TM 9-2330-356-14
non-filtered bottom load).
WARNING
DO NOT close needle valve completely. This
will prevent 4-inch control valve from closing
at anytime during bottom load operations.
(h) Close (clockwise) needle valve in -turn
increments. Observe change in pressure reading at each
step, until there is no change in pressure.
(i) At this point, open precheck valve D
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(f) Using a 4-inch long screwdriver
turns to open needle valve on 4-inch control valve.
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(j) Sound of control valve starting to close
should be heard in approximately 30 seconds. Full shut off
should be obtained in an additional 35 seconds.
(k) If full shut off is not obtained (sound of
liquid flow or whistle are indications) open (counterclock-
wise) needle valve in -turn increments until it does.
Then close precheck valve, allowing flow to resume.
NOTE
Closing needle valve increases closing
time.
Opening needle valve decreases closing
time.
(1) Repeat steps (h), (i), and (j), changing
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needle valve setting in -turn or less increments until the
3-5 second closing rate is obtained.
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