Brief introductions of a DBB Ball Valve and a DIB Ball Valve
When it comes to the seat and sealing of a trunnion mounted ball valve, we often classify them into DBB and DIB type. People usually get really confused about how to differentiate a DBB ball valve from a DIB ball valve.
DBB means double block and bleed. As per API 6D, a double block-and-bleed ball valve is a single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from both ends of the valve with a means of venting or bleeding the cavity between the seating surfaces. There is an additional note that this valve does not provide positive double isolation when only one side is under pressure.
DIB means double isolation and bleed. API 6D defines a DIB valve 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 or bleeding the cavity between the seating surfaces, with an additional note that this feature can be provided in one direction or in both directions.
In other words, a DBB ball valve has two single-piston-effect seats which are internally self-relieving. In the oil and gas application, most of the industrial valve users will use DBB ball valves.
DIB ball valves can be classified into DIB-1 and DIB-2. A DIB-1 ball valve has two double-piston-effect seats. DIB-2 has single-piston-effect design (DBB) for one seat and double- piston-effect design (DIB) for another seat.
(schematic of a DIB ball valve)
(schematic of a DBB ball valve)
DBB means double block and bleed. As per API 6D, a double block-and-bleed ball valve is a single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from both ends of the valve with a means of venting or bleeding the cavity between the seating surfaces. There is an additional note that this valve does not provide positive double isolation when only one side is under pressure.
DIB means double isolation and bleed. API 6D defines a DIB valve 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 or bleeding the cavity between the seating surfaces, with an additional note that this feature can be provided in one direction or in both directions.
In other words, a DBB ball valve has two single-piston-effect seats which are internally self-relieving. In the oil and gas application, most of the industrial valve users will use DBB ball valves.
DIB ball valves can be classified into DIB-1 and DIB-2. A DIB-1 ball valve has two double-piston-effect seats. DIB-2 has single-piston-effect design (DBB) for one seat and double- piston-effect design (DIB) for another seat.
(schematic of a DIB ball valve)
(schematic of a DBB ball valve)
Related News
- Flexible Design of Industrial Pipeline
- Major Safety Facilities in Hazardous Chemical Storage Warehouses
- Intelligent Era: Predictive Maintenance of Valves
- Basic Knowledge of Diaphragm Couplings
- How to Deal with Poor Stability of Pneumatic Valves
- What to Do When the Electric Actuator of an Electric Valve is Overheating?
- Principle of Valve Temperature Controller
- Several operations to avoid during valve installation
- Landee Hosts Successful Visit from Al Prince Engineers, Pakistan
- Chemical Composition and Performance Characteristics of 2507 Stainless Steel Seamless Pipes
News
Newsletter
At XIAMEN LANDEE INDUSTRIES CO., LTD. you will find an extensive range of Industrial Steel Pipe, Steel Plate, Valve, Flange, Pipe Fitting, Fastener, Gasket and other spare parts for industrial use - more than 50 product types available in over 400 sizes and 20 materials, in fact. And our engineers work tirelessly to innovate and improve. We release one new model every month.
Latest News
- Flexible Design of Industrial Pipeline 04 22, 2024
- Major Safety Facilities in Hazardous Chemical Storage... 04 15, 2024
- Intelligent Era: Predictive Maintenance of Valves 04 08, 2024
Useful Links
Contact Us
Mr. Kevin Wang
Tel: 86-592-5204188
Fax: 86-592-5204189
Email: [email protected]
Website: www.landee.cn
Copyright © 1994 - 2024 Xiamen Landee Industries Co., Ltd. All Rights Reserved. Privacy Policy | Terms of Service | sitemap
Website Design & Support: jeawin.com