Page 11
MEASURING CHAMBER MAINTENANCE
To Remove and Disassemble Flowmeter Measuring Chamber
This operation is not difficult and may be performed by any competent mechanic. No special
tools are required. No trouble need be expected, if these few simple, but important, directions are
followed. Do not open the flowmeter until you have checked over all other possible causes of erratic
registration.
1. Prepare a clean surface on which to place the parts as they are removed. The parts are
machined to close tolerances and should be handled with care. Have a replacement gasket
ready before opening the flowmeter.
2. Loosen the two clamp screws on the lower front of the register. Lift the register off. On Preset
Models the valve linkage must first be disconnected. (Remove cotter pin and washer at valve
end.)
3. Remove the flowmeter cover taking care not to damage the gasket.
4. Lift the measuring chamber from the flowmeter casing.
5. Remove the upper cylinder head by inserting a screwdriver in one of the slots provided and
prying it off. Be careful not to scratch or nick any part of the chamber.
6. Lift out the piston by its spindle. If care
is taken to draw it straight, it should
come out easily. Do not force it.
7. Remove the control roller and the
diaphragm from the lower cylinder
head.
8. The seal pin may be removed (for
replacement only) by pulling upward,
using pliers if necessary.
Diaphragm, seal pin, and roller are
available as spare parts for rebuilding mea-
suring chamber.
To Clean The Measuring Chamber
The parts may be most easily cleaned of scale, etc., by means of a good, coarse, stiff bristle (not
wire) brush and gasoline. All foreign matter, except deeply embedded chips or heavy corrosion due to
water, may be removed in this manner. Do not use abrasives, such as emery cloth or sandpaper.
The parts of the measuring chamber which may show wear after long periods of service are the
diaphragm and the control roller. These parts will not require replacement until the accuracy begins
to fall off at low rates of flow. To change these parts, merely substitute the new for the old when the
flowmeter has been taken down for cleaning.
Experience has shown that the sliding surfaces between the chamber and piston take on a
burnished finish and wear little if any.
To Reassemble The Chamber In The Flowmeter
Before reassembling the flowmeter, rinse all parts
in gasoline. If possible, flush out the flowmeter body. As-
semble the parts carefully; they should slide together
easily without hammering or forcing. It is essential that
all contact surfaces between the cover and chamber, or
between the measuring chamber and its seat in the cas-
ing, be clean and free from nicks.
1. Assemble diaphragm and seal pin in chamber if
replacement was necessary.
MEASURING CHAMBER
MAINTENANCE
To Remove and
Disassemble Flowmeter
Measuring Chamber
To Clean the Measuring
Chamber
To Reassemble the
Chamber in the
Flowmeter
FIGURE 12
CHECKING THE PISTON MOVEMENT
FIGURE 11
MEASURING CHAMBER COMPONENTS
Summary of Contents for RED SEAL MEASUREMENT neptune
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