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A double block and bleed valve is used where double isolation is required for ensured leak tightness and safety, manufactured as a modular one-piece design. The DBB valves can be used for the following services:
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&#; Pressure instrument isolation.
&#; Purge points.
&#; Vents.
&#; Drains.
&#; Sample points.
&#; Injection points.
&#; Process flow isolation.
Under certain conditions, double block and bleed systems are needed to prevent product contamination; they can also be considered for the onstream isolation of equipment if the fluid is flammable or hazardous, or if the liquid is in high-pressure or high-temperature service.
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