Brooks Instrument 1355 - Manual (Page 22)

4-2
Models 1350E and 1355E
Section 4 Maintenance Installation and Operation Manual
X-VA-1350E-eng
Part Number: 541B082AHG
August, 2012
4-2 Reassembly Procedure
a. Use the reverse of Steps a through f of the disassembly procedure to
reassemble the meter.
b. Prior to installing the needle control valve assembly make certain that the
valve stem is turned completely counterclockwise (full open position) to
prevent damage to the valve seat. Packing seats should be examined for
damage or deterioration and replaced if necessary.
c. When replacing the packing seats in the flowmeter body be sure the packing
inserts are approximately 1/16" above the top of the packing seat. Also be
certain the tube seats firmly on the packing seats and does not overlap onto
the end block.
d. The seal spindle serves to axially compress the tube seat gasket and exert a
uniform pressure on the metering tube to prevent any possibility of leakage.
Do not overtighten the seal spindle.
e. After the flowmeter has been reassembled, it is important that it be leak
tested with air at a minimum pressure of 15 psig at room temperature.
To detect leaks, brush soapy water around all possible leak points (tube
packing, connections, and seal spindle) and check if bubbles are being
formed. Should a leak be detected, tighten that particular joint to see if the
leak can be stopped. If the leak persists, disassemble the area involved and
check for dirt or damaged elastomer. Clean and replace elastomer.