 Product
Overview:
Based on a well-established range of high performance
solenoid valves used in high-pressure fluid control applications,
the SV14 Cold Gas Thruster uses a flat faced seal to reduce
the risk associated with valve internal leakage due to a high
cycle life. Variations in thrust level are achieved by use
of different sized thruster nozzles.
This valve is a single coil solenoid operated thruster valve
comprising of a fixed pole and a suspended moving pole/armature,
to which is attached the sealing feature (poppet) of the valve.
With increasing supply pressure, the stress on the seal will
be increased, but the valve is designed such compression of
the seal will be limited by a mechanical stop on the moving
pole.
The valves are opened by energising the coil, the resulting
force generated by the induced magnetic flux, causes the armature
to move towards the ‘fixed pole’ so retracting
the poppet from its seat. The valve is closed by de-energising
the coil, collapsing the magnetic field. The armature moves
the poppet to the closed position under the influence of the
helical spring and remains closed under the combined influence
of the spring and forces of the working fluid.
Performance Characteristics:
| Operational Temperature |
-35°C to +65°C |
| Operating Pressure |
2.5 bar |
| Vacuum Thrust |
10 mN (± 5%) to 40 mN (± 5%) |
| Coil Resistance |
105 - 115 Ω @ 20°C |
| Power Consumption |
< 3.5 W (Pull-in) |
< 0.7 W (Holding) |
| Response Time |
< 4.0 ms (Opening and Closing) |
| Mass |
< 75 g |
| Maximum O/D |
15.85 mm |
| Cycle Life |
2,000,000 |
| External Leakage |
1 x 10-6 scc/sec GHe
max. @ 1.5 bar |
| Internal Leakage |
2.7 x 10-4 scc/sec
GHe max. @ 1.5 bar |
| Construction |
Body and Magnetic Components |
Stainless Steel 304L/Radiometal 4550 |
| Seal |
Silicone Rubber |
| Mechanical Interface |
Inlet |
7/16-20 UNJF-3A
37° STD Flare - Male |
| Mounting |
4 off M3 holes
on 23 mm PCD |
| Maximum Length |
52 mm |
| Operating Fluid |
GN2, Xe |
Product History:
The SV14 Cold Gas Thrusters have been designed for use
gaseous Nitrogen and qualified for the CryoSat Earth Explorer
Satellite. The SV14-001 has a thrust level of 40 mN and the
SV14-002 is rated at 10 mN. The SV14 has also been used as
an in-line valve for the qualification of the ROS 2000 Xenon
Flow Control Unit.
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