EVOL has developed two series of integral block and bleed valves which are SB Series Single Block and Bleed Valve, and DB Series Double Block and Bleed Valve. These two series are designed to achieve positive sealing in a most compact design.
SB Series Single Block and Bleed Valve
DB Series Double Block and Bleed Valve
Injection of chemicals or other substances into the process stream can be facilitated using the DBB valve with injection quill assembly.
Both series can be customized according to different features and specifications to suit various applications. Our valves are available in stainless steel, carbon, alloy and polymers to accommodate from general to severe applications.
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Features :
Increased speed of delivery
Proven manufacturing performance
Proven manufacturing performance
Designed to ASME B16.34 standard
Surface mounting option available
| Specification | Unit |
|---|---|
| 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 |
| Parts | Body | Trim | Seat | O-Ring |
|---|---|---|---|---|
| A | SS316L | SS316L | DEVLON-V | VITON (AED) |
| B | A105 | CF8M | PTFE | HNBR |
| 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.
