipped with a drain

valve. This configuration enables operators to safely vent, test, or drain the

intermediate chamber, confirming tight shut-off on both sides.

Both valves retain all the premium features of GEKO’s side-entry trunnion

ball valves, including:

* Floating independent seat rings for reliable sealing under variable pressures.

* Single Piston Effect (SPE) or Double Piston Effect (DPE) seat design,

depending on customer requirements.

* Availability in soft- or metal-seated configurations, suitable for a wide

range of fluids and operating conditions.

* Optional internal overlay and extended stem for buried or insulated pipeline

applications.

* Compatible with all standard actuation methods (manual, pneumatic, electric,

or hydraulic).The result is a robust and compact DBB solution offering higher

safety, reduced maintenance, and minimal pressure loss.

Advantages：

- Compact twin-valve design reduces face-to-face length and total weight.

- Ensures complete isolation and safe pressure venting between two barriers.

- Lower installation and maintenance costs with enhanced operational safety.

- Flexible configuration suitable for both low and high-pressure systems.

GEKO Double Block and Bleed Trunnion Mounted Ball Valve Twin Ball Valve

Key Features：

* Design Type: 1/3 Piece Body, Full or Reduced Bore

* Operation: Trunnion Mounted, Double Block and Bleed (DBB)

* Seat Design: SPE/DPE configuration, Spring-Loaded Seats

* Safety & Reliability:

- Anti-Blowout Stem & Anti-Static Device

- Fire Safe Design per API 607 / API 6FA / ISO 10497

- NACE MR0175 Compliance for sour service

- Sealant Injection System for emergency sealing

* Performance Range:

- Size: 1" ~ 24"

- Pressure Class: ASME 150 – 2500 / API 2000 – 15000

- Design Standards: API 6D, API 6A, ASME B16.34

* Material Options:

- Stem Material:

* ≥205 MPa yield for 150/300 LB

* ≥360 MPa yield for 600/900 LB

* ≥450 MPa yield for 1500/2500 LB

- Seat Material:

* PTFE, RPTFE, DEVLON, or PEEK (varies by size and pressure class)

  Product Introduction

   DBB ball valve - English

Oil & Gas Pipeline Systems
Used in transmission pipelines, metering skids, pump and compressor stations for safe double isolation and bleed function. Ideal for upstream, midstream, and downstream operations where absolute shut-off and maintenance safety are required.

Operating Conditions: High pressure (Class 600–2500), flammable and hydrocarbon media, outdoor environments, compliance with API 6D & API 607 fire-safe standards.
Petrochemical & Chemical Processing
Provides secure isolation and drainage for refineries, cracking, and alkylation units. Designed to handle aggressive acids, caustic, and solvent fluids in process plants and chemical transfer systems.

Operating Conditions: Corrosive and toxic media, temperature variations from -50°C to +400°C, anti-corrosion alloys such as Duplex, Monel, and Inconel ensure long service life.
LNG & Cryogenic Applications
Engineered for liquefied gas handling systems including LNG storage, vaporization, and terminal loading. The dual-ball configuration ensures complete isolation during low-temperature maintenance operations.

Operating Conditions: Ultra-low temperature service down to −196°C, cryogenic-grade PTFE/PCTFE or metal seats, extended stem design for cold box installation.
Power Generation & Energy Systems
Applied in gas turbine fuel lines, steam control systems, and high-temperature boiler isolation. The trunnion-mounted ball structure ensures minimal torque and leak-free sealing under high thermal stress.

Operating Conditions: High temperature up to 400°C, high pressure steam or gas, fire-safe to API 6FA / ISO 10497, anti-static and blowout-proof stem design.
Marine & Offshore Installations
Used in offshore platforms, FPSO manifolds, ballast water systems, and crude loading skids. Compact twin-ball body design minimizes weight and space on deck installations.

Operating Conditions: Salt mist and seawater corrosion, vibration and offshore humidity, Super Duplex or Inconel materials with explosion-proof actuators.
Pharmaceutical & Food Industry
Ensures hygienic isolation and precise drainage in sterile gas and liquid systems. Suitable for clean-in-place (CIP) and sampling applications requiring full bore and smooth flow.

Operating Conditions: Medium pressure, clean and non-contaminating service, 316L stainless steel and FDA-approved PTFE seats for sanitary environments.
Hydrogen & Carbon Capture Systems
Optimized for hydrogen fueling, CO₂ compression and CCUS projects. The DBB valve design provides leak-tight isolation for safety-critical gas applications.

Operating Conditions: Extremely high pressure up to 600 bar, hydrogen permeation control, NACE MR0175 compliant materials, low temperature resistance.
General Industrial & Utility Services
Ideal for compressed air, nitrogen, cooling water, and lubrication systems. Provides compact, reliable shut-off with minimal maintenance requirements.

Operating Conditions: Standard industrial temperature and pressure range, frequent operation cycles, durable soft or metal seat configurations.

Hot Tags :

GEKO Double Block and Bleed Trunnion Mounted Ball Valve

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DBB Ball Valve ASME 150–2500LB

Fire Safe DBB Ball Valve API 607

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Double Block & Bleed Ball Valve Manufacturer API 6D & Fire Safe DBB Valve Manufacturer

Double Block And Bleed Trunnion Mounted Ball Valve

DBB The GEKO Double Block and Bleed Trunnion Mounted Ball Valve is engineered for maximum safety, reliability, and performance in critical process applications. Featuring a twin ball design within a single valve body, this valve provides true double isolation and bleed (DBB) functionality — ensuring complete separation between upstream and downstream flow lines. It is widely used in pipelines, pumping and compression stations, offshore and onshore facilities, cryogenic systems, and high-temperature or abrasive services. The compact twin-ball configuration reduces both installation space and overall weight, delivering exceptional cost efficiency and enhanced line integrity.