Pneumatically Pilot Operated Two Stage Valves

Moog Models 54E131 and 54E132 (Ox and F) are pneumatically pilot operated two stage valves designed for use on a LO2 / Ethanol bipropellant engine. A common design is shared by both propellants but with slightly varied test requirements. This valve contains a small solenoid operated 3-way pneumatic valve as a pilot stage for the main stage liquid valve element. The main stage includes a pneumatic actuator piston that is directly coupled to the propellant valve poppet. The actuator is spring biased to provide a normally closed preloaded condition for the soft seat / poppet interface.

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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