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.
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 thermostat (see Figure 5).
2. Push down on the pushrod (the pushrod should move
approximately 3/8") (see Figure 6). If the movement 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 top cap and thermostat
• using a 15/16" socket wrench, loosen the liner from the
valve body and lift the liner out with a needle-nose pliers
• disassemble the piston assembly components as shown in
Figure 7 (use a 1/2" deep-well socket to remove the upper
seat)
• 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)
• reassemble the piston assembly components and retest the piston.
3. 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 #2.
• if the piston parts need to be replaced, contact your Bradley representative and ask for Piston/Liner
Kit (part number S65-172).
Bradley EFX 8 Thermostatic Mixing Valve with Optional Cabinet
Installation and Maintenance Instructions
Model S19-2000 Series
7
Bradley Corporation • 215-1291 Rev. L; EN 07-903A
5/14/08
THERMOSTAT
TOP CAP
Figure 6
PUSHROD
(should move
approx. 3/8")
Figure 7
Figure 5
S19-2000
S19-2000
