High Pressure Double Block and Bleed (DBB) Valve
Resistant
Sealing
Operation
Long Life
Alis Valves offers High Pressure Double Block and Bleed (DBB) Valves engineered for demanding applications where safety and reliability are critical. These valves provide two independent sealing barriers along with a bleed port to safely release trapped pressure. Built with robust materials and precision engineering, high-pressure DBB valves are widely used in oil & gas, offshore, and high-pressure processing systems.
Specifications
Size Range
DN 15 to DN 250
Body Material
Forged Carbon Steel / Alloy Steel / Stainless Steel
End Connection
Flanged / Butt Weld
Temperature Range
-46°C to 450°C (Depends on Material)
Media
Oil, Gas, Hydrocarbons, Chemicals
Pressure Rating
Class 600 to 2500
Seat Material
PTFE / PEEK / Metal Seated
Operation
Lever / Gear / Pneumatic / Electric
Standards
API 6D / ASME B16.34
Product Images
Frequently Ask Questions
A High Pressure Double Block and Bleed (DBB) Valve is an isolation valve arrangement designed to provide two independent isolation barriers and an intermediate bleed/vent point in high-pressure pipeline and process systems.
Two separate isolation valves can provide double isolation when combined with a suitable bleed arrangement.
A DBB valve integrates the isolation arrangement into a single compact valve assembly, potentially reducing:
Installation space
Number of connections
Potential external leakage points
Piping complexity
A typical sequence is:
Close the upstream isolation barrier.
Close the downstream isolation barrier.
The section between them becomes isolated.
Open the intermediate bleed/vent.
Release trapped pressure.
Verify that the isolation barriers are maintaining the required isolation.
The actual operating procedure should always follow the manufacturer's instructions and the plant's isolation procedure.
Alis Valves is a High Pressure Double Block and Bleed Valve manufacturer and supplier in India, offering DBB valve solutions for oil & gas, refinery, petrochemical, natural gas, chemical and high-pressure process applications. Depending on the required service, DBB valves can be configured with suitable ball design, body material, seat material, pressure class and manual or automated operation.
