Gat No. 129, Near SM Mart, Ganesh Nagar, Talawade, Pune - 411062, Maharashtra, India
We are leading DBB Valve manufacturer in Pune. Ultraweld coat are the best DBB Valve suppliers in Pune. A Double Block and Bleed (DBB) valve is a type of valve system used primarily in industrial applications to ensure safety and integrity in pipeline systems. It is designed to provide two independent sealing points and a space (known as the "bleed" or "drain") between them. This setup is crucial for safe maintenance and isolation of sections of a pipeline. We are Pune's top manufacturer of DBB Valves.
Double Block and Bleed valves guarantee critical safety and isolation:
Provides two isolation barriers and a bleed port to prevent product contamination and protect personnel.
Double barrier design ensures reliable shutoff even in severe conditions.
Meets strict industrial regulations and safety mandates for isolation.
Simple actuation design allows rapid isolation of pipeline blocks.
Features
DBB valves include two separate valves (often ball valves) arranged in series. Each valve acts as an independent sealing point.
This space can be vented or drained to detect any leakage through the valves, enhancing safety.
Designed and manufactured according to international standards (e.g., API, ASME, ISO) to ensure reliability and safety.
Enables safe isolation of pipeline sections for maintenance, reducing the risk of spills or leaks.
| Double block and bleed (DBB) | Double isolation and bleed (DIB) | |
|---|---|---|
| Seats | Two seating surfaces that together seal against pressure from both ends | Two seating surfaces, each able to seal on its own against pressure from one side |
| Bleed | The cavity between the seats can be vented or drained | The cavity between the seats can be vented or drained |
| Second barrier if one seat leaks | Not provided by the same valve | Provided by the other seat |
The two terms are often used loosely. If your procedure needs two proven barriers against pressure from one direction, say so in the enquiry, because that calls for a double isolation and bleed design.
The traditional arrangement is two block valves with a bleed valve between them. A DBB valve combines all three in a single body, which:
Compact DBB valves are common on instrument take-offs, sampling points and chemical injection connections.
The blocks are usually ball valves, with a needle or ball valve as the bleed. For abrasive, sour or high-temperature service the balls and seats can be built as metal seated trim with hard-coated, lapped sealing faces.
A DBB valve seals against pressure from both ends with a bleed between the seats. A DIB valve has two seats that each seal independently, so there is a second barrier if one seat leaks.
A DBB valve replaces two block valves and a bleed valve with a single body. It is shorter and lighter, which matters on skids and offshore, and it has fewer flanged joints that could leak, while giving the same block, bleed and block function.
Close both block valves, then open the bleed between them. The pressure trapped in the cavity vents. If no further flow appears at the bleed, both barriers are holding and the line is isolated; continued flow shows that one of the seats is passing.
Last updated:
Get Free Quote