10 May To me, double block and bleed always sounded like a move out of the Cobra Kai karate dojo. Of course a double block and bleed valve has. A Block and bleed manifold is a hydraulic manifold that combines one or more block/isolate Applications that use DBB valves include instrument drain, chemical injection connection, chemical seal isolation, and gauge isolation. DBB valves. Our Double Block and Bleed (DBB) Valve range allow you to positively isolate both sides of the valve with a bubble-tight seal, and vent any excess medium.

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The primary function of a double block and bleed system is for isolation and the secondary function is for intervention. Reach Peter Cleveland at This email address is being protected from spambots.

Instrument connections with flammable materials. Through years of innovation, we have taken our initial DBB concept and created a valve solution that dbv now being used all over the world by thousands of operators.

Block and bleed manifold

This type of Double Block and Bleed Valves have a patented design which incorporates two ball valves and a bleed valve into one compact cartridge type unit with ANSI B What is a Double Block and Bleed Valve?

Valve Basics Training to Expand in Preparing for a Plant Outage. They can help determine which one will achieve your objectives best. Subsea Temporary Service Valves. New Washer Application Search Tool. Explosive decompression occurs when gas at high pressure permeates dbg seal materials. For applications that require an additional pressure barrier that seals separately from the main pressure barrier, it is important to use a Bdb valve instead of a DBB to fulfill operational safety requirements.


Considering the operations and procedures executed before an operator can intervene, the Double Block and Bleed manifold offers further advantages over the traditional hook up. Because the valves are full bore with an uninterrupted flow orifice they have got a negligible pressure drop across the unit. Most big websites do this too.

Electric Actuator Commissioning Post: Let’s consider a typical trunnion-mounted ball valve with self-relieving seats. That specification wasn’t always as clear as it could have been in spelling out the difference between DBB and DPI, but the addition in of several notes has clarified it.

DBB and DIB: Which is which?

Valve Basics Training to Expand in However, there is an operational drawback: Introduction to Valves dhb Double Block and Bleed. ViewIn Technology for Mechanical Seals. From Wikipedia, the free encyclopedia.

Remember your login details Advertising: While this may seem like a small matter, he says, it means that some users may think they’ve achieved positive isolation when they haven’t.

Remember selected region and country Analytics: Generally, block Valves should be considered for the onstream isolation of equipment if the fluid is flammable or otherwise hazardous, or if the fluid is in high-pressure or high-temperature service. Coded welders could be required as well. Remember your login details. Our DBB Valves are a smaller unit vs the traditional hook-up, bringing both piping and instrumentation isolation into one unit.


Every valve buyer and manufacturer seems to have a different idea of what the term means for valve selection, which can result in misguided specifications or the wrong choice of valve type. Use information for tailored advertising with third parties Advertising: The minimum flow area of dbh isolation Valve and the inlet area of the pressureRelief Valve can be obtained from the isolation Valve manufacturer and the pressure-Relief Valve manufacturer.

Delivery – Our DBB part machine program was set-up many years ago, in which we machined all aspects of the double block and bleed concept. This outlet isolation shall never be closed while the vessel is in operation without using an inlet isolation Valve that has first been closed with the space between the inlet isolation Valve and the pressure-Relief Valve adequately depressured. It is also vital to take into account the specific application for the valve and ensure that the features required for isolation are fully tested during factory acceptance testing of the valve.