Dwyer TVF - Manual (Page 5)

ASSEMBLY
Replace all parts in reverse order of disassembly. Note the small
key on the core tube that must be aligned with a corresponding
keyway in the meter body. Seat the O-ring on the sight tube
before assembly. Lubricate the O-ring with a small amount of
service compatible silicone grease or petroleum jelly to facilitate
replacement.
After replacing the internals, using hands only, press the sight
tube firmly down into the meter body with a twisting motion. Be
careful not to rock the sight tube side to side and bend the
snorkel tube/guide inward where it might interfere with float
movement. Rotate sight tube as necessary for scale visibility
and/or alignment of slots for lock ring tabs. Reinsert lock rings
and cotter pins, lower flange and snap ring (be sure snap ring
engages groove in body), or flange bolts (do not over tighten).
If reassembled correctly, the top edge of the indicator disk should
line up with the scale “zero”. If it does not, disassemble the meter
completely and carefully reassemble it, making sure core tube is
completely seated in the body.
REPLACEMENT PARTS
Parts only need to be replaced if damaged. Any visible damage
to the entire surface of the O-ring or sight tube (particularly from
the bottom edge) indicates need for replacement. To insure
accuracy, the inside surface of the meter core tube, slot edges,
and OD of the float piston should be free of nicks, chips, with no
visible erosion of any surfaces.
STORAGE REQUIREMENTS
There are no special requirements for Series TVF flowmeters
and parts. They should be kept in a reasonably clean location
away from excessive heat (over 120°F, 48ºC.) or chemical or
solvent fumes and vapors.
MAINTENANCE
Upon final installation of the Series TVF Flowmeters, no routine
maintenance is required. A periodic check of the system
calibration is recommended. The Series TVF Flowmeters are not
field serviceable and should be returned if repair is needed (field
repair should not be attempted and may void warranty). Be sure
to include a brief description of the problem plus any relevant
application notes. Contact customer service to receive a return
good authorization number before shipping.