DBB Ball Valve

Description

Description
DBB Ball Valve is a double close and double drain (double break) relief valve.
The key to the working principle of the valve with double closing, double breaking and discharge functions is the action of the two sealing slides installed on the cock. If you want to know more about it, please contact us!

Valve closed:
When the valve is closed, first rotate the hand wheel and rotate the cock and sealing sliding plate by 90 °. Then, the user moves the cock downward, and with the movement of the cock, the sealing sliding plate is pushed towards the cover of the inner cavity of the valve body. Until the elastic sealing ring is evenly squeezed to the upper and lower ends of the valve hole to form a seal.

Valve opening:
When the valve is opened, first rotate the hand wheel to lift the cock and pull the sealing sliding plate back from the sealing surfaces on both sides of the valve body. Then, when the sliding plate is fully retracted and separated from the sealing surface of the valve body, continue to rotate the handwheel. This makes the cock and seal slide rotate 90 °, and the valve is in the open position.
Advantages of DBB and DIB Valves
And then we will briefly introduce the applications and advantages of DBB and DIB. DBB or DIB valves can provide isolation in the upstream and downstream directions. It can be used even under high pressure or high temperature. This isolation is critical in cases where leakage through the valve may have significant consequences. Once the fluid is isolated, the discharge mechanism can discharge the area between two valves or two seating surfaces. This is important for maintenance or integrity checks that can monitor leaks.

Both DBB and DIB valves save space. And it reduces the need for expensive multi valve systems. It also provides zero leakage capability from upstream to downstream. Such a valve also allows the integrity of the seat seals to be checked. In the field of oil and gas, double plugging and relief valves and double isolation and relief valves can be used in a variety of applications and markets. For example, liquefied natural gas, petrochemical, transmission and storage, and natural gas industrial processes. There are also main pipes and manifold valves in liquid pipelines, as well as refined product delivery pipelines. DBB gate valves have through conduit and double block discharge features and fully protected seating surfaces. Therefore, it is suitable for liquid pipeline applications.

Application of DBB Ball Valve
Both DBB and DIB are used in applications that require critical isolation. This ensures that no leakage occurs. What type of choice depends on the type of application and service. For example, in liquid services near waterways or municipalities, double expansion gate valves with DBB capability are preferably used for critical isolation. Because they provide tight mechanical seals upstream and downstream at the same time, they are usually not affected by pressure changes or vibration.

Another application using DBB and DIB valves is instrument calibration. Each shut-off valve in the instrument system must be tightly sealed. Even small leakage will lead to instrument calibration errors, and incorrect instrument factors will continue until the next calibration operation. So this may cause huge money to end users. Selecting the right API-validated DBB Ball Valve or DIB valve can help ensure that the correct calibration is performed almost every time.

The mechanical wedge action of the double check valve compresses the upstream and downstream seals against the valve body. This means that no help from line pressure is required to affect the positive seal. When determining whether to use DBB Ball Valve or DIB valves and which definition (API or OSHA) to follow. So it is important to clearly understand similarities and differences. It is also important to consider the specific application of the valve and ensure that the characteristics required for isolation are fully tested during the factory acceptance test of the valve.