Pneumatically Pilot Operated Two Stage Valves
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Overview:
The poppet is inlet pressure balanced to minimize the actuation forces required for operation and the associated size & mass of the entire pilot stage. The following is a list of typical performance characteristics which may be tailored as required for specific application needs.
Characteristics | Performance / Interfaces |
Materials of Construction | Primarily Stainless Steel |
Operating Media | GHe, LOx, Ethanol, IPA, DI H2O, GN2 |
MEOP / Proof / Burst Pressure | 390 / 488 / 585 psig (27 / 34 / 40 bar) |
Pilot gas pressure | 550-650 psi (38 - 45 bar) |
Flow Delta P | 1.75 lbm/sec (3.86 kg/sec), < 20 psid (<44 bar) H2O |
Internal Leakage – main seat | <0.2 sccs GN2 |
Internal Leakage – pilot | <0.002 sccs GN2 |
External Leakage | Same as internal leakage |
Voltage | 20-33 Vdc nominal initial, step down to 10 Vdc nominal for continuous open |
Coil Resistance | 36 ohms nominal at ambient |
Response | <50 ms, open or closed |
Pull In | <0.5 Amp |
Temperature Range | -330 to 100°F (-201 to 38°C) operating |
Cycle Life | >5000 |
Mass | < 2.0 lbm (<4.4 kg) Additional weight optimized is possible |
Heritage | Kistler K-1 OMS Engine |