Views: 0 Author: Site Editor Publish Time: 2023-12-28 Origin: Site
The operational principle of the double block and bleed ball valve (DBB ball valve) unfolds as follows:
When in the closed configuration, the ball snugly mates with the valve seat, thereby generating the initial sealing barricade. This barricade functions with great efficacy in impeding the onward progression of the medium within the pipeline, guaranteeing that the upstream fluid remains firmly contained and does not seep downstream. In so doing, it accomplishes the foremost blocking task encapsulated within the "double block" concept, much like a steadfast bulwark that secures the medium in place.
Simultaneously, it is commonplace for such ball valves to be outfitted with a venting mechanism. In the event that the valve is in the closed stance and there exists a minuscule quantity of leaking medium sandwiched between the valve seat and the ball, these stray droplets will navigate along the purposefully engineered vent channels, ultimately congregating at the vent for expulsion. This is precisely what is denoted by the term "double bleed". On the one hand, it safeguards the integrity and purity of the medium coursing through the pipeline, precluding any mingling of leaked substances with the downstream system. On the other hand, it affords operators the means to promptly identify latent sealing flaws and institute requisite maintenance and inspection procedures.