21
Disassemble
the
mixing
valve
in
a
front
to
back
sequence.
Start
at
the
temperature
control
lever
and
work
towards
the
base.
1. Shut
off
the
steam
and
water
supplies.
2. Open
the
outlet
shut-off
valve
and
hose
nozzle
(if
equipped)
to
relieve
pressure.
3. Remove
the
temperature
regulating
lever
by
unscrewing
the
retaining
screw
and
washer
(these
items
may
have
been
previously
removed
if
temperature
setting
is
locked).
4. Remove
the
gland
plate
screws
and
gland
plate.
5. Sequentially
remove
the
six
retaining
screws
from
the
spring
loaded
bonnet.
Maintain
pressure
against
the
bonnet
while
disassembling.
6. Remove
the
bonnet
and
spindle
assembly.
7. Unscrew
the
spindle
in
a
clockwise
direction
and
remove
from
the
bonnet.
8. Carefully
push
out
the
gland
seal
packing.
9. Carefully
remove
the
spring
and
poppet
valve
from
body.
10. Using
a
36mm
socket
remove
the
diffuser
and
gasket.
11. Inspect
the
condition
of
the
diffuser
seat
and
replace
if
damaged.
The
diffuser
may
be
de-scaled
using
a
commercial
inhibited
descalent.
Caution:
Do
Not
twist
the
poppet
when
removing
or
damage
to
the
diaphragm
may
occur.
Note:
Replace
the
poppet
valve
and
spring
as
a
single
unit
when
damaged.
This
completes
the
disassembly
of
the
upper
section
of
the
Mixing
Valve.
To
clean
or
inspect
the
lower
section
of
the
Mixing
Valve
or
if
the
Diaphragm
requires
replacement
continue
with
the
disassembly
procedure
in
the
next
section
(Diaphragm
Replacement).
Replace
worn
or
damaged
parts
as
required.
Always
replace
"
O
"
rings
and
gaskets
with
new
ones
after
disassembly.
(Use
Service
Pack
#203-937-52.)
Diaphragm
Replacement
1. When
replacing
the
diaphragm
it
is
considered
good
maintenance
practice
to
check
over/audit
the
complete
Mixing
Valve.
2. To
replace
the
diaphragm
disconnect
the
Mixing
Valve
from
the
pipework.
3. Using
a
diagonal
sequence
remove
the
eight
valve
body
retaining
screws.
4. Carefully
separate
the
base
from
the
body.
Be
careful
not
to
lose
the
connecting
tube
and
"
O
"
ring.
5. Withdraw
the
diaphragm
assembly
and
inspect
for
damage.
Replace
if
necessary.
6. If
desired,
the
base,
valve
body
and
diaphragm
piston
may
be
descaled.
Do
not
allow
descaler
to
come
in
contact
with
the
diaphragm.
Caution:
Use
only
silicone
based
lubricants
when
assembling
the
mixing
valve.
7. Re-assemble
in
the
reverse
order.
Ensure
that
both
the
base
"
O
"
ring
and
the
connecting
tube
and
the
connecting
tube
"
O
"
ring
seat
properly.
Tighten
screws
diagonally
opposite.
Press
the
triangular
spindle
that
is
visible
in
the
top
of
the
valve
body
to
check
for
free
and
even
movement
of
the
diaphragm
assembly.
