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B-701964-00 Rev. C
Theory of Operation
2-3
Companion 1000/T Liquid Oxygen System Technical Manual
2.1.3
Warming Coil
The warming coil (Figure 2-4) acts as a heat exchanger that transfers heat from the
surrounding atmosphere to the fluid inside the coil. This action vaporizes the liquid
oxygen and warms the resulting gaseous oxygen for breathing. The warming coil on the
Companion 1000 is a series of 3/16 in. wound-aluminum tubing that connects between
the flow control valve and the manifold. The warming coil on the Companion T
consists of two sections of 3/16-in. wound-aluminum tubing and a section of spined
aluminum tubing. The spined tubing enhances the heat transfer characteristics of the
system. This is essential to the operation of the Companion T due to the higher flow
capability (15 L/min) of the unit.
Figure 2-4: Warming Coil
2.1.4
Flow Control Valve
The flow control valve (Figure 2-5) is a rotary, fixed-orifice device consisting of a
moveable rotor with 11 individually sized orifices. When you select a specific flow rate
on the flow control valve, the corresponding orifice aligns between the inlet and outlet
ports of the valve. The calibrated orifice delivers the selected flow when gaseous oxygen
at 22 psig (152 kPa) is present at the valve inlet port. The standard Companion 1000
flow control valve has a flow range of 0 to 6 L/min, and an optional valve is available
with a flow range of 0 to 4 L/min. The Companion T flow control valve has a flow
range of 0 to 15 L/min.
Figure 2-5: Flow Control Valve
Inlet
Orifice
Outlet
Summary of Contents for COMPANION 1000
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