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Propellant
Management Devices (PMDs) operate on the principle that once a
material containing fine pores or openings is wetted with a
liquid, it will allow free flow of the liquid but will resist
flow of a gas. The resistance to gas flow is a function of the
size of the opening and the surface tension of the liquid. PMDs
are superior to pressurized bladder means of controlling fuel
flow in that they are contaminant free and have indefinite
storage life. Surface tension devices are used to control the
flow of liquids from storage tanks of space vehicles operating
under zero gravity where gas pressure is used to displace the
liquid from the tank. They are also used in liquid systems where
undesirable gas bubbles may form due to progressive breakdown of
the liquid itself.
WINTEC is a leading supplier of
PMDs to DOD, NASA prime contractors, and commercial satellite
programs. WINTEC has years of experience welding thin sheets and
foils of exotic and dissimilar metals to fine wire mesh.
