An improved pneumatic valve and a missile with an improved thrust directional
valve. In one embodiment, a refractory material lining for a pneumatic valve enables
better valve operation and better valve performance. A thin-wall cylindrical sleeve
of rhenium or other suitable refractory metal is located inside a cylinder. A valve
piston may then travel within the refractory sleeve with greater reliability and
better operation. The refractory sleeve cylinder lining can be subject to high
temperatures at a rapid rate and remain operational. Under such a hostile environmental,
including corrosive/erosive environments created by the passage of hot propellant
gasses, the refractory cylinder sleeve has a more reliable operational life and
is lighter in weight than conventional valves made entirely of refractory metals.
