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- [URL=https://www.pharmachindia.com/products/double-block-and-bleed-ball-valve]Double Block And Bleed Ball Valve Manufacturers[/URL] - Double Block and Bleed valves assure double isolation function thanks to two obturator inserted in a single body and they provide the bleed function by means of a bleed/vent system located between obturators (body port and ball, gate or needle valve), from the floating ball valve design, TANA DBB valves with several different constructions.