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Bradley Corporation • 215-1289 Rev. H; EN 06-909
1/29/07
Thermostatic Mixing Valve Maintenance
For maximum efficiency, your thermostatic mixing valve requires a minimum amount of maintenance.
Follow the procedures outlined below to achieve highest performance.
WARNING: To prevent injuries, use proper protective equipment for eyes and skin
when using a propane torch.
Check the piston for smooth movement
To check the valve's piston for free and smooth movement,
follow the procedures outlined below.
1. Remove the valve's top cap and pull out the push rod and
then the thermostat (see Figure 5). You may use a needle-
nose pliers to remove the thermostat from the valve body if
desired.
2. Insert a 7/16" dia. rod into the valve and into the piston
overheat chamber. Mark the length of the rod inside the
valve (see Figure 6).
3. Push the rod until the piston stops and mark the new length
(the new length should be approximately 1/2" longer than
the original length) (see Figure 6). If the length is not as it
should be, the piston is not moving freely and needs to be
cleaned along with the piston liner. Clean the piston and
liner following the method outlined below:
• remove the control section assembly from the valve body
• remove the top cap and thermostat
• unthread the liner from the cap (it is glued together; the
o-rings must be removed and a propane torch must be
used to melt the glue and loosen the liner)
• any cleaner suitable for brass and stainless steel may be
used (if cleaning with suitable cleaner is not sufficient to
remove debris, a 400-grit sandpaper may be used to polish
and hone the piston and liner).
4. If the piston moves freely, push the mechanism up and
down several times to make sure the piston moves
smoothly and consistently. If movement of the piston is
not consistent, recheck the piston and liner for dirt and
debris as described in procedure #3.
• if the piston parts need to be replaced, contact your
Bradley representative and ask for Piston/Liner Kit
(part number S65-180).
THERMOSTAT
Figure 5
TOP CAP
w/PUSHROD
7/16"
ROD
The second mark
should be 1/2" higher
on the rod than the
first mark.
Figure 6
PISTON
OVERHEAT
CHAMBER
Bradley EFX 60 Thermostatic Mixing Valve with Optional Cabinet
Installation and Maintenance Instructions
Model S19-2200 Series
