Advantages and practical applications of DBB and DIB valves
Application and advantages of DBB and DIB valves, this article introduces the application and advantages of DBB and DIB. DBB or DIB valves can provide isolation in the upstream and downstream directions, even under high pressure or high temperature conditions. This isolation is critical in situations where leakage through the valve can have significant consequences. Once the fluid is isolated, the discharge mechanism can discharge the area between the two valves or the two seating surfaces. This is important for maintenance or integrity checks that can monitor leaks.
Both DBB and DIB valves save space, reduce the need for expensive multi-valve systems, and provide zero leakage from upstream to downstream. Such a valve also allows for an integrity check of the seat seal. In the oil and gas sector, double plugging and bleed valves as well as dual isolation and bleed valves are available for a variety of applications and markets, such as LNG, petrochemical, transmission and storage, natural gas industrial processes, and mains and manifolds in liquid pipelines. Valves, as well as refined product transfer lines. The DBB gate valve features a ducted and double block discharge feature and a fully protected seat surface for liquid piping applications.
Both DBB and DIB are used in applications that require critical isolation to ensure that no leaks occur. The type of choice depends on the application and service type. For example, in liquid service near waterways or municipalities, DBB capable dual expansion gate valves are preferred for critical isolation because they provide a tight mechanical seal both upstream and downstream, which is generally unaffected by pressure changes or vibrations.
Another application for using DBB and DIB valves is meter calibration. Each shut-off valve in the metering system must be tightly sealed. Even small leaks can cause meter calibration errors and incorrect meter factors will continue until the next calibration operation. This can cause huge money for end users. Choosing the right API-validated DBB or DIB valve can help ensure that the correct calibration is performed almost every time.
The mechanical wedge action of the double check valve presses the upstream and downstream seals against the valve body, which means that no assistance from line pressure is required to affect the positive seal. Dual plugging and bleeder plug valves that are used extensively in the delivery and storage markets provide consistent and verifiable zero leakage of various fluids. When deciding whether to use a DBB or DIB valve and which definition (API or OSHA) to follow, it is important to have a clear understanding of similarities and differences. It is also important to consider the specific application of the valve and to ensure that the features required for isolation are fully tested during the factory acceptance test of the valve.
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