20 N-class Thruster Valve
| Registration date | 4/15/2009 |
|---|---|
| JAXA development group | Research Unit II, Research and Development Directorate |
| View diagram | See Attachment 1 |
| Environmental resistance | See Attachment 2 |
| Patent number (publication number) |
N/A |
| Reference | N/A |
| Satellite and launch date | To be supplied after launch |
| Note | N/A |
Manufacturer
Moog Japan Ltd.
Hiratsuka-shi, Kanagawa, Japan
https://www.moog.co.jp/
Features
- The valve is long life and highly reliable because of the design to remove sliding parts to the extent possible. Also, contaminant generation from the valve interior is reduced.
- Because of its redundant structure where two solenoid valves with similar functions are connected in series, it is highly reliability with regard to the internal leakage.
- Because the same materials as those used for a proven existing thruster valve are selected, it has the same tolerance of propellant as the existing thruster valve.
Applications
It is placed at the direct upper stream of a thruster combustion chamber of a satellite propulsion subsystem, and used to control the supply and cutoff of propellant.
Specifications
| Property | Specification |
|---|---|
| Type | Solenoid valve, suspended armature type |
| Compatible fluid | N2H4, MMH, H2O, IPA, GN2, GHe |
| Operating pressure | 0 to 2.8 MPaG (gauge pressure) |
| Proof / Burst pressure | 7 MPaG / 10 MPaG |
| Operating temperature range | +4 to +121 °C |
| Rated flow rate | 12.7 g/sec (N2H4) |
| Pressure drop | ≦0.17 MPaD (differential pressure) @12.7 g/sec (N2H4) |
| Operating voltage | 23.5 to 32.5 Vdc |
| Power consumption | ≦35 W @32 Vdc / 4 °C |
| Response time | Open : ≦15 ms @28 Vdc / 2.8 MPaG / 20 °C Close : ≦10 ms @0.7 MPaG / 20 °C |
| Internal leakage | ≦1 × 10-5 scc/s @GHe / 2.8 MPaG |
| External leakage | ≦1 × 10-6 scc/s @GHe / 2.8 MPaG |
| Cycle life | Wet : 1,000,000 cycles Dry : 5,000 cycles |
| Filtration | 25 μm abs (built-in inlet filter) |
| Weight | ≦0.30 kg (excluding lead wire) |
