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I-Double Block kanye ne-Bleed Ball Valve
Ivalve ye-DBB “ivalvu eyodwa enezindawo ezimbili zokuhlala okuthi, lapho ivaliwe, inikeze isivalo ngokumelene nokucindezela okuvela kuzo zombili iziphetho zevalvu, ngendlela yokukhipha umoya/yokufaka imbobo phakathi kwezindawo zokuhlala.
