The Cobham Satellite Propulsion Regulator (part number B40351-1)
is used to pressurize the bipropellant tanks of communications
satellite propulsion systems.
The regulator is arranged in a series redundant configuration to
ensure continued system function should either of the
redundant regulator pair fail open.
This arrangement is dictated by the application for which high
operational reliability is required. This regulator is configured
with metal to metal seats in both stages in order to tolerate
upstream migration of N2O4 or N2H4 vapors. In the absence of
such vapors, a metal to Vespel seat can be used in the upstream
regulator to improve internal leakage performance.
Extremely good external leakage performance is achieved by
employing welded closures throughout the gas flow path. The
low weight of the regulator stems from the use of a
lightweight composite helical/Belleville spring system and a
machined titanium housing.