DBB Ball Valve

DBB ball valve is short for Double Block and Bleed Ball Valve. It is a special type of valve designed to provide positive isolation in critical applications.
DBB ball valve is a single valve unit that has two seating surfaces (upstream and downstream), which can shut off fluid from both sides of the valve cavity, and a bleed or vent port in the middle chamber to release trapped pressure or verify tight sealing.
It integrates the function of two isolation valves and one bleed valve into a single compact valve body.

1.Key Features of Double Block and Bleed Ball Valve(DBB ball valve )

Double Isolation – Two independent sealing surfaces ensure fluid is blocked from both upstream and downstream.
Bleed Function – Cavity vent/bleed port allows pressure relief, leakage detection, or flushing.
Compact Design – Replaces the traditional “three-valve system” (two block valves + one bleed valve), saving space and weight.
Soft or Metal Seats – Can be designed with soft seats for bubble-tight sealing or metal seats for high temperature/abrasive service.
Anti-blowout Stem – Ensures safety in high-pressure operation.
Fire-safe & Anti-static Design (per API 6FA, API 607).
Complies with API 6D & ASME standards.

2.Advantages of Double Block and Bleed Ball Valve(DBB ball valve )

Space & Weight Saving – One valve does the job of three, making piping layouts more compact.
Reduced Leak Paths – Fewer connections mean less risk of leakage compared to separate block and bleed valves.
Improved Safety – Ensures positive isolation and allows safe depressurization of the valve cavity.
Easy Operation & Maintenance – Single unit simplifies installation and reduces maintenance requirements.
Cost Saving – Fewer valves, flanges, and fittings compared to traditional setups.

3.Applications of Double Block and Bleed Ball Valve(DBB ball valve )

DBB ball valves are mainly used in critical process systems where reliable isolation is essential:
Oil & Gas pipelines – Isolation and pressure relief for pipeline maintenance.
Petrochemical plants – Process isolation in high-pressure/high-temperature services.
Refineries – For safe isolation of hydrocarbons.
Power plants – Steam and condensate systems.
Metering & Instrumentation skids – For calibration and safe removal of instruments.
Offshore platforms – Where weight and space saving is critical.