Monthly Archives: July 2018

Double Block and Bleed Valves

The Double Block and Bleed is a special feature that you can find among our Trunnion Ball Valves and Expanding Gate Valves. The idea of having DBB was first created by engineers. According our our ValveMD, “The DBB feature of the valve or valves is the ability to segregate two pressure sources and to bleed/vent pressure in the void between the two sealing elements (blocks). The bleed may be in the pipework/pipeline when two valves are used, or in the valve body between the two seats when the valve has the Double Block and Bleed (DBB) feature.”

You may find Double Block and Bleed valves in many types of industries, including; Gas and Liquid pipelines, Production, Processing Oil and Gas, and more. This feature ensures zero leakage which is why they are popular in pipelines. 

Do not be confused with Double Isolation Bleed which according to API means, “API 6D defines a Double Isolation & Bleed Valve (DIB) as a “single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the seating surfaces. The note adds that this feature can be provided in one or in both directions.”

For any questions regarding our Double Block and Bleed Valves, be sure to reach out to one of team members. 

Double Block and Bleed

3″ ANSI 900 API 6D Trunnion Ball Valves, F316 Stainless Steel for CO2 Applications

What does it mean to be API certified?

When a valve manufacturer is API 6D certified it means that they have a certificate that certifies their valves are tested to API standards. There are different specifications of API. For instance, API 6D is a specification for pipeline valves. “API 6D specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, and gate valves for application in pipeline systems.” 

Not only are our Trunnion ball valves API 6D certified but we also carry the API Q1 specification. This allows us to mark our valves. When you see this mark you will immediately know that GVC valves have been manufactured in a quality management system. 

What does it mean to be API 6D and API Q1 certified? Global Valve and Controls is recognized by API and other industries for our product quality. It also means that every single one of our products are marked therefore if  any future questions arise of a valve we will know exactly which valve it is.

What does it mean to our clients? Proof that our products are API as well as meet the specifications and our quality is consistent. Our clients are also aware that we have a management system in place that provides any assurances. 

In conclusion, we stand behind our products 100%! If you are not satisfied with our service or our products please contact us so that we can fix it immediately.