Cobham service valves are used to load, drain and vent spacecraft propellants, liquids and gases while preventing leakage.

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Cobham Service Valves trace their heritage back to 1975 with the start of the Viking program.


Over 150 service valve variants have been produced and flown on various satellites, space probes and classified missions. Many types of service valves are available to meet specific needs.


Changing the material properties allows the valves to function in different operating conditions.


Key Features

  • "Metal to Metal" primary seal
  • Redundant seals with THIRD SEAL (Tertiary Cap) available
  • Over 150 variants designed, qualified, produced and flown on
  • satellites, space probes, and launch vehicles
  • Service pressure up to 10,000 psig available
  • Seat leakage < 1 x10-6 SCCS GHe



Valve Types Service, Fill/Drain, Fill/Vent
Body Materials Stainless Steel, Titanium
Size 1/4" (0.635 cm) 3/8" (0.953 cm) 1/2" (1.27 cm)
Service Options Anhydrous Ammonia, Argon, Deionized Water,

Distilled Water, Fluorinert FC-77, Freon 113,

Gelled IRFNA, Hydrogen, Hydrazine,

Isopropanol, MMH, Monomethylhydrazide,

Nitrogen Tetroxide, Xenon,

Unsymmetric Dimethyl Hydrazine

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