Bang Bang Regulator

The Moog 51E343 bang-bang regulator is a normally closed, dual seat, series redundant solenoid valve. When electrically commanded the valve will open allowing the flow of propellant. Continuous voltage is required to maintain the valve in the open condition. There are two coils per assembly, one for actuating each seat. Each valve can be operated independently.

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Materials of Construction	Stainless Steel, Vespel
MEOP / Proof / Burst Pressure	120 / 180 / 240 bar (1740 / 2610 / 3480 psia)
Operating Voltage	24 – 34 Vdc pulse, 4.0 ± 0.1 Vdc holding voltage
Drop Out	3.75 Vdc max at 120 bar (1740 psia) inlet and 50^oC (122^oF)
Coil Resistance	74.5 ohms nominal at 20⁰C (68⁰F) each coil
Insulation Resistance	>1 Mohm at 500Vdc, 60 sec, all leads to body
Response	< 10 ms
Minimum Actuation Voltage	< 20 ms
Internal Leakage	< 1.0 x 10-3 scc/sec per seat
External Leakage	< 1.0 x 10-6 sccs GHe at MEOP
Cycle Life	1,000,000 per seat
Mass	220 g max
Random Vibration	22.4 grms overall X axis – in plane 18.8 grms overall Y axis – out of plane 23.9 grms overall Z axis – axial
Thermal Cycle	-20 to 70^oC (-4 to 158^oF) non-operational -20 to 60^oC (-4 to 140^oF) operational
Other	Flying leads
Heritage	DS-1, SMART-1, DAWN, Rapid Eye, Hayabusa-2, Small GEO

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