Neptune TRU/FLO, Installation And Maintenance Manual

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Appendix C
40 TRU/FLO Compound Meter Installation and Maintenance Guide
Performing Maintenance on the Throttle Valve
Complete the following steps.
Figure 60 Throttle Valve
1 Perform a visual inspection of the throttle valve.
The valve should open to approximately a 45-degree angle and
close freely. See Figure 61.
Figure 61 Throttle Valve Angle
2 If maintenance is required, the valve can be replaced by removing
the two flathead screws on the side of the valve.
3 It is possible that the entire throttle valve needs to be replaced. In
that case, the throttle valve door fits into the throttle valve with two
snaps.
Figure 62 Removing the Throttle Valve.
The throttle valve is located on the cover of the meter.
See Figure 61.
A failed low flow test can be an indication that the throttle valve
needs to be replaced.
Screws
Maintenance on the turbine and disc side of the meter is
accomplished in the same manner shown previously in this
document for the 3-inch, 4-inch and 6-inch meters.