DBB – Double Block and Bleed Diaphragm Valve
DBB series valves are totally free of springs, bellows, packing, and lubricants in the process wetted area. Metal-to-metal seals to atmosphere to prevent transport of undesirable elements into the flow stream.
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- Integrated sweep loop in manifold
- Double-block-and-bleed on/off control
- Surface mount ANSI/ISA-76 compliant*
- Metal-to-metal seals to atmosphere to prevent leakage
- Replaceable seats for extended service life
- Wide choice of body and elastomer materials
- No dynamic o-rings, springs or lubricant in wetted flow path to eliminate sample contamination
- Very low internal volume (0.16 cc)
- Pneumatic actuation from top or manifold
- Process pressure from vacuum (50 torr) to 500 psig (34 barg)
- Multiple stacked diaphragms for extended service life
- Compact valve body (3˝ L × 1.5˝ W × 2.56˝ H)
- Interlocking pins between valve body and manifold baseplate to ensure 100% correct reassembly (not applicable for surface mount models)
* μMS3® base adapter plate CT11358-[ ] required for non-CT76 manufactured surface mount systems – consult factory
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| Body | 316L Stainless Steel, Monel® and Hastelloy® C-276 |
| Seats | PCTFE and PEEK™ |
| Diaphragms | Elgiloy®AMS 5876 |
| Orifice Size | 0.110˝ (2.8 mm) |
| Flow Capacity | 0.23 Cv |
| Valve Internal Volume* | 0.16 cc |
| External Leakage | 1×10-5 cc/sec helium (inboard) |
| Min Actuation Pressure | 50 psig @ 50 psig process) |
** Internal volume is defined between double block valves.
Operating Temperatures
| Seat Material | ¼-PLUS TURN TEMPERATURE |
| PCTFE | -40° F to +212° F -40° C to +100° C |
| PEEK™ | 0° F to +400° F /-18° C to +204° C |
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