Multi-Function Valves

ITAR-Free Multi-Function Control Valves for Electric or Chemical Satellite Propulsion

Performs several functions in one component; Pressure Regulator, Flow Regulator or Isolation Valve.


The MFV offers many of the high performance features demanded by Ion and Hall thruster satellite and spacecraft propulsion systems – and has been successfully tested with remarkable results.

 
This unique patented design can reduce weight and cost by as much as 50% when compared to traditional systems.
During the GOCE mission, the Marotta Controls Multi-Function Valve was operationally powered for over 30,000 hours.
Features:
  • Potentially reduces the number of Xenon feed system components
  • Reduced weight when compared to a regulator based system
  • Provides propellant isolation, tight shutoff and precise mass flow delivery
  • Normally closed isolation demonstrated to internal leakage rates less than 1×10 -5  sccs GHe at pressures of 3.4 bar to 150 bar (50 to 2,175 psia) and temperatures from -54°C to 93°C (-65°F to 200°F)
  • Precise, modulating closed loop pressure/flow regulation (pressure, flow rate or anode current feedback) from 0° to 70°C (32°F to 158°F)

 

  • Electronically adjustable set-point demonstrated to mass flow turndowns greater than 25 to 1 and pressure reductions of 6,000 to 1
  • Can also be used as a pressure regulator and is capable of regulating tank pressures of 150 bars down to 2.5 bars in a single stage
  • Can also operate as an open/closed 2-way valve
  • Magnetostrictive actuator where poppet position is proportional to applied current
Mission Success

As part of the GOCE mission, Marotta’s MFV provided the precise dynamic control of Xenon to the electric ion thruster to continuously adapt the thrust level to compensate for any drag from the upper atmosphere due to GOCE’s extremely low orbit. The precise control provided by the MFV also enabled the optimization of fuel usage which contributed to the planned 20 month mission extending to 55 months


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NOTE: The listed performance data may represent specific program requirements and not the design limitations of the technology.