PCI 793080-002, Руководство пользователя

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MOST 20-2B
10
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
i. Check that the burst disk protective covers are in
place.
j. Check the vent valve for smoothness of operation.
Check that the handle is not loose.
5-6 TESTING OF THE FLOW
CONTROL VALVE
Note:
The flow control valve delivery rates cannot be
adjusted but the rates can be verified for accuracy.
To verify the flow control valve rates perform the
following procedures.
a. Fill a MOST 20-2B to the proper pressure or use an
already filled unit. Optionally follow the instructions
in step (i).
WARNING:
The sequence in steps (b.) through
(d.) must be followed to preclude release of oxygen
at pressure from an unrestricted hose outlet.
b. Assemble a tee fitting between a supply hose outlet
and a flow control valve. Add a master gauge with a
0-100 psig range to the tee fitting.
c. Using a short piece of tubing, connect a rotameter
capable of reading from 0 to 20 liters per minute
(LPM) to the valve outlet.
d. Set the flow control valve to the “0” flow rate
position.
e. Insert the supply hose male quick disconnect into
one of the output quick disconnect fittings on the
MOST 20-2B panel.
f. Observe that the master pressure gauge remains
within the 50±5 psig during the gas flow. To adjust
the regulator if it is out of range, open case and turn
the tee handle on top of the regulator (RV-2) until it
is back in range. Close case and continue. NOTE:
The regulated pressure cannot exceed the relief valve
which is set at 60 psi.
g. Set the flow control valve at each of the flow
positions and establish that the rotameter reading is
comparable to the flow tolerances as shown in Table
5-1.
h. Replace any flow control valve that does not
perform to the values in Table 5-1.
i. An alternate test method may be employed by
substituting for the MOST 20-2B a cylinder of
oxygen per MIL-PRF-27210G with a pressure
regulator and gauge in line to the flow control valve
and rotameter.
VALVE POSITION FLOW- SLPM OXYGEN
0 .............................. NO LEAKAGE
2 .............................. 2.35-1.68
4 .............................. 4.59-3.47
6 .............................. 6.88-5.17
8 .............................. 9.17-6.89
10 ............................. 11.47-8.61
15 ............................. 17.21-12.92
Flow Control Valve Flow Rate at 50±5 psig.
Table 5-1