Inverted Pressure Balanced DBB Plug Valve

The Inverted Pressure Balanced Double Block & Bleed (DBB) Plug Valve is a high-integrity isolation valve designed for critical process applications where zero-leakage shutoff, safety, and reliability are essential. Unlike conventional plug valves, the inverted pressure balanced design minimizes operating torque by balancing internal pressure forces, ensuring stable operation under high differential pressure conditions. This valve integrates double block and bleed functionality in a single compact body, providing safe isolation between upstream and downstream pipelines while allowing controlled cavity venting.

Reduced Total Cost of Ownership (TCO): The inverted pressure-balanced design drastically reduces operational friction. This allows procurement teams to downsize the required pneumatic or electric actuators, significantly cutting direct hardware, installation, and long-term maintenance costs.

Strict Compliance & Certifications: Fully compliant with NACE MR0175 / ISO 15156 for sour gas ($H_2S$) environments. Fire-safe designs are validated to meet emergency shutdown (ESD) criteria.

Bi-directional Bubble-Tight Shutoff: Independent upstream and downstream sealing elements ensure a reliable seal regardless of flow direction, providing true double isolation for safe downstream maintenance.

Minimized Facility Downtime: A simplified internal structure with fewer wear-prone internal components extends service intervals and simplifies on-site maintenance.

We design and manufacture our DBB plug valves to fulfill the most stringent global project requirements across various pressure classes and aggressive media.

Our inverted DBB plug valves are widely specified by global EPCs and operators for:
Midstream Oil & Gas: Transmission pipelines, pigging stations, and sectional block isolation.
Downstream Processing: Refineries, petrochemical facilities, and high-pressure metering skids.
Clean Energy & Cryogenics: LNG liquefaction plants, storage terminals, and cryogenic transport.
Severe Offshore Environments: Topside platforms, FPSO vessels, and subsea manifold systems.

Every single valve undergoes rigorous testing to ensure zero-defect delivery to your project site.
100% Material Traceability: Supplied with EN 10204 3.1 or 3.2 material certificates, ensuring full chemical and physical pedigree from the foundry stage.
Testing Protocol: Standard testing includes Shell Hydrostatic, High/Low-Pressure Seat Leakage, Cavity Pressure Relief, and Functional Torque Verification.
Non-Destructive Testing (NDT): Radiographic (RT), Ultrasonic (UT), Magnetic Particle (MT), and Dye Penetrant (PT) testing are available based on project specifications.
Third-Party Inspection (TPI): We regularly coordinate with international agencies including SGS, Bureau Veritas (BV), Lloyd's Register, and TÜV Rheinland for witness testing.

We understand that critical infrastructure requires highly tailored engineering solutions. Our dedicated team provides:
Custom Face-to-Face Dimensions: Engineered to perfectly match legacy piping layouts during retrofits without costly pipeline modifications.
Advanced Metallurgy: Custom cladding and hard-facing for highly corrosive or abrasive chemical media.
Full Automation Integration: Complete assembly, calibration, and functional testing of specified global actuator brands (Rotork, Bettis, etc.).
Design Approval Documentation: Provision of comprehensive General Arrangement (GA) drawings and 3D CAD models for design engineering approval prior to casting.