Valcor Engineering Corporation

Missiles & Space Fill and Drain (Service) Valves


Customizable metal-seated fill and drain valves are designed to maintain extremely low internal and external leak rates of 1×10-6 sccs GHe, and are capable of very high operational cycles. Wetted materials are compatible with typical propellants including hydrazine, nitrogen tetroxide, monomethylhydrazine, and ammonia, as well as pressurants like GHe and GN2). A wide range of mounting styles, end connections, body and seal options are available.


These valves are used in space and launch vehicle systems for propellant loading and venting, and pneumatic pressure vessel charging and venting. They are also used in pressurant systems that are part of the Reaction Control Systems (RCS) and Attitude Control Systems (ACS) where high vibration conditions and large temperature extremes are typically found.

Design Features and Benefits

  • Extensive material (body and seal) options
  • Tight external leakage (1 x 10-6 sccs)
  • Tight internal leakage (1 x 10-6 sccs)
  • Triple redundant sealing
  • Flange mounting or tube ends available
  • High capacity and high pressure designs available