Manual

4-3
Section 4 Maintenance
Models MT 3809 and 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
meter inlet.
3. Loosen the float assembly with two screwdrivers one on each end of
the meter and turn to loosen the inlet and outlet screws (#2). Remove
inlet screw (#2) at the bottom of the meter.
4. Remove the guide vane (#3) at the bottom of the meter and gently push
the float assembly up and out the top/outlet side.
5. Reassemble by inserting the float assembly into the top of the meter.
Replace the guide vane (#3) and secure the float assembly by
tightening the inlet and outlet screws (#2). Replace the spiral retaining
ring (#1) in the meter inlet.
c. Size 8 (1/2") Flanged Gas Service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. With the help of a small screwdriver remove the spiral retaining ring
(#1) from the meter inlet.
3. Secure the damper from turning by inserting a 1/8” pin through the top
guide cartridge. While holding the damper in place, remove the top/
outlet screw (#5).
4. Push the float assembly out through the inlet/bottom.
5. To clean the gas damper, unscrew the cylinder head (#6). Then remove
the bolt (#7) and carefully take out the small piston so as to not damage
the critical surfaces.
6. Reassemble the meter by assembling the damper with float assembly.
Insert the float assembly with damper into the inlet/bottom of the meter.
Secure the inlet/bottom screw. While holding the damper in place with a
pin (1/8” diameter), insert and secure the top/outlet screw (#5). Replace
the spiral retaining ring (#1).
d. Sizes 10 (1"), 12 (1 1/2"), 13 (2") Flanged Liquid Service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Loosen the float assembly with two screwdrivers one on each end of
the meter and turn to loosen the inlet and outlet screws (#2).
3. Remove inlet screw (#2) at the bottom of the meter.
4. Remove the guide vane (#3) at the bottom of the meter and gently push
the float assembly up and out the top/outlet side.
5. Reassemble by inserting the float assembly into the top of the meter.
Replace the guide vane (#3) and secure the float assembly by
tightening the inlet and outlet screws (#2).
e. Sizes 10 (1"), 12 (1 1/2"), 13 (2") Flanged Gas Service
1. With the help of a small screwdriver remove the spiral retaining ring
(# 1) from the meter inlet.
2. Secure the damper from turning by inserting a 1/8” pin through the top
guide cartridge. While holding the damper in place, remove the top/