Pilot Operated Cold Gas Thrusters
Overview
The cold gas triad thruster was also flight qualified for the launch and hypersonic vehicle markets as the vehicle’s attitude and roll control system. The pilot operated cold gas thruster is a perfect solution for packaging multiple thruster configurations into a single component design, reducing system complexity and integration effort. With all units thrust is linear with inlet pressure and will continue to operate to low pressures in blowdown cases. The design is flexible and can be configured with canted or right angle side channels with either a simplified block type manifold or custom design, skin integrated configuration.
| Model | 50-820
|
50E1289 |
58E1000 | 58E166 | 50E937 |
| Characteristic | Three individual pilot actuated, normally closed, cold gas thrusters packaged into a single housing. | High pressure isolation version of the 50-820. | Single stage, pilot operated, high pressure isolation valve or cold gas thruster. | Single inlet, high flow capable pilot operated, 2 channel cold gas thruster in a “bow tie” configuration. | Three independent, pilot operated cold gas thrusters mounted in a single, skin mounted module, with inlet filtration, integral back-EMF suppression diode board, and electrical connector. |
| Materials of Construction | Stainless Steel, Aluminum | Mostly Stainless Steel | Mostly Stainless Steel | Aluminum, Stainless Steel | Aluminum, Stainless Steel |
| MEOP / Proof / Burst Pressure | 2500 psig (173.4 bar) / 3750 psig (259.6 bar) / 6250 psig (432 bar) | 4000 psig ( 277 bar) / 9000 psig ( 622 bar) / 15000 psig (1034 bar) |
6000 psia (413 bar)/ 9000 psia (620 bar)/ 15000 psia (1034 bar) |
720 psia (49.6 bar)/ 1080 psia (74.5 bar)/ 1800 psia (124 bar) | 3180 psia (219 bar) / 4770 psia (329 bar) / 7950 psia (548 bar) |
| Minimum Operating Pressure | 100 psid (6.9 bar) max | 200 psid (13.8 bar) max | 200 psid (13.8 bar) max | 100 psid (6.9 bar) max | 150 psid (10.3 bar) max |
| Atmospheric Thrust | Thruster 1&3: 11.75lbf (52N) at 2,000psi Thruster 2 (center): 23.5lbf (105N) at 2,000psi |
Thrust can be tuned to meet customer requirement up to 36.5 max lbf. | Thrust can be tuned to meet customer requirement up to 104 max lbf at 4 ksia. | 110 lbf (489 N) at 600 psia with GN2 (vacuum) | 37.5 lbf (167N) at MEOP with GN2 |
| Internal Leakage | ≤ 10 scc/min GN2 per seat | ≤ 10 scc/min GN2 per seat | < 1 x 10-3 scc/sec GHe at MEOP | < 20 sccs GN2 at MEOP | <12 sccm GN2 at MEOP |
| External Leakage | < 30 scc/min GN2 entire module | < 30 scc/min GN2 entire module | < 1 x 10-3 scc/sec GHe at MEOP | < 50 sccs GN2 at MEOP | <12 sccm GN2 at MEOP |
| Voltage | 24 to 34 vdc for 20 ms | 28 Vdc nominal pulse for 20 ms | 28 Vdc nominal pulse for 20 ms | 28 Vdc nominal pulse for 20 ms | 24 to 32.5 Vdc for 20 msec |
| Hold Voltage | 15 Vdc hold | 18 Vdc hold open | 10 Vdc hold open | 12 Vdc hold open | 12 Vdc nominal hold for 60 sec max. |
| Response | <10 msec open and close | <10 msec open and close | <10 msec open and close | < 50 ms open and <20 ms close | <20 ms open and close |
| Filtration | None | None | None | None | 25 micron absolute |
| Thermal | -105°F to +160°F (-76°C to +71°C) | -40 to 60°C (-40°F to 140°F) | -65 to 240°F (-54 to 116°C) operating (by similarity) | -65 to 160°F (-54 to 71°C) | -11°F to 142°F (-24°C to 61°C) |
| Cycle Life | >6000 | >1000 | >5000 | >3000 | >1500 |
| Mass | 0.95 lbm (0.43 kg) max | 2.2 lbm (1 kg) max | 1 lbm (0.45 kg) max | 5 lbm (2.3 kg) max |
7 lbm (3.2 kg) max |
| Options | Thrust levels can be varied by changing its orifice diameters or inlet pressure. | Isolation valve or thruster. Thrust levels can be tuned to customer requirements. | Additional channels can be added to the single channel design. Can be isolation valve or thruster. | Integral 36Vdc Zener diodes in the electrical circuit | Integral diodes in electrical circuit |
