Electric Propulsion Proportional Flow Control Valve (PFCV)

101-117-1-ISOLATION-VALVES-grey-bckgrd-700x400.psd


The 51E339 Proportional Flow Control Valve (PFCV) is an all welded, normallyclosed, solenloid-type valve that can provide outlet flow control or pressure regulation in proportion to the input current, within its operating range. The PFCV can be operated directly in an open loop control mode, or automatically in a closed-loop control mode with a downstream telemetry feedback to control the input current. 

 

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Parameter Performance
Materials of Construction Stainless Steel and Vespel
MEOP / Proof / Burst Pressure 186 / 279 / 465 bar (2700 / 4050 / 6750 psia)
Internal Leakage < 1 x 10-4 sccs GHe over inlet pressure range
External Leakage < 1 x 10-6 sccs GHe
Inlet Pressure Range in Regulation Mode 2.8 – 186 bar (40 – 2700 psia)
Outlet Pressure Range in Regulation Mode 2.28 – 2.55 bar (33 – 37 psia) over inlet pressure range and over 6 – 30 mg/s Xe flow range
Inlet Pressure Range in Flow Mode 2.8 -186 bar (40 - 2700 psia)
Outlet Pressure Range in Flow Mode 0 – 2.8 bar (0 – 40 psia) over inlet pressure range up to 200 mg/s Xe flow range
Flow Range 0 – 30 mg/s Xe typical, >200 mg/s Xenon maximum at 186 bar (2700 psia) inlet pressure
Input Current Range

0-140mA maximum sustained (full open)

75mA minimum opening

Throttle Rate <25 ms
Response Time <10 ms open or closed
Coil Resistance 74.5 ± 2 ohms at 21°C (70°F)
Flow Gain <2.5 mg/s Xe per mA at 2.8 bar (40 psia) inlet
Filtration 25 microns absolute inlet
Shock 3000g / 5000 Hz in plane, 6000g / 5000 Hz out of plane
Random Vibration

19.2 grms in plane

24.7 grms out of plane

Thermal

-34 to 100°C (-30 to 212°F) operational

-40 to 125°C (-40 to 257°F) non-operational

Life 1,000,000 cycles
Mass 115 g (0.25 lbm) max
Heritage AEHF, BepiColombo, SGEO, TacSat-2, FalconSat-5, 6, GEOStar, Psyche