Ball Valve With Double Block And Bleed

Double block and bleed valve is a side entry ball valve with either a bolted or welded body designed for use in upstream midstream and downstream oil and gas applications. Sealing is achieved by spring loaded piston type seats which shut off flow when line pres sure acts on the upstream seat. As schneider and also many international valve manufacturers are using the term double block bleed according to osha s definition which means 3 independently operating valves 2 isolation block valves and 1 bleed valve are incorporated in a single valve body and both isolation block valves are sealing in one direction.

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Ball valve with double block and bleed. Dan ex double block and bleed plug valve animation. Dbb and dib ball valve in api 6d standard tips 2. It requires two in line isolation valves and a bleed valve used to drain or vent trapped fluid between the two closure elements in order to safely isolate the downstream pipe. Double block and bleed twin valves dual valves double ball plug db b 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 through a needle valve. Status quo ball valves. It includes options for high pressure critical processes such as our xc range which are all api 6a tested and manufactured in accordance with asme standards. Lately i was often asked about the difference between a floating and a trunnion ball valve.

This would be too much for this post. Double block bleed trunnion type trunnion ball valve have a mechanical means of anchoring the ball at the top and the bot tom this design is the standard design applied on larger and higher pressure valves. With the need for verifiable and maintainable shut off in safety critical applications double block and bleed valves have commonly been used for primary and secondary tight shut off in an attempt to provide and ensure system integrity. The mechanical wedge action of a double block and bleed plug valve such as the cameron general twin seal double block and bleed plug valve firmly compresses both the upstream and the downstream seals against the valve body requiring no help from the line pressure to effect a positive seal.

Api 6d defines a double block and bleed valve as a single valve with two seating surfaces that in the closed position provides a seal against pressure from both ends of the valve with a means of vending bleeding the cavity between the seating surfaces. A double block and bleed valve is like having three valves in one. What is double block and bleed valves. Api 6d defines a double block and bleed valve dbb as a single valve with two seating surfaces that in the closed position provides a seal against pressure from both ends of the valve with a means of venting bleeding the cavity between the seating surfaces.

Well i try to explain it in a few words without going to deep into the technical details.