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Double Block and Bleed Ball Valve

Design Standard:API 6D
Pressure-Temperature Rating:ANSI B16.34
Face To Face:ANSI B16.10
Flange End:ANSI B16.50 / ANSI B16.47
Inspection and Test: API 598 / API 6D
Mark:MSS SP-25







Double block and bleed ball valve replace existing traditional techniques employed by pipeline engineers to generate a double block and bleed configuration in the pipeline. Conventionally, in order to achieve a double block and bleed system, engineers would install two standard isolation valves and a separate facility for bleeding the cavity in between. Space is usually at a premium in the refinery environment, and this approach – requiring an additional valve unit to be installed as well as a “T”-junction to allow the cavity to be bled – more than doubles the space required compared with a single valve system. This increase in size can often make the installation unfeasible, especially where multiple valves along the line are to be upgraded.
Double block and bleed ball valve incorporating the three valves into a single housing increases the safety of the system by removing connections between separate units, resulting in fewer potential leak paths. The unit incorporates two separate ball valves, delivering 100 per cent tight shutoff using either plastic soft seats or heavy duty metal-to-metal seats coated with a tungsten or chrome carbide-based coating. The volume of the cavity between the valves is also significantly reduced, allowing operators to evacuate the space and establish a safe isolation more quickly – a major benefit in emergency scenarios. The reduction in volume of the material removed from the valve also means less waste, reduced handling, lower costs and easier disposal.

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Sanqiao Industry Zone, Oubei, Yongjia County, Wenzhou City, Zhejiang Province, China 325105
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