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DSS – Normally Open Atmospheric Reference Valve
The DSS Series diaphragm valve is a GC module with two normally open shut-off valves and an atmospheric reference. The valve is totally free of springs, bellows, packing and lubricants in the process wetted area. Metal-to-metal seals to atmosphere ensure that there is no transport of undesirable elements into the flow stream. Elgiloy® diaphragms ensure the utmost in corrosion resistance and extended overall life span.
- GC fast loop with atmospheric reference
- Surface mount ANSI/ISA-76 compliant*
- Metal-to-metal seals to atmosphere to prevent leakage
- Wide choice of materials for virtually all applications
- Replaceable seats for extended service life
- No dynamic o-rings, springs or lubricant in wetted flow path to eliminate sample contamination
- Very low internal volume 0.231 cc
- Stacked diaphragms for extended service life
- Pneumatic actuation (top actuation only)
- Pressures from vacuum (50 torr) to 500 psig (34 barg)
- Compact package (3˝ L × 2.6˝ H × 1.5″ W)
- Interlocking pins between valve body and manifold baseplate to ensure 100% correct reassembly
*CT-76 base adapter plate required for non-CT-76 manufactured surface mount systems
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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 | 0.20 Cv |
| Valve Internal Volume* | 0.231 cc |
| External Leakage | 1×10-5 cc/sec helium (inboard) |
| Min Actuation Pressure | 50 psig (3barg) |
** Internal volume is defined as area from the main analyzer isolation valve to the analyzer outlet port.
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 |
Operating Pressures
| Operating Pressure* | Vacuum (50 torr) to 500 psig (34 bar) |
| Proof Pressure | 2000 psig (138 barg) |
| Burst Pressure | 8000 psig (552 barg) |
Support Materials
Flow Formulas