AMS Magnet External Valves and Bursting Discs

1
AMS Magnet External Valves and Bursting Discs

• Richard McMahon Space Cryomagnetics

2
Introduction

• Gas Pressure System.
• Other Valves/Components.

3
(No Transcript)
4
Marotta
Hoerbiger
WEKA
MOOG
Fike
VAT
Swagelok
Arde
5
Gas Pressure System
To provide 6 bar helium gas for actuating the
cryogenic valves and current lead disconnect.
6
Gas delivery
Usable gas in bottle is 207 grams min. Top
up/Filling to be carried out before launch. Gas
purity to be 99.9999. A disconnect or cryovalve
operation uses approximately the same quantity of
gas. Sufficient gas planned for 82 operations.
7
Composite over-wrapped pressure vessel
Arde gas bottle 8.3 litre volume. Filled with
200 bar helium (temp excursions can raise this to
273 bar) Total number of actuations (at 6 bar) 82
300 bar burst disc protects the
vessel Qualification burst (prior experience 938
bar)
8
Gas Regulation
Marotta proposal is based around existing flight
hardware.
Fill Drain Valve Operated by dedicated ground
half coupling. 2 metal seals and an o-ring seal
in series. Leakage 1x10-6 mbar-l/s.
Regulator RV29 Extensive aerospace heritage.
Similar Marotta regulator currently in use on the
space station. 6 bar lockup downstream. 15 bar
min upstream pressure. Leakage 1x10-4 mbar-l/s
Relief valve Based on series in aerospace
use. Full Flow _at_ 8 bar. Re-seat _at_ 6.5
bar. Leakage 1x10-4 mbar-l/s.
9
Manifolded Assembly
Preliminary manifold design. Mass 2.72 kg
10
On/Off and Pilot Valves
11
MOOG latching Valve
Flow Diameter 3.175mm Mass lt 140 grams
each Voltage 24 V Type latching Power 11 watts
(50 msecs _at_ 24 volts) Leakage across seat lt
1x10-4 mbar-l/s
12
Hoerbiger Piezo Electric Latching Valve
Mass lt 80 grams per valve. 13 valves in
total. Voltage 24 V. Power 6 mW (while
latching). Operation latching 3 way
valve. Tested using cryovalve test rig.
13
Gas System Outstanding Questions
Determine location of all components around
AMS. Route pipework. Integration of vacuum case
with USS Mechanical fixing of all items. Place
orders with component manufacturers.
14
Other External Valves/Components
WEKA
MOOG
Fike
Swagelok
VAT
15
Fike bursting discs
Fike
16

• Bursting Discs - Fike

The same manufacturer that has produced cold
bursting discs is being used. Pre-qualification
cold discs have gone through testing programme
successfully.
BD14, BD15, BD16 BD17 are being developed by
Fike at the moment. The nine other bursting disc
designs are completed and awaiting order.
17
(No Transcript)
18
MOOG Valve
MOOG
19
MOOG Service Valve
Ensuring vacuum between BD07 bursting
discs. Double redundant seals Leak Rate 1.0x10-6
mbar-l/s _at_ 300 bar Mass lt 154 grams
20
WEKA Warm Valves
WEKA
21
Weka warm valves
Weka have produced cryogenic valves for AMS. Warm
valves still under development. 16 valves
required for flight system. SCL awaiting
dimensions and performance spec.
22
VAT Valves
VAT
23
VAT valves
Butterfly valve type 100 mm ID Protected by 0.8
bar burst disc Leakage 1x10-9 mbar-l/s Proof
pressure TBD during testing. Aluminium body Mass
3.3 kg.
Gate valve 40 mm ID Leakage 1x10-9 mbar-l/s Mass
1.5 kg.
24
Swagelok Valves
Swagelok
25
Swagelok valves
Bellows sealed vacuum valves. Leakage lt 1x10-8
mbar-l/s. Experience using this valve type at
Space Cryomagnetics. Lightest valve type for this
application
26
External Valves - Outstanding Work

• Details of the WEKA valves.
• Definition of all pipework and mechanical
  support.
• Vibration and pressure testing of VAT, Swagelok
  and WEKA valves.
• Definition of all required qual testing.

27
Conclusions

• All gas system and external valves identified.
• Work ongoing to determine physical location and
  fixing method for all components.
• Details of WEKA valve required before pipework
  and fixings design can be completed.