SB Series Single Block and Bleed Valve
DB Series Double Block and Bleed Valve
|Connection Size||1/4" to 3”|
|Bore Size||10 mm to 50 mm|
|Pressure Rating||ANSI CLASS 150 to 2500 (up to 10 000 psi)|
|Temperature Rating||–29 °C to 120 °C|
|Design and Manufacture Standard||ASME B16.34 Standard|
|Face to Face Dimension||Manufacturer’s Standard|
|Fire Safety Design||API 607 Standard|
|Inspection and Testing||API 598 Standard|
|C||A182 F51||SS304||R.PTFE + GLASS||NBR (AED)|
|D||INCONEL 625||A105||R.PTFE + CARBON||NBR|
|E||MONEL 400||MONEL 400||PEEK||SILICON|
During normal operation, the integral block and bleed valves are set in the conﬁgurations as illustrated below, with the block valves opened and the bleed valves closed to allow normal ﬂuid ﬂow.
To perform positive isolation in a single block and bleed valve assembly, the block valve is ﬁrst closed and then the bleed valve is opened to allow the shutdown side to be drained or vented. Similarly, in a double block and bleed valve assembly, the two block valves are ﬁrst closed to achieve isolation from both the upstream and downstream process ﬂow. This creates a cavity between the block valves, which is then removed by opening the bleed valve.