Flow Control Valve; Removal; Backflushing - CAIRE COMPANION 1000 Technical Manual

Companion 1000/T Liquid Oxygen System Technical Manual
5.6

FLOW CONTROL VALVE

5.6.1
5.6.2
B-701964-00 Rev. C
The Companion 1000/T flow control valve is a rotary, fixed-orifice device that consists
of a moveable rotor with 11 individually-sized orifices. The desired flow rate is achieved
when the selected orifice in the rotor is aligned between the inlet and outlet ports of the
valve.
Extreme cold hazard. Liquid oxygen discharge from the flow control
valve can occur if a 0-15 L/min Companion T flow control valve is
installed in a Companion 1000. Always check the flow rating decal on
the flow control valve before installing the valve in a Portable. DO NOT
install a 0-15 L/min valve in a Companion 1000.

Removal

Refer to Figure 6-1 or 6-2 to identify parts with bold number references.
1. Remove the top bezel 11 (Section 5.3.1).
2. Use a 1 / -in. open-end wrench to loosen the
2
flow control valve 30. Remove the tube and nut from the flow control valve.
-in. Allen wrench to loosen the set screw 1 in the flow control valve knob
3. Use a 1 /
16
2. Remove the flow control valve knob and decal 3. If the knob does not use a set
screw, insert the Allen wrench into the hole in the knob. Simultaneously push in and
pull up on the Allen wrench to remove the knob.
4. Use a small flat-blade screwdriver to loosen and remove the two flat-head screws 4
from the flow plate 5. Remove the flow plate and the flow control valve.
5. Use a dental pick or similar tool to carefully remove the inlet filter screen 29 from
the flow control valve. Be careful not to scratch any part of the flow control valve
inlet port when removing the screen (Figure 5-10).
Some flow control valves use an inlet filter screen that cannot be removed. Do
not perform step 5.6.2 if your flow control valve uses this type of screen.
Back-flushing
Perform the following procedure for back-flushing the flow control valve to remove any
debris that may be in the valve orifices. The inlet filter screen must be removed before
performing this procedure.
WARNING
-in. tube nut 27 on the back of the
3 /
16
Figure 5-10
Service and Repair 5-9