 Product
Overview:
The VC04 Ground Half Coupling (GHC) is a generic design
for actuation of the VC03 Fill and Drain Valve.
The unit is manufactured from stainless steel and is designed
for use with liquid propellant or gas across a range of pressures.
Variable thread dimensions to allow differentiation between
valve applications (pressurant, fuel, oxidiser) are available
as options to this design.
The Fill and Drain valve was originally developed to produce
a generic valve capable of sealing all propellant media. The
valve has been selected for use on a number of major International
satellite programmes, employing monopropellant, bipropellant
and electric propulsion systems.
The Fill and Drain valve is operated using a dedicated ground
half coupling (GHC) which is screwed onto the fight half housing
providing series seals to prevent external leakage. The internal
screw mechanism is opened by applying a counter clockwise
rotation to the actuating shaft until fully open as indicated
by the position indicator. After fuelling is complete, the
valve is closed by clockwise rotation. The GHC may then be
removed and the cap fitted and torqued.
Performance Characteristics:
| Operating Media |
GHe, GN2,
Xe, NTO, MMH, N2H4. |
| Operating Pressure |
310 bar (max) |
| Cycle Life |
100 openclose (qual)
100 FH/GHC mate/demate (qual) |
| External Leakage |
< 1 x 10-6 scc/sec
GHe |
| Internal Leakage |
< 1 x 10-4 scc/sec
GHe |
| Mass (incl. covers and caps) |
< 420g |
| Materials |
Titanium alloy, Stainless steel, PTFE |
| Interfaces |
AN hose connection |
| Maximum Length (incl. covers and caps) |
113 mm |
| Maximum Width |
26 mm |
Product History:
This component has been used (GSE only) on the Artemis
program. It is also scheduled for use on the Smart-1, Rosetta,
Eurostar and Spacebus programs.
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