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Fill, Drain
and Vent Valves

Close Overview Flow Control Valve Pyrotechnic Valve Latch Valve Fill and Drain Valves Ground Half Coupling Xenon Regulator

 

Fill, Drain & Vent Valves for Spacecraft Propulsion Systems

For propellants, pressurants and high pressure gases. Also ground half couplings.

 

Fill and Drain / Vent valves
Fill and Drain / Vent valves
 

Range of FDV Valves

Our wide range of Fill and Drain / Vent valves (FDV) are typically used for the loading and venting functions of all kinds of propellants, pressurants and propellant vapours.

 

All valves in the range are space qualified and fulfill the requirements for either two or three mechanical inhibits against leakage . The valves can also be used for test port functions.

 

 

Valve Types

Six different valves types are available, each providing a different interface to prevent misconnection at spacecraft level. These types differ mainly in thread size and orientation.

 

Propellant loading and venting valves are designed to provide three independent inhibits, while gas type or test port valves provide 2 independent inhibits.

 

Propellant and test port FDV's provide excellent compatibility with storable propellants such as MMH, Hydrazine, MON- 1 as well as MON-3.

 

Special high pressure gas type FDV's are available for operation with Helium (He) and Xenon (Xe). In general all types are compatible with standard test agents (IPA / HFE 7100 / deionized water) and gases (He, N2).

 

 

Design Features

The following design attributes and features are common to all six types of FDV :

 

 

 

Fill and Drain / Vent valves Ground Half Coupling
Ground Half Coupling
 

Ground Half Coupling

For servicing, a dedicated Ground Half Coupling (GHC) is required. For each FDV type there is a respective GHC permitting only mating of the correct type. By this means a safe and easy to handle, leak-tight connection between the propulsion system and the ground support equeipmnt is guaranteed.

 

Each GHC provides a robust specific opening / closing mechanism to safely operate the FDV. No specific tooling is required.

 

 

Main Features

 

 

 

Integrated fill and drain valves
Integrated fill and drain valves

 

 

FDV Valve Characteristics

The characteristics of each off-the-shelf fill, drain and vent valve is shown below:

 

 

Fuel Fill Valve
Operating Media
Monomethyl Hydrazine (MMH)
Mass
< 0.07 kg
Total Length
115 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02mm
5.58 + 0.11 mm
Tube Length
61 mm
Adapter Thread
9/16" - 18 UNJF - 3A - RH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

Fuel Vent Valve
Operating Media
Monomethyl Hydrazine (MMH)
Mass
< 0.07 kg
Total Length
112.5 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02mm
5.58 + 0.11 mm
Tube Length
61 mm
Adapter Thread
7/16" - 20 UNJF - 3A - RH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

Oxidiser Fill Valve
Operating Media
Nitrogen Tetroxide (MON)
Mass
< 0.07 kg
Total Length
115 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02mm
5.58 + 0.11 mm
Tube Length
61 mm
Adapter Thread
9/16" - 18 UNJF - 3A - LH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

Oxidiser Vent Valve
Operating Media
Nitrogen Tetroxide (MON)
Mass
< 0.07 kg
Total Length
112.5 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02mm
5.58 + 0.11 mm
Tube Length
61 mm
Adapter Thread
7/16" - 20 UNJF - 3A - LH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

High Pressure Helium Valve
Operating Media
Helium (High Pressure)
Mass
< 0.07 kg
Total Length
112.5 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02 mm
4.9 + 0.1 mm
Tube Length
61 mm
Adapter Thread
M 12 x 1.5 - RH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

High Pressure Xenon Valve
Operating Media
Xenon (High Pressure)
Mass
<= 0.06 kg
Total Length
115 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter

6.4 ± 0.02 mm
4,9 + 0.1 mm
Tube Length
61 mm
Adapter Thread
M 14 x 1.5 - RH. Requires
corresponding ground half coupling
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/sec GHe
< 2.8x10-4 scc/sec GHe

 

 

 

Fill & Drain Valves
2 Failure Tolerant (3 inhibits against external leakage)
Operating Media
Various fluids
(Propellants and Pressurants)
Mass
< 0.09 kg
Total Length
109 ± 1 mm
Standard Tube Dimensions
- outer diameter
- inner diameter
- inner diameter (at weld i/f)

6.4 ± 0.02mm
4.9 + 0.01mm
5.58 ± 0.02mm
Tube Length
43 mm
Adapter Thread
Fuel Loading 9/16" - 18 UNJF - 3A - RH.
Fuel Venting 7/16" - 20 UNJF - 3A - RH.
Ox Loading 9/16" - 18 UNJF - 3A - LH.
Ox Venting 7/16" - 20 UNJF - 3A - LH.

Note: All of the above threads require
corresponding ground half couplings
Life
- Operational Life
- Storage Life

About 16 years
Up to 5 years in a protected environment
Open/Close Cycles
40 Cycles
Standard Operating Temp.
243 to 353 K
MEOP
- Fuel / Ox Loading / Venting

Up to 33 bar
Burst pressure
1240 bar
Leakage
- external Leakage
- internal Leakage

< 1x10-6 scc/s GHe
< 2.8x10-4 scc/s GHe
Sinusoidal Vibration
Up to 20 g
Random Vibration
Up to 5 g²/Hz (56.3g RMS)
Pyrotechnic Shock
Up to 3250 g
All European
Yes

 

 

Heritage

Since their original qualification in 1983, thousands of fill, drain and vent valves have been produced and delivered for a variety of spacecraft programmes including Eutelsat W3A, Amazonas, Inmarsat 4 F1, Anik F3, Skynet 5A, Skynet 5B, Amos 2, Astar, Star 1, Galaxy 17, Hispasat, MSG-4, Microsats, Herschel Planck, Pleiades, Spacebus, Eurostar communication satellites, Mars Express, Venus Express and ESA's Automated Transfer Vehicle.

Fluidic Equipment Brochure (pdf)
Fluidic Equipment
(PDF Brochure)

Fluidic Equipment Brochure  (pdf)

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