Fig. 5. Outside view of the reactant supply system. system, but the assembled reactant supply system differs from that of the flight-type fuel cell system as follows: (a) The nitrogen line was employed in order to replace feed gases in the oxygen and hydrogen lines with gaseous nitrogen in emergency and during the suspension of operation for safety. (b) Power-reactor dome regulators were used as pressure regulators in the oxygen and hydrogen lines in place of solenoid valves controlled electrically by signals generated by detecting feed pressures of feed gases. (c) A system that removes water was installed into the condenser, and the double- diaphragm-type pump for circulation of gaseous hydrogen and a mist trap for removing water after the compression of gaseous hydrogen were put into the hydrogen line. This was selected as the system for the removal of water in gaseous hydrogen and the circulation of gaseous hydrogen instead of a bifunctional component that works as a separator as well as a pump. This makes possible operation in a nongravitation environment. (d) A gear pump driven by an air motor was used as the coolant circulation pump instead of a centrifugal pump. (e) The temperature of the coolant was controlled by mixing coolant of relatively high temperature with that of relatively low temperature by use of two pneumatic flow control valves. (3) Control Unit The control unit is used to operate remotely the reactant supply system. An outside view of the control unit is illustrated in Fig. 6. The control unit performs the
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