3.10.3 Bronze Liner
The Autoflame feed water control valves have been modified to include bronze liners. The liners have
been incorporated within the design of the valve to assist with applications where the supply feed
water is high in particulate, which can lead to premature valve failure. This is particularly applicable
where feed water is insufficiently filtered.
The liners have been designed to be easily replaced for general maintenance and service. The sizing
table shows the valves available and the operating pressure requirements. It is important that the
maximum stated differential pressure across the valve should not be exceeded. The differential
pressure across the valve has a direct relationship to the velocity of the water through the valve.
Excessive velocity will lead to premature failure of the bronze liner.
There has also been the addition of high temperature bearings to hold the bobbin central in the valve;
these are in the top and bottom plate. The higher velocities will not have as great an impact on the
bronze liner as the PTFE liner. However if the valve only operates at the very low end, there will be
long term wear of the liner edge. The valve should be sized from the tables in this section 3.10.5, not
from the supply pipe size.
3.10.4 Replacing the bronze liner
When replacing the bronze liner in the valve make sure this is done in a clear area to avoid debris
from entering the valve. Make sure the liner is placed on the feed water valve bobbin before inserting
into the valve body. When the new liner and bobbin is re-assembled into the valve body ensure the
constellations are in line with the machined pockets in the bottom plate, also ensure that the liner is in
the correct orientation to the valve body as this can be installed 90 degrees out from the ports on the
valve. It is not necessary to remove the entire valve from the pipe work but it is essential that the valve
is sufficiently isolated and cooled before work begins.
Figure 3.10.4 Bronze Liner
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