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ID
19
OPERATION
No.
ID
39 1
- 6 : Overhauling
a pressure regulator
Op.ID
391-6
197
8
Fit
a ring
seal
(13)
after
first
being
smeared
with
fluid,
on
the
piston
(2)
(cone
2226-T,
see
P1.89,
fig.
12)
Immerse
the
piston
in
the
fluid
and
fit
it
in
the
cylinder.
Make
sure
that
the
piston
slides
freely
in
the
cylinder
. . . .
9
Place
a new
ball
(4)
on
the
valve
seat.
Determine
the
number
of adjusting
shims
(1)
to be
placed
under
the
plate
(3).
Make
sure
that
the
face
"d"
of the
body
of
the
control
valve
is
free
from
burrs
or
dents.
Place
in
position
a straight-edge
MR-3377
( see
Pl.
13,
fig.
3) together
with
a dial
gauge
on
which
the
pointer
has
been
replaced
by
the
extension
2438-T
(see
P1.51,
fig.2)
SO that
the
straight-edge
rests
on the
face
"d"
and
the
extension
isin
contact
with
the
ball
(4).
Use
the
straight-edge
and
gauge
only
on
the
dry
parts
(ball
and
seat).
Set
the
dial
gauge
at
zero.
Note
the
position
of the
totalising
needle.
Place
the
straight-edge
so
that
the
extension
is
at the
point
of
contact
between
the
bearing
face
"e"
of
the
shim
(1)
on
the
body
of the
control
valve.
Take
the
difference
between
the
two
readings,
for
example
a projection
of
the
body
with
respect
to
the
ball
of
0.1
mm.
Knowing
that
the
clearance
"a"
must
be
between
0.3
and
0.4
mm
a
shim
(1)
0.20
mm
thick,
must
therefore
be
fitted.
To
make
sure
that
this
shim
still
enables
the
plate
(3)
to
be
fitted
in
the
proper
position
proceed
as
follows:
Mark
the
position
of
the
edge
of the
seat
"b"
with
respect
to
the
bearing
face
"e"
of
the
washers
on
the
body.
Place
the
straight-edge
on
the
control
valve,
with
the
extension
in
contact
with
the
bearing
face
"e"
of the
shim
(1).
Set
the
dial
gauge
at
zero.
Place
the
straight
edge
so that
the
extension
is
in
contact
with
the
edge
of
the
seat
"b".
Take
the
difference
between
this
and
the
previous
reading.
In
the
case
of
the
above
mentioned
example
the
seat
must
project
more
than
0.20
mm
beyond
the
body,
if not
the
plate
will
not
be
parallel
with
the
body.
Use
a shim
(1)
of
another
thickness
in
order
to
remain
within
the
limits
of
tolerance
(clearance
"a"
between
0.3
and
0.4
mm).
Place
the
shim
(1)
and
the
plate
(3)
in
position
and
tighten
the
screw
. . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
11
Check
the
tightening
torsion
of
the
nut
(14)
of the
cylinder,
21.6
ft.lbs
(3
m.
kg)
. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Place
the
thrust
cup
(10)
complete
with
ball
in
the
body
of the
control
valve.
Make
sure
that
the
piston
is
sufficiently
withdrawn
to
enable
the
ball
to
fit
on
its
seat.
NOTE
- The
cup
must
not
be
fitted
undrilled.
Place
the
seal
(11)
in
the
body
of the
regulator.
Fit
the
spring
(8).
Place
the
adjusting
washer
(9)
in the
cap.
Holding
the
regulator
with
the
pin
(A)
as
shown
in
paragraph
4,
place
the
spanner
(B)
in
position
on the
cap.
Using
a press,
compensate
the
thrust
of
the
spring
and
engage
the
first
threads
of
the
cap
on
the
control
valve
without
forcing.
Screw
up
and
follow
the
cap
with
the
press
(spanner
and
spindle
2224-T,
see
P1.87,
fig.
2).
If
the
force
exerted
by
the
press
is
correct,
the
nut
will
rotate
easily.
TOOLS
Cone
2226-T
Dial
gauge
2437-T
Straight-edge
MR-3377
Extension
2438-T
24 mm
socket
extension
Torsion
spanner
2471-T
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