Bradley EFX 20/S19-2150 Manuel D'installation page 8

EFX 20/S19-2150
Troubleshooting: Piston Disassembly and Cleaning
WARNING To prevent injuries, use proper protective
equipment for eyes and skin when using a
propane torch.
Remove the valve's top cap and pull out the
A
thermostat. You may use a needle-nose pliers
to remove the thermostat from the valve body if
desired.
Insert a 7/16" dia. rod into the valve until it touches
the top of the pushrod that is attached to the
B
piston Mark the length of the rod inside the valve.
Push the rod until the piston stops and mark the
new length.
If the rod travels less than1/2", the piston is not
moving freely within the liner and they must be
cleaned:
1. Remove the control section assembly, top
cap and thermostat.
2. Unthread the liner from the cap (it is glued
C
together; the o-rings must be removed and
heat should be applied to melt the glue and
loosen the liner).
3. Clean the piston and liner with any cleaner
suitable for brass and stainless steel (400-
grit sandpaper may be used to polish and
hone the piston and liner).
Push the mechanism up and down several
times to make sure the piston moves smoothly
D
and consistently. If it is not consistent, repeat
Procedure C until it moves freely, or replace.
Contact your Bradley representative and ask for
Piston/Liner Kit (part number S65-409).
8 12/7/2017
Top Cap
The second mark
should be 1/2"
7/16"
higher on the rod
Rod
than the first mark.
Bradley • 215-1809 Rev. B; ECN 17-09-009
Installation
Thermostat
Piston Overheat
Chamber